ENGLISH-TRANSLATION OF A SOVIET MAINTENCE MANUAL FOR M-46 AND M-47 GUNS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T00246A031200180001-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 552
• Document Creation Date: December 23, 2016
• Document Release Date: September 20, 2013
• Sequence Number: 1
• Publication Date: January 27, 1964
• Content Type: REPORT

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J
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FMATION REPORT' iNFORIAi,IONE oti7:1!
CENTRAL INTELLIGENCE lAtENCY
This material contains information affecting the National Defense' of the United States within the meaning of the Espionage Laws, Title
19, U.S.C. Secs. 793 and 794, the transmission or revelation of which in any manner to an unauthorized person is prohibi
S=E-CR-E-T
? NO FOREIGN DISSEM
COUNTRY USSR
...____ ......._
SUBJECT Eniifih-TFarisiation of a., DATE D STR. 627 January 1964 50X1
. Soviet Maintenance Manual
A
1L!? for M-46 and M-47 Guris 2- NO. PAGES 1
. '7
. REFERENCES
'
REPORT
DATE OF
INFO.
PLACE &
DATE ACQ.
50X1
50X1-HUM
THIS IS UNEVALUATED INFORMATION. SOURCE GRADINGS ARE DEFINITIVE. APPRAISAL OF CONTENVIS TENTATIVE.
1. One copy of an English-translation of a Soviet manual
entitled, Manua: for Maintenance of, M-46 and M-47 Guns
(Rukovodstvo po remontu orudiy M-46 i M-47)
'50X1-HUM
The Russian- 50X1-HUM
language version of the manual, published by the Military
Publishing House of the Ministry of Defense, Moscow,
1958' 50X1-HUM
Part 3 (appendices), consisting of diagrams and tables, is
explained extensively in Parts i and 2 of the text, and with
the exception of titles and headings, has not been
translated. The Russian-language text has been included,
however.
Distribution of Attachment for Retention,:
50X1-HUM
SAC: 1 copy '50X1-HUM
NSA: 1 CODY
00/FDD: -
OSI:
1 copy
1 copy
ORR:
2 copies
Army:
4 copies
Army/FSTC:
6 copies
Navy:
1 copy
Navy/STIC:
1 copy
Air:
1 copy
LA
Air/FTD:
1 copy
2
S-ENO FOREIGN DISS4
-C-R-E-T
L:(0 E Note: Field distribution indicated by "*".) .
00/FDD Army/FSTCNIavy/STIC Air/FTD
I DM AARMYI 1 AM 1 NSA IVCC NICI OCR I SAC
50X1-HUM-
? ? "
INFORMATION REPORT INFORMATION .REPOT?
I '-50X1-HUM
4 1
A
in
t
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50X1-HUM
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MANUAL
FOR MAINTENANCE OF
M-46 and M-47
GUNS
(English Translation)
50X1 -HUM
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Ministry of Defense USSR
Manual '
for Maintenance of
m.-46 and M-47 Guns
Military Publishing House
Ministry of Defense USSR
MOSCOW 1958
50X1-HUM
50X1-HUM
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50X1-HUM
Note to the Translation
Part 3 (appendices), consisting of diagrams and tables
explained extensively in parts 1 and 2 of the text, has
not been translated. However, the complete Russian
copy of this material is provided, and appendix titles
are supplied in English.
50X1-HUM
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List of Changes
iii GOST ZE11-union State Standards7 and OST fAll-Union Stand50X1-HUM
1 / Specified for the Manual
Indicated in .the Manual .
GOST 380 -? 57
GOST 1050 a' 57 '
crosT 1463 7 53
GOST 2523 51
COST 2789 -
GOST 2967 - 45
GOST 4543 - 57
GOST 5047 - 11.9
GOST 64-02 - 52
The text has been deleted and
In Effect at Present
GOST 380 - 60
GOST 1050 -60
GOST 1465 - 59
GOST 9466 - 60
GOST 9467 - 6o
GOST 2789 - 59
GOST 2967 - 52
,GOST 4543 - 61
GOST 9389 6o
GOST 6402 - 61
corrections inserted for technical
reasons on pages: 11, 25, 29,
52,
53, 62, 83, 85, 94, loo, no, 116,
119,
122,
135,
137,
139,
182,
197,
198, 199, 213, 217, 268, 272, 273,
274,
281
282,
2811-,
289,
295,
298,
301, 305,
306,
352,
354,
355,
359,
361, 362,
363,
364,
365,
375,
376,
379, 380,
381,
382,
386,
388,
389,
and 393.
Certified as correct: runreadable7
50X1-HUM
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Table of Contents
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rage
Introductlion 13
Pa,rt One
Maintenance of the Gun
Chapter One. General Maintenance Instructions 14
1. Inspection Instructions 15
2. Dismantling Instructions 18
3. Maintenance and Asseithly Instructions 19
4. Instructions For Chec.king the Gun After Maintenance 24
5. Instructions For Correction of General refects 25
Chapter Two. Maintenance ,of the Barrel... 29
1. Elongation of Breech Cha.mber....
OOOOO OOOOOOOOO 29
7
2. Copper Fouling of the Bore 29
3. Bent Barrel 29
4. Expansion of the Bore. 30
5. Dents on the Outer Surface of the Barrel 31
6. Cracks on the Surface of the Bore 31
7. Holes in the Barrel ? 32
8. Nicks and Scratches on the Clinometer Plane 34
9. Rust on the Adjoining Surfaces of the Barrel Jacket
and. the Barrel Tube 35
10. Turning of Muzzle 'Brake 01-51 or 01-45
35
11. Muzzle Brake Will Not Screw Off the Barrel Tube 36
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12. Dents and' Cracks in Muzzle Brake 01-51 or 01-45
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13. Wear of Guide 01-12 of the Barrel Ring and. Guide 50X1 -HUM
01-52 of the Breech Ring 36
14. Looseness of Lock 01-17 of the Breech Ring Causing
Breech Ring to Turn on Jacket 01-12 42
Chapter Three. Maintenance of the Breechblock 43
1. The Breechblock is Not Secure in the Closed
Position 43
2. The Breechblock Does Not Open 43
3. Projectile Retainer 02-38A (02-38) Does Not Go Into
The Working (Upper) Position 47
4. The Breechblock Does Not ClOse or Closes With
Difficulty 47
5. Inertial Safety Catch 02-31 Does Not Lock the
Breechblock in the Closed Position 48
6 Switch 02-42A (02-42) Does Not Return to the
Original Position 48
7. Inertial Safety Catch 02-31 Does Not Disengage 50
8. The Firing Pin Does Not Raise and Does Not Come
Down 50
9, Misfires 52
10. The Cartridge Case roes Not Eject 57
Chapter Four. Maintenance of the Cradle 58
1. Stop 5b09-15 Does Not Hold in Traveling and Cambat
Positions 58
2. Bushing With Bracket 5b09-10 Is Not Checked by Stop
09-48 When Stop 5b09-15 is Set in Traveling
Position 58
3. When Stop Sb09-15 is Set in Traveling Position,
Rod. 6%09-30 Is Not Checked by Stop 09-93
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1. When Stop Sb09-3.5 is Set in Combat Position,
Stop 09-93 Hinders the Free Movement -of' Rod.
5b09-30 50x1-HUM
5. Difficulty in Switching stop sb09-15 From Traveling
Position to Combat Position and. Conversely When the
Recuperator is Detached From the Cradle 60
6. A Bend Or Break in stop (09-27) in Guns of Initial
Issue ? 61
7. Dents, Holes, and. Cracks # the Cradle 63
Chapter Five. Maintenance of the Recoil System 65
1. Oil Leakage in the Buffer and. Recuperator... 65
2. Oil Leakage Through Valve 10-57 With the Required.
Quantity of Oil in the Recuperator 71
3. Oil Leakage From the Recuperator Through Packing,
Sealing Ring 10-115 and. Ring 10-122 When the
Barrel is Artificially Recoiled 71
,
4. Air Leakage (Nitrogen) From the Recuperator 71
5. Extended Recoil.. 72
6. Contracted Recoile? ? ?-? ? ea ? a ? **** ? ? ? ? ? ? ? ? ? ? 78
_
7. ra., iaire' to Run Out or Run Out With Jerks 81
8. Abrupt Run out (Run Out With a Knock)
9. Extended Roll Out of the Gun During Firing 87
10. Rust on the Outer,and. Inner Surfaces of Recoil
Piston Rod 08-12, On the Outer .Surface of
Recuperator Rod. 10-32 and. Rod. 08-28, and. On the
Inner Surface of Brake Cylinder 10-4, Stuffing
Box 08-2, Forward Cap 08-23, and. On Stuffing'
.Box 10-77
U. Wear of Recuperator Piston Rod Rings 10-97 a.n
10-99
12. Duna-gad Grid 10-122 of the Regulating Bolt Plug
88
89
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13. Dents and. Holes in Brake Cylinder 08-1
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14. /Dents and. Holes in Air Cylinder 10-3, Inter-
mediate Cylinder 10-9: and Operating Cylinder
10-4
Chapter Six. Elevating and Equilibrator Maintenance.
1. Air Leakage From the Equilibrator
2. Difficult Travel of the Elevating Mechanism
3. Increased Gross Vertical Unsteadiness of the Gun
Tipping Parts
90
91
91
95
98
Increased Play of the Elevating Mechanism (More
Than 5/8 Turn of the Wheel) 102
Broken Gear Teeth of Crankshaft 21-1 and Broken
Teeth of Arc :0950 105
Holes and Dents in External Cylinder 23-146 and
in Cylinder 23-3 of the Equilibrator Piston 105
7. Weakening of Rivets 21-21 Which Connect Tread
21-19 to Nave 21-20 of the Worm Wheel 106
Chapter Seven. Maintenance of Traversing Mechanism and
Upper Carriage 107
1. Stiff Operation of the Traversing Mechanism 107
2. Increased Gross Horizontal Unsteadiness of Rotating
Parts 109
3. Increased Play in the Traversing Mechanism (More
Than 7/8 Turn of the Handwheel). 113
4. Increased Disturbance of Horizontal Laying During
Firing Resulting From Slippage in the Clutch of
the Traversing Mechanism 116
Increased Total Clearance Between Front Clapp 17-70
and the Lower Surface of the Edge,of.the Lower
Carriage and Between the Bearing Surfaces of the
Upper and Limier. Carriages -
11650X1 -HUM
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Stop 17-9 Does Not Securely Lock the Upper 50X1 -HUM
Carriage to the Lover in the Traveling
/Position 120
7. Wear in the Junction of Stop 17-9 With the Openings
in Cylinder 17-7 and. the Lower Carriage 120
8. Broken Teeth on Gear Shaft 22-1 and. Arc 18-47. 121
Chapter Eight. Maintenance of the Lower Carriage and Trails. 122
1. The Gun Suspension System Does Not Function 122
2. The Suspension System roes Not Disconnect 122
3, The Suspension Does Not Connect 123
4. Wear in the Junction of Pintle 18-18 and the
Aperture in Combat Locking Lever 18-16 or 18-17
and the Aperture in Balance Beam Sb18-10 or
5b18-11 126
Defects Causing MalfUnctions in the Suspension
System 128
Trails Do Not Lock In Combat Position
130
7. Trail Supports (Gibs 19-454),Do'Nct Adjoin Supports
in LQWer Carriage When Trails Are in Combat -
Position 133
. Wear of Trail Supports (Gibs 19,645) in the Junction
With Lower Carriage Supports 135
9. Wear in the junction of Parallel Motion Bar 18-38
. With Rear Bushing 18-26 Or 18-27, With Coupling
Screw 18-39, or With the Parallel Motion Bar 18-37 136
10. Wear of Trail Supports.. ?4- 138
11. Increased Sagging of One Trail in Relation to the
Other 138
12. Summer Spades Sb19-51 are Not Held in Traveling
Position by Latches Sb19-6l. or Sb19-63
13. ClnmP 19-193 is Not Held in Combat Position by
Stop Sb197119....................... 0000000000000000
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14. Barrel is Not Locked or is Insecurely Locked
in Traveling Position 50X1-HUM
/
15. An Increased Overall Lateral Gap in the cl'unction
of Breech Ring and. Supports 19-438 and. 19-439 on
the Trails 140
16. Handle Sb24-16 is Not Held to Trails by Stop
Sb19-116 142
17. Cleaning Rod Storage Box Sb19-/2 is Not Secured
to Trails by Detent Sb19 -116 142
18. Clamp Ring Sb19 70 is Not Secured by Stop Sb19-118 1114:1421
19. Dent's, Holes, and Cracks in the Trails and Spades 144
20. Cracks in Lower Carriage and Balance Beams.. .. . ...
21. Nicks in Slots and Cracks in. Torsion Bar and.
Damage to the Prcrbective Coat of Paint and. Rust
on Bar 18-32
ahapter Nine. Winch Maintenance 146
1. Handle Sb20-5 is Not Stopped by Stop 20-55 on the
Axle of 1eft Carrier 20-25 146
2. Insecure or Difficult Fastening and. Setting of
Suspension Shackle 5b20-2 in the Traveling
(Operating) and. Firing Positions
1146
3. Difficult Winch Travel 151
4. Involuntary Turning of Handle Sb20-5 Due to Winch
Tightness 152
Chapter Ten. Maintenance of the Jack 155
1. Jack is Not Secured to the Trail by Stop 3b19-115 155
2. Leakage of Fluid. From the .Jack 155
3. Leakage of Fluid Through Valve 24-62 When Lowering
Trail
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4. Insufficient Travel of the Piston Rod. for Raising
the Trails When Removing the Trails From. the Limber
or When Placing Them on the Limber 158
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5. Trails Are Not Kept in a Raised Position by Jacks..
'50X1-HUM
6. Neal- or Damage of Ring 24-14 and Gasket 24-27 158
7. Dents and Holes in Exterior Cylinder. Sb24-1 159
Chapter Eleven. Wheel Maintenance 161
? 1. Stiff Movement of Wheels 161
? 2. Axial Instability of Wheels As a Result of Worn
Bearings 7714 and 7518 161
3. leakage of Lubricant From Nave Sb25 -2 162
Dents Cracks and Roles in Nave of Wheel 162
5. Breakage of the Lug of Nave Sb25-2 162
Chapter Twelve. Wheel? Brake Maintenance 164
1. Air Leak/gee Out of the Wheel Brake Supply System 16/4
2. Inoperative Hand Brake 1711
3. Inoperative Air Wheel Brake 182
4. Brake Drum Heats Up When Gun is Being Moved 184
? 5. Lever seb26-13. is Not Locked by Pawl 26-53 on
Notched Segment 26-75 185
6. Arm 26-46 of Notched Segment 26-75 is Bent 186
7. Wheel Brake Locks or Releases Involuntarily When
Gun is Being Transported by a Tow Vehicle 186
8. Punctures and Dents in Receiver Sb26-39 (Sb26-30) 186
Chapter Thirteen. Maintenance of Shield Assembly 188
1. Cracks in the Shield 188
2. Holes in the Shield 188
3. Damaged Shield Assembly Mounts. 50X1-HUM_Lou
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i. Aperture Covers Sio27-3 and Sb27-41 of the 50X1-HUM
Shield Are Not Held in a Fixed Position
/by Latch 27-4 191
Chapter Fourteen. Maintenance of Sighting Devices 194
1. Preparing the Gun for Testing Sighting
Devices 194
2. Instructions on Leveling the Barrel 194
A. Panoramic Sight S-71 194
1. Checking the Sight Fastening and Mounting on Gun.... 194
2. Vertical Play of Extension Sb41-37 or of Panoramic
Sight in the Panoramic Sight Socket 195
3. Horizontal Play of Extension Sh41-37 or of
Panoramic Sight in Panoramic Sight Socket 195
Vertical Play of Panoramic Sight in Extension
Sb41-37 Socket 196
Horizontal Play of Panoramic Sight in Extension
Socket Sb41-37 196
Range Drum Index 12-128 Does Not Hold in a Fixed
Position on Guide 12-125 197
Stiff Operation of Quadrant Angle of Site
Mechanism 197
Stiff Operation of the Cross-Leveling Mechanism 197
9. Difficulty Using Levels 198
10. Checking the Value of Graduation on Longitudinal
and Transverse Levels 198
Excessive Non-Reloveripg Longitudinal Play in
Sight
12. Excessive Non-Recovering Lateral Play in Sight
13. Increased Non-Recovering Play in the Angle of
Site Mechanism
199
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202
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14. Checking and CorreCting.Zero.:pOint of Sight .'..4 50X17HUM
15.. Maladjusted LOngittdinal Level 205
16. Maladjusted Transverse Level 206
17. Maladjusted Transverse Level With Tipping Parts of
Gun (Barrel) at Various Angles of Elevation 207
18. The Reading omAngle.of ElevationScaIe Con4iets With
the Actual-Angle of Barrel EleVatiOn ' 208
19. The Readings On Angle of Site Scale Conflict With
the Actual Angle of Barrel Elevation 209.
20. A Conflict of Readings of the Range Drum Scales
and the Actual Angle of Elevation 211
21. Checking the Zero Line OfSight 214
22. Axis of Bore Sighting-fines Not Parallel With the
Tipping Parts of the.Gtn (Barrel). at Various
Angles'OfEievatiOn - 216
23. Nicks, Dents, and Holes in Range Drum 12-119 217
B. Optical Sight OP-2
218
1. Checking the Sight Setting of Gun 218
2. Checking the Zero Line of Sight 220
222
Chapter Fifteen. Limber Maintenance
1. Unstable Coupling of the Limber With Coupling Bar
Sb46-10 and Limber Hook of Prime Mover 222
2. Stand Sb46-7 of the Coupling Bar Does Not Lock
in the Traveling Position 223
3. Difficult Transfer of the Coupling Bar Stand Sb46-7
From the Position For Supporting the Coupling Bar
(When the Limber is Disconnected From the Gun) to
the Traveling Position and Back
4. Non-Cushioning of the Limber
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Wear in the Coupling of the Pintle 46-58A
(46-58) With Bushings 46-62A (46-62) and
46-105A (46-105)
Page
50X1-HUM
225
6. Wear in the Coupling of Pintle Sb46 -12 With
Bushings 46-56 and 46-57 226
7. Limber Body Sb46-17 is not Maintained. in Middle
Position by Springs 26-69 226
8. Wear of the Coupling-Eye Collar 46-214 (46-13.3) 226
9. Burrs on the Right 146-52 and. Lett 46-53 Braces
and 'on Gibs 46-116 227
10. Burrs on the Bearing Surface of Nut 46-77 For Guns
of Initial Issue 227
11. Stiff Movement of Wheels 227
12. Leakage of Lubricant From Nave sb46-3 228
13. Dents, Cracks, and. Roles in the Wheel Disk 228
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Part Two
Flow Charts 50X1-HUM
Page
Chart 1. MaintenanceOf:theBarrel 233
Chart 2. Replacement of Cradle Guides 01-12, of the
Barrel Clamping Piece and. Cradle Guides'
-01-52 of the, Breech Ring 257
Chart 3. Preparation of Cylindrical Springs 267
Chart 4. Eliminating Eccentricity. in the
Striking of the Firing Pin 278
Chart 5. Removing Rust From the Surfaces of Recoil
Cylinder 08-1, Stuffing Box 08-2, Rod 08-12,
Inner Tube 08-22, ForWard Cap 08-23, Inter-
mediate Cylinder 10-9, Stuffing Box 10-75,
External Cylinder 23-146, External Cylinder ' (
Sb24-1 of the Jack, and Cylinder (6b26-3) 28h
Chart 6. Repair of Intermediate Cylinder 10-9, Air
Cylinder 10-3, Operating Cylinder 10-4,
External Cylinder 23-146, and External
Cylinder Sb624-1 of the Jack 294
Chart 7. Changing the Position of Cradle Arc 09-50
Chart 8. Repairing the Ball-and-Socket Joint of
Elevating and Traversing Mechanisms
302
306
Chart 9. . Repairing Teeth of Arcs 18-47 and 09-50,
Crankshaft 21-1,and:Gear-Shaft 22 1 312,
Chart 10. Changing the Position of Arc 18-47 322
Chart 11. Fitting the Bearing Surfaces of Clamps 19-193 328,
Chart 12. Repair of the Winch Roller, Brake 331
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Part Three
Appendix 50X1 -HUM
Page
. List of Parts and. Assembled Units Made in. Repair
Shops and Supplied in Serviceable Form 334
2. Instructions on Alterations of Parts and Assemblies
for Guns 11,46 and M-47 of Initial Issue 384
Defect Reports 399
Instructions on Checking and Drawing Lines for
Cross Hairs on the Face of the Muzzle Brake ****** 417
419
5.. Testing the Gun by Firing and by Moving
6. Means of Repairing Parts Having Stripped. Threads 422
7. Device for Measuring the Diameter of the Bore
Between the Grooves in the Place of Expansion 477
Graph of Permissible Depths of Dents in the
Outer Surface of the Barrel of Gun M-46 (If
There Are No Cracks) 479
Graph of Permissible Depth of Dents in the Outer
Surface of the Barrel of Gun M-47 (If There Are
No Cracks) 480
10. Gage for Checking the Axial Alignment of the
Outlet of the Muzzle Brake and. the Bore
481
U. Templates for Checking the Angle of Turn of the
Throttling Rod 482
12. Device for Bracing Panoramic Sight S-T1 486
13. Drawing of the Device for Checking Whether
the Axis of the Bore and the Sighting
Devices are Parallel 487
14. The Plumb 488
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Introduction [p 3]
This Manual contains basic instructions for inspection ar50X1-HUM
maintenance of the M-46 and M-47 guns. The only constructional
differenCes in these guns are in the loose barrel tubes, the muzzle
brakes, and the sight mechanism scale indentations. The remaining
?
parts and members of both guns are identical.
This Manual is intended as a basic maintenance document for
mobile maintenance shops.
Maintenance shop designations adopted in this Manual are the
same as those used in the General Manual for the Maintenance of
Artillery Weapons.
Gun maintenance should be done according to the methods specified
_
for corresponding maintenance shops.
Only the regimental maintenance shop -- is indicated in
the Manual if the methods for defect detection and correction are the
same for all maintenance shops.
The volume._Of,operations indicated by this Manual for regimental
workshops is calculated for a workshop which has electric welding
apparatus and onlya turning lathe for machine tool equipment,.
The volume of operations intended. by this Manual for .a DARM
51visional Artillery Maintenance Shogmust be done by higher
regimentalyorkshopswhich haveskilled and significantly qualified
personnel.
If a maintenance shop has facilities which allow it to use
machine tools for operations specified as manual operations by this
Manual, such a change should certainly be made.
This Manual consists of three sections:
-- The first section contains instructions for inspection and
maintenance of gun mechanisms and parts.
-- The second section is composed of flow charts with proper
references to the first section of the Manual.
-- The thirksection consists of appendices of listings,
specifications, diagrams, and drawings, illustrating mechanism
constructions. Again, references are given to other sections
50X1-HUM
the Manual.
Procedural instructions for dismantling and assembling the guns
are not given in this Manual since they are In the Service Manual for
the M-46 and M-47 airri.
[p
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First Section
Gun Maintenance
Chapter One
[p 5]
50X1-HUM
General Maintenance Instructions
The instructions for inspection and maintenance and also the
technical characteristics contained in the Manual pertain to M-46
and M-47 guns of initial and stbsequent;issueS.
In those cases where the technical Characteristics of the M-46
'gun are different from the technical characteristics of the M-47 gun"
and also in cases where the technical characteristics and instruc-
tions for maintenance are different from those for guns of initial
issue or, on the other hand, of subsequent issue, the text of the
Manual includes the following instructions: "for M-46 gun," "for
M-47 gun," "for guns Of initial issue," and "for guns of subsequent
issue."
? Locations where parts are to be reworked are shown by heavy lines
in the sketches. Also, only those dimensions necessary to perform
required maintenance operations are indicated on the sketches.
Ov'drawings which illustrate mechanism constructions, the
numbers 1, 2, 3, etc. denote the ordinal numbers of those defects
under consideration in the text of the Manual when the locations
of deterioration or damage need to be pointed out. Designations such
as 02-29, 08-6, Sb21-4, etc. denote numbers of gun parts and assemblies.
The numbers of parts and assemblies of guns of initial issue
which are different from numbers of corresponding parts and assemblies
of guns of subsequent issue are given in parentheses in the text and
in sketches and figures in the Manual.
The numerical notes (in small circles) in sketches of flow charts
denote the ordinal numbers of operations on the diagram.
A catalog of parts for? which there are no manufacturing indi-
cations in the flow charts, but for which replacements are provided
for by this Manual is presented in appendix 1 with instructions
indicating what type of maintenance shop must manufacture these parts.
Working lines (sketches) of these parts are included at the end of
the appendix. ? 50X1-HUM
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Shortcomings were discoVered during operation of guns of initial
issue. Methods for eliminating these shortcomings are given .
50X1 HUMappendix 2. These shortcomings must be ,corrected during maim..regardleis of the condition of the involved mechanism. Conventional
specifications for cleanliness of part surfaces on which maintenance
is being done or which are remanufactured are ,given in accordance with
GOST 2789-51.
Grades of Materia4 l'indicated_in the Manual for the manufacture
Of parts .are selected as follows :_ for steel according to GOST 38057,
GOST 1050-57, GOST 2052-53, GOST 4543,57, GOST, 5047-49, and GOST
5192-50; and for non-ferrous metals according to GOST 493-54, COST
6.13-50, COST 859741, and COST 1019,47,
Conforming bronze and brass of the grades BrAZhMts10-3-1,5;
BrAZh9-4; and LMtsA57-3-1 can be substituted for bronze and brass
indicated in the text and sketches of the Manual with the exception
of grade BrOTsS6-6-3 bronze.
If the grades of, steel indicated in the text or sketches of the
Manual are not available, other grades of steel can be used if they
provide the indicated category of durability (K or KT) and the
conforming amount of impact strength.
Alloyed steels can be replaced with 35MMA steel.
The grades of the recommended electrodes for arc welding are
chosen in accordance with GOST 2523-51. Other electrodes can be
used if they provide the required durability or seam hardness.
In maintenance shops which do not have special instruments,
heating temperature for quenching is determined by the colors of
incandescence and the temperature of annealing by the colors of
iridescence as indicated in the General Manual for the Maintenance
of Artillery Weapons.
1. Inspection Instructions'
Inspection must precede maintenance of every gun in order to
establish the technical condition of the gun and its members and to
determine the amount of work necessary to put the gun in a condition
conforming to combat service requirements.
Enter inspection conclusion in the inspection record (appendix 3).
To prepare the gun for inspection, the following should ',-
00X1-HUM
transfer the barrel fromthe traveling position to the firing
position and check to see if the piston rod is properly connected with
[p 6]
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the barrel and the recuperator rod is properly connected with the
cradle cut-off gear actuating collar. Check the rod connections by
testing the trigger mechanism operation and by opening the breech 50X1-HUM
mechanism. Bolt plunger Sb09-30 (fig.3) should release and be
freely moVable and the breech mechanism should be opened;
-- without removing the trails from the limber, place the barrel
at a negative angle of elevation of from 2? to 30 and check the
initial compression in the recuperator, which should be within 54 to
58 at. Next, reduce the initial compression to normal in order to
avoid an involuntary barrel recoil when moving the tipping parts of
the gun to positive angles of elevation;
-- transfer the gun from the traveling position to the firing
position;
-- check the equilibrator pressure with the tipping parts of the
gun at the maximum negative angle of elevation (the pressure must be
approximately 44 at.). Return the pressure to normal;
clean the dirt from the exterior of the gun and Kipe it dry;
-- remove the grease from the bore and breech block housing with
soapy water or kerosene and wipe them dry; .
-- dismantle the breech mechanism, scrub its parts with kerosene
and wipe them dry. Assemble the breech mechanism again and connect
it with the breech ring, after having lightly greased the contact
surfaces of the parts.
Inspection should begin with an external examination of the gun
in firing position in order to check for the absence of any gun
components or parts. Then, before dismantling the gun, check the
mechanisms in the sequence presented in the compulsory examination
schedule which is in the second column of section A of the inspection
record (appendix 3). Then, while dismantling, inspect those
assemblies, mechanisms, and parts (section 8 of the record) which are
in unsatisfactory condition.
Record the inspection results according to the instructions for
filling in the record (appendix 3).
If a mechanism operates with difficulty, dismantle it during the
inspection process, clean out any dirt, remove any scratches on the
parts, and reassemble it.
P 7)
If it is not possible to check the operation of a mechanism 50X1-HUM
(individual parts are broken or absent), check it after inserting
reserve parts or by measuring the most important members of the
mechanism under inspection according to the instructions given in this
Manual.
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NechamismS whieh Operate satisfactorily during inspection of the
assembled gun need only external examination du:tingailliant"56X1-.HUM'
to find cracks, mechanical damage, corrosion changes in co.i.v.u, unu
defective parts.
Press-fitted inserts in part seats must be tested for movement.
Inserts should not move.
To determine the practical dimensions of worn parts, measure the
parts in the places of the greatest year.
Measurement of the thickness of gear and segment teeth and of the
thickness of worm threads, which is considered in the first part of the
Manual, should only be done in those cases when a check reveals that un-
steadiness and play of the mechanisms exceed the limits allowed by this
Manual and when wear of teeth and threads is noticed in the gears, seg-
ments, and worms upon external examination.
The results of mechanism, component, and part inspections which [10 8]
are determined during dismantling the gun should be entered in section
B of the record.
If the gun is at a regimental maintenance shop for the correction
of one or, more predetermined malfunctions; complete dismantling and
detailed inspection of the gun is not necessary. In this case, it is
necessary only to complete a general examination of the gun and to
inspect it only while it is assembly, but it is necessary to dismantle
and perform a detailed inspection of the defective mechanisms.
Check the gun after maintenance in a regimental maintenance shop
completely according to the instructions of the Manual (See chapter 1,
section )i.).
In mobile artillery maintenance shops, it is necessary to inspect
the recoil-meChemism-gasketswhile:the.mechanismiS aSSeinblea-tn order
to find,:_ liquid and air (nitrogen) leaks through the gaskets. Find
remaining recoil mechanism defects after dismantling.
- The recoil mechanism does not have to be .dismantled. if it, is knbwn
that it is operating normally and the. next overhaul, period is not yet
due. ? ?
If dismantling of the recoil mechanism is not required, it is
necessary to cause an artificial barrel recoil of from 450 to 500 mm
in order to inspect the recuperator and recoil piston rods at the
places where they have gasket scalings and in order to check the character
of the liquid. - To examine the piston parts of the recupe ra50X1-HUM;ing
cylinder, head 10-114 must be screwed on the operating cylinder.
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Check the sighting mechanism illumination system by turning on all
of the bulbs. If -the bulbs-db-hot light up) check to see whether thAv
have burned out or whether there, is, a short-circuitin the lighting 50X1 HUM
cuit.
Check the lighting power supply circuit of the gun while it is
in traveling position in the following manner:
Connect one end of .the wiring to the tow vehicle. After placing
the wire plug in the tow vehicle SOcket, connect the other end of the
wire to the plug socket on the gun trail;
???? switch on the tail lamp of the tow Vehicle.. The lower bulb of
the lamp (the tail light) should be illuminated;
-- press the brake rednJ on the tow vehicle. This should light
the upper bulb of the lamp (the stop signal light).
If the bulbs do not burn, check 'whether they are in working order
and whether there is a short-circuit in the gun electric circuit, having
first checked the working order of the tow vehicle lighting circuit.
Replace faulty bulbs with new ones. Correct any short-circuits in
the electric circuits.
Rote. The rear lights on guns of initial issue .have one illum-
inating bulb (there is no stop aignal bulb).
2. Dismahtling Instructions
The following is necessary to dismantle the gun:
1. Expose the lock screws and unscrew them.
2. Use only official tools and appliances.
3. When removing cotter pins, first bring their parted ends
together with pliers.
4. Avoid breaking keys and removing unscrewed or neighboring
pieces when unscrewing and screwing parts.
5. Dislodge bolts with a copper knock-out rod.
ha 9]
6. Do not use excessive force in breaking down parts. If a part
does not yield, drench it with kerosene and tap around it with a 50X1-HUM
hammer.
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7. Notice the mutual positions of parts during dismantling in
order to reestablish mechanism adjustment during assembly of t150X1 -H UM
Noticre how far adjusted threaded connections are screwed in. Mea-
sure and record existing :.elearances which, if changed, can irrauence
mechanism adjustment. Mark the mutual arrangement of adjusted parts
with lines or shallow scratches. Mark the lines or scratches accurately
in order not to damage parts.
8. In separating a mechanism from the gun or a part from a mechan-
ism, notice the position of adjustment lines.
9. During dismantling, :lay out parts, which can be. confused during
assembly, with the parts which they connect with or label them (with
paint or scratches).
10.- Remove keys which are set tightly in key slots only in those
cases when it is necessary during dismantling or to repair or replace
them.
U. Place removed members and. parts on benches, stands, and tables.
12. Protect polished, burnished, and rubbed parts from nicks,
scratches, dirt, and rust.
13. When dismantling mechanisms which have Springs, Observe the
safety measures indicated in the Service Manual.
14. Unscrew lower muztle brake bolt 01-46 (fig. 1) before removing
the barrel from the cradle to prevent damage to the front cradle cap.
3. Maintenance and Assembly Instructions
1. Overhani-the'gnn in accorannce with the results of an inspection
executed according to the Inspection Instructions.
2. The scope of the technical characteristics determined in this
Manual for releasing a gun from maintenance is calculated to provide a
definite reserve for usage of the gun following its release from main-
tenance. E p 10]
To attain a large usage reserve, it is recommended, if the time
and situation permit, that those parts also be repaired which are worn
close to the allowable limits authorizing the release of. the gun from
maintenance.
50X1 -HUM
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3. For correct assembly of tooth and worm meshings, mark them with.
paint (where necessary) and-adjust #1012,-
50X1-HUM
4. Insignificant black spots and cavities are permissible at those
places.were welded metal changes to "baae metal on the surfaces of parts
which have been repaired by welding.
5. Welding or beading can be duplicated if there is no distorted
metal at the location of welding or, beading.
6. If there is deformation of parts after welding, they can be
corrected without heating.
7. If the proper reamer is not available for reaming openings
according to the dimensions indicated by the sketches, it is permissable
to use reamers which do not differ more than 0.5 mm from the nominal
? dimensions of shaft alignment in the opening as long as reqyired fitting
conditions are preserved.
8. In replacing ;Tess-fitted parts (inserts), the manufactured
parts (inserts) can be reseated in conformance with the dimensions of
the adjoining part as long as the press seating is preserved.
9. If a cotter pin hole in a bolt does not align with a cotter
pin hole in a nut, a second hole can be bored in the bolt to coincide
with the hole-in the nut, but the newly drilled hole in the bolt cannot
intersect with the old hole.
10. Cotter pins and lock washers except for spring washers, should
be annealed before reassembly.
11. The threading of cylinders and casings, the inside threading
of collars and rods, and the inside threading of the recoil mechanism
should be thoroughly wiped and covered with a thin layer of cannon
grease before assembly.
Trim off raised metal burrs on external threading with a triangular
file or scraper and on internal threading with a hook-shaped scraper
which is sharpened according to the thread profile.
12. Undamaged leather collars of wheel brakes (on guns of initial
issue); leather rings of the recuperator, leveling screw jack, and
equilibrator; and buffer and recuperator gaskets can be reused.
To use leather collars and rings
-- wipe collars and rings with a
for 10 to 15 minutes in steol M [type
450 or 50?. After wasting, wipe them
room temperature for 1.5 to 2 hours.
the following is necessary:
:
clean, dry rag and immerse ,....-- 50X1-HUM.
M'clear oi17]. which is heated to
with a clean rag and dry them at
Protect them from falling dust
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--soak collars and rings for 10 to 15 minutes in a mixture hp 11]
composed of 75% ceresin 15% vaseline, and 10% AU axle grease5oif_Hum
heated to 650 or 709;
--after treating collars and rings dry them. Place collars on
collar rings for drying.
Wash gaskets_which have been used in water heated to 909 or 100?,
'After drying, soak them for .15 to 20 minutes in a solution consisting
of 75% ceresin, 15%-Vaseline; and 10% AU axle grease which is heated to
659 to 70?:
13. Before lining recoil mechanism cylinders with steol M which
has been used, carefully filter it and check for alkalinity.
14. Press-fitted recoil brake and recuperator mechanism copper
gasket rings which have been used can be placed in further service if
they provide a proper seal. For best sealing, the rings should be
annealed by heating them to 600? to 650? and cobled in water. Then,
trim the ring facings.
15. Tubing with soldered headslvalves, and joints Should be
carefully washed with water, blown through by a jet of compressed .air,
and dried before assembly.
16. For soldered connections of recoil mechanism parts, the solder-
ing should be done by acid-free soldering in accordance with the
instructions in the General Manual for Maintenance of Artillery Weapons.
17.- To cover "allof the links in winch chain Sb20-6 uniformly
(fig. 12), immerse the chain for 5 minutes in cannon grease which is
heated to 800 or 1009.-;
18. Check the throttling rod travel in both directions at the
place where the cradle is joined with the rod and double-arm lever
09-105. The force of one hand applied to double-arm lever 09-105
(fig. 3) should be sufficient to move the throttling rod.
Also, check the clearance between the rear facing of lever 08-40A
and the front facing of nut 08-27. The clearance should be smaller
than 2 mm (fig. 4).
19. To prevent upper lever 09-100A from grazing the cradle aperture
wall when giving an angle of elevation of from i-15?. to 4400 to the
tipping parts' of'the gun, trip the cradle aperture to provide a' clearance
of 1.5 to 2 mm between upper lever-09-100A'and the cradle ap 50X1-HUM1
(fig. 3).
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20. Double-arm lever roller 09-107 should set in the groove of cam
guide 17-20 at a depth greater than 8 mm. If the roller is not set far
enough into the cam guide groove, place a steel washer with a thi
5uX1-HUM
of 4 mm aid a diameter equal to that of the roller on roller pin uy-J.vu.
There should be at least 0.5 mm of clearance (fig. 3) between the end
of roller 09-107 and the surface of cam guide 17-20.
21. When adjusting the tightness of recuperator rod stuffing 10-80
with nut 10-81, leave a reserve of the nut threads at the furthest
gdjustment during gun oPeratj.en (the end threadq_of.n#.10-81 should not
redess past the face of stuffing box 10-75)(f 1g. 5).
22. When assembling the equilibrator of a gun of an initial issue
? where bushing 23-6 is locked by Washor'(23-9), keep a clearance of 0.3
to 0.5 mm between the face of bushing 23-12 and collar 23-74 (fig. 6)
to provide normal collar operation.
To, attain the Indicated clearance, during assembly of the external
cylinder (after pOsitioningthe'buShings 23-10 and 23-13, the adjusting
ring 23-11, the collar 23-74; the bushing 23-12, the washer (23-9),
, and the bushing 23-6-in the cylinder), two plates (dimensions of the
plates: 0.5 mm in thickness and 25 to 30 Mm in width) should be placed
in diametrically contrasting directions between the faces of bushing
23-12 and collar 23-74 and bushing 23-6 should be screwed up to the
stay. Then, remove thefplates and:lock:bushing 23-6 with washer (23-9).
23. With the. barrel In firing position, there should be at least
a 1 mm clearance between the upper surface of plate pivot 09-82 (fig. 3)
and the upper surface of 'the groove on the' left wall of the breech ring.
If the clearance is smaller than 1 mm, drop plate Sb09-18 down
until a clearance of 1 is attained'. Cut five oval holes (oval in a
vertical direction) in plate bracket 09-84 (for bolts to)attach the plate
to the crad10:and file the lower surface of the 'shoulder of bracket 09-84.
24. With the barrel in the firing position, there should be at least
1 mm of clearance between catch 01-35 and the external surface of cradle
? plate Sb09-18 (fig. 3) and there should be a clearance of at least 2.5
'mm between the left surface of the breech ring and the edges of plate
Sb09-18.
If the clearances are smaller, straighten out plate Sb09-18.
. 25. With the barrel in the firing position, stop 0948 (fig. 3)
should be in the groove of the extension of flange nut 10-65 (fig. 3)..
If the stop is not in the: groovebut rests on the rear facing of.
the Wit extension; clear the 'groove in the:extension of nut 10 ?50X1-HUM
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26. Checking of the distance conformity between recoilin=11,RA
guide 10-28 (fig. 1) and recoil indicator 09-55 (fig. 3) by the-n.L-7
of indicator 09-55 on guide 09-53 is done in the following sequence:
/ -
place the trails on the limber;
-- with the barrel in the firing position, make a mark with a
marking tool on the upper surface of the cradle guide 900 mm from the
rear face of the front barrel ring;
-- haul the barrel up with the winch until there is coincidence of
the rear face of the front ring, with the mark which was made in the last
step;
? eheck the reading of indicator,09-55 on indicator guide 09-53.
The indicator reading shoUld be within 897 to 903 mm.
If the reading is not within the indicated limits, unscrew the
three nuts on the bolts which hold the recoil indicator guide to the
cradle for one or two turns and shift guide 09-53 to the place where
recoil indicator 09-55 coincides With the number "900" on recoil [p 13]
guide 09-53 while indicator 09-55 is brought. up to the stay in guide
01-28. There is a tolerance her of :1-3?
mm.
Fasten the recoil indicator guide to the cradle with the nuts.
27. Check the engagement of recoil indicator guide 01-28 (fig. 1)
with recoil indicator 09-55 (fig. 3) with the barrel drawn out. The
engagement should be greater than 4 mm in vertical and horizontal posi-
tions. If the engagement is smaller than this, build up a layer of
metal on guide 01-28 with an E42 electrode and machine if for local
conformance.
28. To provide the maximum negative angle of elevation of -20 30'
for the tipping parts of the gun, negative angle of elevation limiter
17-74 can be filed (fig. 8) ora layer of metal can be built up on the
limiter with an E42 electrode and then smoothed by filing..
29. To provide the maximum angle of elevation of-L460 for the
tipping parts of the gun, cradle arc limiter 09-143 can be filed (fig.
3) or a layer of metal can be built up on the limiter with an E42 electrode
and then smoothed by filing.
If it is necessary to build up brass limiter 09-143 (on guns of
initial issue), build up a layer of brass on the limiter by gas eab5CI-HUM
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30. To provide an angle of traverse of-I.25? for the rotating part
of the gun, lower carriage arc catches 18-3 (fig. 10) can be filed
a layer of metal can be built up on the catches with an E112 elect/-
and smoo'hed by filing. If it is necessary to build up brass stays
18-3 (on guns of initial issue), build up a layer of brass on the stays
by gas welding.
31.1 For assembly, place the parts in the same locations in which
they were located before maintenance by using the marks and scratches
which were made before dismantling.
32. After assembly, adjust the MeOhanisms in accordance with the
instructions in appropriate chapters of this Manual.
33. Before assembly, grease all parts in accordance with the
instructions in the Service Manual.
34. After the assembly of any mechanism or part of a mechanism,
ascertain the correctness of assembly by checkingthe operation of the
assembled mechanism. Tighten the lock screws.
-35. Retouch discolored places according to the instructions in the
General Manual for the Maintenance of Artillery Weapons.
36. After maintenance, enter the completion of maintenance in the
inspection inventory book and enter all necessary entries concerning
maintenance execution in the gun service log.
4. Instructions for Checking the Gun after Maintenance
a. Check the meehanisms og the assembled gun according to the
catalog of compuls&Y ahecks (apPendix-3; section-A)-and compare%-the
dmspection results achieved after maintenance with the inspection
results achieved during the preliminary inspection (appendix 3, section
A).
Gun mechanisms which were in satisfactory condition and therefore
not subjected to maintenance should be in no worse technical condition
after assembly of the gun than they were in during the preliminary
inspection. The technical condition of repaired mechanisms should
comply with the requirements of this Manual. [p 14]
2. Check the position of the graduation lines on the muzzle brake
facing (appendix 4).
There can be a 0.5 mm deviation of the cross lines center from the
bore axis.
50X1 -HUM
If the deviation is greater than 0.5 mm remove the old lines and
replace them with new ones.
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Then, check the zero sight line.
50X1 -HUM
3. Test the gun by firing (appendix 5) if the following operations
were done/during maintenance:
overhaul or repair with overhaul of the recuperator;
removal of bulges in the bore;
-- sealing of holes in the barrel by the insertion of threaded
plugs;
-- replacement of cradle-guides 01-12 of the barrel rings and of
the breech ring (fig. 1).
4. Check wheel brake operation in accordance with appendix 5.
5. Instructions for the Correction of General
Defects
Corrections of general defects (dents, punctures, cracks, etc.)
of parts are done in accordance with the General Manual for the Mainten-
ance of Artillery Weapons while considering the following additional
instructions.
In the adjoining parts indicated below, small local damage of
threads is permissible if there is Aot total disruption of pitch in
the damaged places. The overall permissible length of thread damage
is less than.% of the length of the screwed connection (the stationary
connection of the screw with the nut).
This relates to the following parts connections:
jacket 01-2 and breech ring 01-3 (fig. 1);
tube 01-1 and muzzle brake 01-51 or 01-45;
coupling screw 18-39 and coupling housing 18-42 (fig. 10);
link belt 19-100 and bolt 19-103 (fig. 11);
tie bolt 19-122 and clamp nut 19-258;
tie bolt 19-513 and bushing 19-519;
adapter 17-11 and cap 21-83 (fig. 7); 50X1 -HUM
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-- brake disk 21-85 and nut 21-97;
-- eye bolt 46-214 (46-213) and nut 46-114 fig. 19);
-- chassis pintle 46-129 and nut 46-77.
50X1-HUM
[P 15]
If the threads of the enumerated parts are stripped, replace them
:except for link bolt 19-100,. bolt 19-103; brake disk 21435, and eye bolt
46-214 (46-113) which should be repaired in this' case according to the
instructions in appendix l'6.
. In the connections listed below, the length of permiss:ble thread
stripping is less than 10% of the screwed connection length.
This relates to the following part connections:
the muzzle brake and. bolt 10-46 (fig. 1);
-- pin 01-8 and. nut A51011-7;
-- stuffing box 08-2 and stuffing nut 08-7 (fig. 4);
--'stuffing box 08-2 and nut: 08-11;
-- recoil cylinder 08-1 and nut 08-10;
- recoil cylinder 08-1 and nu-L.08-46;
-- rod stem 08-13 and rod. nut08-53;
pistonhead 08-14 and nut 08-31;
moderator stem 08-17 and valve nut 08-20;
forecap 08-23 and nut 08-27;
? forecap 08-23 and nut 08-29;
-- throttling rod 08-28 and nut A51011-40;
throttling rod 08-28 and nut 0842;
-- nut 0846 and screw 08-47;
-- air cylinder Sb10-2 and nut 10-26 (fig. 5
7- air cylinder Sb10-2 and nut 10-29;
50X1-HUM
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-- nut 10-26 and screw 10-27;
-- nut 10-29 and screw 10-27;
/ r
_-'stuffing box 10-75 and stuffing nut 10-81;
-- rod 10-32 and flange nut 10,,65j
-- cap 107114-and a4juster bolt 10-120;
50X1-HUM
-- operating cylinder 10-4 and intermediate cylinder 10-9;
operating cylinder 10-4 and head 10-114;
axle box 17-22 and nut 17-26 (fig. 8);
-- bolt 17-35 and nut 17-39;
loint1ercEa317-42 and adjuster bolt 17-43;
in 17-2 for the cap square and nut A51011-8;
? adapter bushing 17-58 and lock nut 2a-.2,, (fig. 1;
axle box casing 17-50 and lock nut 17-53 (fig. 8);
the upper carriage and bolt A51000-47;
pintle 17-62 and nut 17-63;
pin 18.8 and nut 18-11 (fig. 10);
yoke 20-51 and eye fitting 20-70 (fig. 12);
worm fitting 21-22 and nut 21-84 (fig. 7);
-- external cylinder 23-146 and bushing 23-6 (fig. 6);
pin 23-141 and nut A51c11_5;
bolt 25-10 and nut 25-11 (fig. 14);
bolt (25-18) and nut 25-11;
bolt 46-18 and nuts 46-19 and 46-193 (fig. 19);
king bolt 46-58A and flange 'snrr 46-209;
[p 16]
50X1-H UM
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-- king bolt (46-58) and nut(46-201);:
-7 114 46-8 and nut 46-90.
In the remaining threaded connections
screwed connection length is permissible.
Follow the instructions in:.appendix6 and, in the General Manual for
the Maintenance' of Artillery Weapons to repair _part threads. ?
50X1 -HUM
damage of up to 25% of the
50X1 -HUM
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50X1-HUM
Chapter Two
Maintenance of Barrel
1. Elongation of Breech Chamber
(fig. 1)
The condition of the bore is characterized by the elongation of the
breech chamber. As a result of the elongation of the chamber, the
ballistic qualities of the gun are lowered; that is, the muzzle velocity
of the shell decreases and the- dispersion increases.
The fitness category of the barrel is determined by the elongation
of the breech chamber in accordance with the existing Instructions for
the Categorization of Artillery Armament.
The degrees of elongation of the breech chamber, the decreases in
muzzle velocity, and the category of the barrel should be recorded in
the gun service log.
DARN. If the barrel is considered to be in the reject category,
replace tube 01-1 (appendix 1).
2. Copper Fouling of Bore
(fig. 1)
PM. Copper fouling in the bore should be removed by chemical means
(with a solution of RChS) in accordance with the existing Instructions
-
for Chemical Cleaning of Bores of Artillery Barrels.
3. Bent Barrel
(fig.j)
Check the straightness of the bore with special calipers. Size of
calipers: for barrel of gun M-46 -- diameter 01-- 0.1) -0.08 mm, length
650 nal; for barrel of gun M-47 -- diameter (D--0.08) -0.08 mm length 600
mm.
Note:Aand D signify nominaldiameters of the land (caliber), of the
bore: XI.-for..gun M746; D7.,f0r:gup ivI1.i.7 50X1-HUM
For convenience n. pushing the calipers-through the bore,. use a
regulation pole and cleaning rod,
[p 17]
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The calipers should pass through the bore withbu 50X1-HUMt jamming.
DARM. If the calipers do not pass through the bore as a result of
bending, and not from the elevation of the edges of the land, the
presence of heavy copper fouling, or other reasons, replace tube 01-1
(appendix 1).
4. Expansibn Of the Bore [p 1811k .
(fig. 1),
Rnn a wad through the,bOre and inspect the bore carefully.' If a
dark ring is noticed in the bore: or. if, while running the wad through
the bore, the wad passes through certain parts more easily than others,
or if the sound of the rod striking against the wad changes, the bore
has expanded:
With a star gauge or special device (appendix 7) measure the diameter
of the bore between the grooves in the place of expansion, and also
check whether the internal expansion has caused external expansion,
which is determined by the gap between the surface of the barrel tube
and a rule applied to the outer surface of. the barrel tube in the
place of internal expansion.
If internal expansion has occurred in the section of the barrel
tube which fits into the jacket, it is necessary to remove the tube
to check the external expansion.
The diameter of the bore between the grooves in the place of
expansion should be: for the barrel of gun M-46--no greater than i1+8.1)
mm, for the barrel of gun M.-47--no greater than (Di- 4-.5) mm.
DARM. If the diameter of the bore is greater than the dimension
shown above or if internal expansion has caused external expansion,
replace tube 01-1 (appendix 1).
If it is impossible to remove the tube as a result of wedging in
the place of expansion, replace the barrel (appendix 1).
The diameter of the bore at the place of permissible expansion, the
length of the expanded area and its 'location in the tube should be
recorded in the gun service log.
In the maintenance process it1s.:neCessary to periodically
50x1-HUM-
the barrel, determine the degree Of ejcPanSion,. and record the fir
in the gun service log. .1f?theeXpansion 'increases, replace the tube
or barrel (appendix 1).
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50X1-HUM
5. Dents on the Outer Surface of the-Barrel
(fig. 1)
Dents on the outer surface of the barrel are allowed in accordance
with the data given in the tables (appendices 8 and 9) if there are
no cracks in the damaged area.
In barrel sections a and b of the front and rear rings, the permissable
depths of dents are given without regard for the thickness of the walls
of the clamping pieces.
PM. Remove the raised metal, clean the dented area and the area
surrounding it until a metallic luster appears, and polish.
Apply a 10% solution of hydrochloric acid to the surface of each
dent. After a certain time dark traces will appear along any cracks
in the surface.
The edges of dents on a cannon allowed to remain in service should
be rounded off.
Send the gun to a higher Maintenance workshop in case of the following
defectS:
-- the depth of the dents is greater than the dimensions shown in
the tables;
-- cracks in the surface of the dents;
-- bulges in the bore formed by dents.
DARM. Remove bulges in the bore formed by dents (chart 1).
AARM [Army Artillery Maintenance Shop]. If the depth of the dents
is greater than the dimensions shown in the tables, or if there are
cracks resulting from the dents, bore out the dents or cracks and seal
the tube and barrel jacket with threaded plugs as indicated below in item
7.
If the length of a crack exceeds the permissible diameter of a plug,
replace tube 01-1 or barrel (appendix 1).
6. Cracks on the Surface of the Bore 50X1-HUM
[p. 19]
D,r+
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50X1 -HUM
Cracl5p in the barrel are not permissible.
. When it is suspected that there is a crack on the surface of the bore,
test the area in question with a needle. fastened to a wooden pole.
The needle will become stuck in a crack but will glide over a smooth
surface or a scratch.
laRM. When a crack appears', drill through the wall ,of the bore in
the place of the crack and insert a threaded plug as specified in item
77 If the length Of. the crack exceeds the Dermisslble diameter of a plug,
replace tube 01-1 .(appendix 1) 1 [Trans.. note: footnote missing]. .
7. Roles in the Barrel
(fig. 1)
AARM. Holes in the barrel should be sealed with threaded plugs
(chart 1).
Depending on the location of the holes in the barrel (sketch 1) the
following diametersfor plugs are permissible:
For barrel of gun M-46
a) in the barrel tube:
-- in section 12--no greater than 33 mm,
-- in section 13--no greater than 39 nall;
-- in section 14--no greater than 48 mm.
The pitch of the plugs' threads should be: in sections 12 and 1
2mm; in section 14--3mm-
Plugs are not permitted in sections 11 and 15. [p 20.
b) in the barrel jacket:
in section 16--no greater than 30 mm;
in section 17--no greater than 42 mm.
50X1 -HUM
The pitch of the plugs' threads should be: in section 16-0.75 mm, in
section 17--lmm.
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? ? ?
50X1 -HUM
50X1 -HUM
? Vt.
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0.
Plugs are not permitted in sections 2, bo and c, of the jackaX1-HUM
/
For the barrel of gun M-47
a) in the barrel tube:
-- in section 12 no greater than 39 mm;
^ in section 13-.- no greater. than 52 mm;
^ in.section L4 7- no greater than 60 mm.
The pitch of the plugs' threads should be: in-seCtions L2 and L3
2 mm; in section L4 mm.
Plugs are not permitted in sectionsLi and
b) in the barrel jacket
7- in section L6---. no greater than 30 ram;
-- in section L7 -- no greater than 42 mm.
The pitch of the plugs' threads should be: in section L6 -- 0.75 ram;
in section L7 -- 1 mm.
Plugs are not permitted in sections a, b, and c of the jacket.
If it is impossible to seal holes with threaded plugs of the sizes
specified, replace tube 01-1 or the barrel (appendix 1).
Guns having barrels which have been repaired with threaded plugs
should be checked by firing five full-charge rounds.
The repair of a barrel with threaded 'plugs should be noted in the
gun service log, thereby indicating the necessity of observing the
repaired parts while in use (to see whether the plugs have loosened
or whether cracks have appeared in the place of repair).
8. Nicks and Scratches on the Clinometer Plane
PM. In the case of nicks or scratches, carefully remove the raised
metal with a scraper or hand file without removing the dents in the
metal or allowing the tool to damage the adjacent, undamaged sect.-5 OX1 -HUM
The partial or complete scraping of the clitiometer.plane is forbidaeu.
[p21]
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50X1 -HUM
9. Rust on. the Adjoining Surfaces of the Barrel Jacket and Barrel
Tube /
PM. Rust on the inner surface of the, jacket and the outer Surface
of the thbe should be removed with an abrasive cloth greased with steal M.
, Before beingaSsembledi-the-adjoining surfaces of the jacket and
tube should be thoroughly rinsed with gasoline, wiped dry, and then
greased with liner grease.
10. Turning of Muzzle Brake 01-51 or 01745
.(fig. 1)
. Unscrew bolts 01-46 from the muzzle brake and with the. aid Of: a.
pinch bar screw the muzzle brake up to the stop in the muzzle face of
the barrel tube.
With themuzzle -brake screwed up to the top, the reference mark on
the end of the muzzle -brake should be located between the terminal marks
on the barrel tube.
Check whether there are burrs on the shanks of bolts 01-46.
PM. If there are burrs on the shanks of bolts 01-46 remove the
raised metal.
DARM. If the reference mark on the muzzle brake goes beyond the
limits of the terminal marks on the barrel tube, deepen the undercut
in the muzzle brake. to a depth of N and insert a spacer between the
muzzle face of the barrel tube and the collar of muzzle brake (sketch 2
and 3).
The size of N depends on the thickness of the spacer and should
not be greater than 203.5 mm for gun M746 and 253.5 for gun M-47.
The thickness of the spacer should be determined in the following
manner:
-- with a marking tool make a mark on the surface of the barrel
opposite the reference mark On the muzzle brake;
measure the distance a (along the curve) between the new mark
and the extreme right_mark on the barrel (looking from the sidE50X1-HUM
Muzzle brake);
-- determine the thickness Sof the spacer by the formula:
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6 2 + 0.019 a.
50X1-HUM
Fit the spacer so that when the muzzle brake is screwed up to tne
stop the prerence mark on the muzzle brake is located between (text
missing]
If a spacer has previously (during maintenance)been placed between (10 23]
the barrel and the muzzle brake, replace it with a new spacer made as
indicated in sketch 3. The undercut in the muzzle brake is not deepened.
11. Muzzle Brake Will'Not Screw Off Barrel Tube
PM. With a star gauge or special device (appendix 7) determine
whether the barrel tube has expanded in the section which connects with
the muzzle brake (Chapter Two, Item 4).
A barrel from which the muzzle brake will not screw off as a result
of expansion, but which is declared fit as a result of bore measurements,
may remain in service.
If it is impossible to screw off the muzzle brake even though there
has been no expansion, lay a rag soaked with kerosene on the place where
the muzzle brake connects to the tube, give the barrel a negative angle
of elevation and leave it in that position fora prolonged period of
time.
After this screw off the muzzle brake.
12. Dents and Cracks in Muzzle Brake 01-51 or 01-45
PM. Dents with depths up to 5 mm for gun M-46 ,and 10 mm for gun
NA7 are allowed in the Muzzle brake.
A muzzle brake having cracks and. dents of greater depths than
those shown above should be replaced.
13. Wear of Guide 01-12 of the Barrel Ring and
Guide 01-52 of the Breech Ring
(figs. 1, 3, 4)
With a clearance gauge measure the clearance a between the lower
surfaces of the barrel clamping piece and reinforcing plate 09-26 of
the cradle (fig. 1), and also clearance.b between the lower surfaces 50X1-HUM
of the breech ring and the cradle guide "(fig. 1). Clearance a should be
no greater than 0.8 mm, and clearance b no greater than 0.g mm.
?
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Preparation for insertion of spacer
flod8orpo8tra dpsi rIDCMC1H06HU r100ifIltlakU
;41=dal.(6-0.0)
cpattmuttecKa9
znyoutto 6b1MMIHU
do pemninna,
5- monigutia
nporcnailKu
_06pa6ornonit,
3anoanttito
IviaChi110 flush '
Insertion of spacer
flacmatima npoknathfu
50X1 -HUM
N1- actual depth
of undercut before
repair
6? thickness of
spacer
.upotfiladifo
01-51 unu 01-45 3pacer
Sketch 2.
0 1- I
Sb01 - barrel; 01-1 - tube; 01-51 or 01745 - muzzle brake
50X1 -HUM
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50X1-HUM
(oVera3.1)'
c79 5 KPYrOM
4-cparanuilecKuU euamemp
omaepcmor a dynbnom
mopmoae 01-5 unu 01-45
4) (Ai
true diameter
of aperture in
muzzle brake 01-51
or 01-45
ctIongamenbuo
npuznumb no mecmy
Fit to location
----Size-- --
A pm
For M-46 gun
178_
.5
For 11-47 gun
198_
.5
Material: steel 40x
Blunt sharp edges
Sketch 3. Spacer
50X1-HUM
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50X1-HUM
Next/measure the clearances between flange mit 10-65 and bushing
(fig. 3 )and between rod nut 08-53 (fig.4) and the breech lug.
To do this:
remove the breechblock wedge from the screw box;
(teXt missing] '
connect the Winch to the shield bracket;
-- elevate the tipping parts of the .cannon up to the cradle stop in
.the hinged .supports of the trails and 'Connect the winch chain to the:.
breech ring;..
-- using the winch, move the barrel forward slightly;
-- detach the recoil piston rod from the breech lug, and then, after
pushing up wedge detent 01-26, remove wafer-type lock 01-29;
place stop Sb09-15 (fig. 3):in theraveline position and, using
the winch, roll-the barrel off 20-30 mm. With a clearance gauge measure
the clearance between the protuberance formed by flange nut 10-65
and the groove in bushing 09742... The clearance should. be no less than
.0.5.mm;
-- roll the barrel off an additional 30-40 mm and with a clearance
gauge measure the clearance between aperture in the breech lug and the
wafer protuberances of rod. nut 08-53. The clearance should be no less
than 0.5 mm.
Take off the barrel and measure the tiiickness of the upper lip of
guide 01-12 Of the rings. The thickness should be no less than 2 mm.
Cheok for looseness of the guides; unsteadiness is not allowed.
PM. If the guides are loose, replace the weakened rivets.
AARM. If measuring shows that the thickness of the upper lip of
guides 01-12 is greater than 2 man, clearance a between the lower surface
of the barrel rings and reinforcing plate 09--2-6 of the cradle is greater
than 0.6 unt, and the clearances between flange nut 10-65 and bushing
09-42 and between rod nut 08-53 and. the breech lug are less than 0.5 mm,
It is necessary to:
50X1 -HUM
a) if the clearance in the junction of flange nut 10-65 and bushing
09-42 is less than 0.5 ma
p 26]
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kkimeiTIAt)
50X1 -HUM
. tkor.rz
cut?off gear
actuating collar,
View along arrow A
aud, ;x1 rincez.? 4
Sketch 4. Cradle
, Blunt Sharp edges
? 3(1;113 4, .:1141.1bK3
Section along: AA
Sketch 5.
Blunt sharp edges
...OZYTY.141.46' ? Dfl:',1-X.; (1,0.1L7Trin'a77:,
_
50X1 -HUM
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Oxcuauposamb Oxidize
3cit4,3 6. 01-29 -- 3am0x cyxapiluil
Sketch 6. 01-29 - wafer?type look
EIGetion along Alt
Paspe5 no 44
/50X1-HUM
Blunt sham edges
'Ocinpu,e peOix) npumyntons
Sketch
At
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50X1-HUM
-- tool the semi-aperture and deepen the groove of the cut-ofl
gear actylating collar (sketch 4): .
-- tool the semi-aperture in bushing 09-42 for stop 09-48
(sketch 5);
b) if the clearance in the junction of rod nut 08-53 and the breech
lug is less than 0.5 mm:
-- machine the .outer surface of wafer lock 01-29 and cut an oval hole
in the breech lug (sketches 6 and 7)
replace key 08-55 (fig 4) of the rod nut (appendix 1, sketch 214).
After performing the specified work, place the barrel on the cradle
and cheek' th6 connection of the recoil piston rod with the barrel and the
recuperator rod with the cut of gear actuating collar of the cradle.
With the rods connected to the barrel and the gear actuating collar, try
the operation of the elevating mechanism and [text missing]
Also check whether stop 09-48 (fig 3) fits in the semi-aperture of Ep 27]
bushing 09-42 when stop Sb09-15 is in the travelling position.
If the stop does not fit, adjust the length of forward rod Sb09-16.
FPARM. If measuring shows that the thickness of the upper lip of
guides 01-12 is less than 2 mm, or the clearance a is less than 0.8 mm,
or clearance b is less than 0.6 nal, replace guide-s- 01-12 and 01-52 (chart
2).
14. Looseness of Stop 01-17 of the Breech Ring, Causing
Turning of the Breech Ring in Relation 'to Jacket 01,-12
(fig. 1)
PM. Check for looseness of the stop by tapping lightly with a
hammer. If it is loose, screw up screw A51060-57 as far as possible
and center it in the slot.
With a clearance gauge measure the lateral clearances between stop
01-17 and the walls of the grooves Of the breech ring- and jacket.
The sum of the clearance on both sides in the. junction of the stop
and-the breech ring and also the sum of clearanceS on both sides 5-50X1-HUM
the junction of the stop and the jacket should be no greater than u,4)
ram.
st
If the clearance is larger, the barrel is subject to repair at a
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Chapter Three
Maintenance of the Breechblock 50X1 -HUM
1. Zhe Breechblock is not Secure in the Closed Position.
.(fig. 2)
: With the breechblock closed, attempt to pull the breechblock lever
Sb02-2A right 'without pressing down on the lever handle grip 02-9. The
breechblock lever should not pull.
Causes for malfunction:
a) A break or spring fatigue of spring 02-8.
With the breechblock closed, press down on the lever handle grip
02-9 and release. The action of the spring should return the grip to
the original position. At the same time, the cog of the lever detent
02-7 must engage the lever catch 01-30.
PM. If the grip does not return to the original position, replare
the spring with one provided by DMA (chart 3).
b) A jamming of the cog of the lever ttop 02-7 with the lever
catch 01-30 (1 in figure 2) in the coupling.
WPM. Build 1110 a layer of metal on the lever, stop cog and on the
lever, catch tooth utilizing an electrode, type EN-401 and machine them
(sketches 8 and 9).
2. The Breechblock Does not Qpe.
Try to open the breechblock by elevating the barrel at different
angles. The breechblock must open smoothly without jerking.
Causes for malfunction:
, a) The wedge Stop 0126 won't fully retract from the opening in
the breechblock wedge due to a break or spring fatigue of spring 01-27
(figure 1),
With the wafer-type lock 01-29 fully joined with the control rod,
press down with any type of nipple on the catch of the stop 01-26 and
attempt to open the breechblock. If the breechblock opens, this indi-
cates spring fatigue of spring 01-27. Measure the height of the uncom-
pressed spring. The height of the spring must be not less tha5ox 1-HUM
Note: On guns of original issue, a new spring in the uncompressed
position conforms to a measurement of 102'.-1 5 inia.
28]
(p 29]
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2 .03
2
1 30
3eKanurnb 35-45.R c Temper 35-45Rc
oncoarnamal sonadriato Machine flush
.. . .. . ? _
P6
1
\A
50X1-HUM
06paoornarno Janorkzuo
Machine flush Orinave Pe6P6 mumgnuma Smooth sharp edges?
OxcuOupowalb Oxidize .
3,3143 02-7s. cror,np
Sketch 8. 02-7 - lever stop
50X1-HUM
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Ceiva rto.v.
Cross section AA
12
? 3afrolturnt) 4,5-50kt
Temper 45-50Rc
50X1-HUM
Machine
..j5 60' ? flush
05P,Oarnarr''' Machine
-lant"4'1:4? flush
30013
?
0.5x601770411, Machine
saricesotio flush
SmoQth sharp edges
Ocmpbo petipa nr4.ii7vurn
excuckirodcint, Oxidize
9. 01-30 --KpiotiOi: pyoH TKU.
Sketch 9. 01-30 lever stop
50X1 -HUM
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
? RM. If the wedge stop 01-26 does not fully retract from the opening
inthe breechblock wedge due to spring fatigue or because it is broken,
replace the spring with one provided by DARM (chart 3). 50X1-HUM
b) The wedge stop 01-26 projects.over the lower surface of the
wedge slot of the breech ring when the breechblock is open (figure 1)..
PM. In the absence or after the elimination Of the cause of the
malfUnction indicated in Item "a" (see above), check the amount of stop
? projection with a rule. While in the projected position, trim the upper
..end of the stop flush with the lower surface of the breech ring housing
and take down the edge 1?5;X 45 degrees on the upper end of the stop'.
c) The cocking lever Sb02-4 does not return to the original
(forward) position after release' due to a break or elongation of spring
02-19 (figure 2).
. Check whether the cocking lever Sb02-4 returns to the original
(forward) position after release.
? : PM. If the cocking lever does
replace the spring (appendix 1).
d) Jamming of the breechblock
(figure 2).
not return to the original pOsition,
wedge due to shell case expansion
Place the cocking lever Sb02-4 in the forward position, if it is
in another position. :
Press down on the handle grip 02-9, then turn the breechblock lever.
Sb02-2A right rearward. At the same time, strike the wooden extension
on the tray of the wedge with a hammer and open the breechblock.
Extract the jammed shell case with a hand extractor or force it
[out] from the case.
? 'Check
the facing
shell case
chamber of
close, but
engage the
the clearance between the breech face of the barrel tube and
of the breechblock wedge. To do this; insert a flaw-detection
which has a flange with a thickness of 7.2-0.05mm in the
the tube and close the breechblock. The breechblock must
not completely-- the cog Of the lever stop 02-7 must not
lever catch 01-30.
If .a flaw-detection shell case is not available, insert a spent
shell case (with a non-protruding bottom) in the chamber, having
measured beforehand the thickness of the flange. Close the breechwinnlr-
With a clearance gage measure the clearance between the flange of 50X1-HUM
case and the facing of the wedge.
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The overall thickness of the shell case flange and the clearance
measured with the clearance gage mutt not be more than 7.2 mm.
AARM. If the-breechblock closes with the flaw-detection 50X1-HUM
case inselted in the chamber, then the clearance between the breech .
face of the barrel tube and the racing of the wedge is more than 7.2 nm,
and the gun needs to be repaired:at the stationary repair organ.
3. The Projectile Retainer 02-38A (02-38) Does not go Into the
? Working (Upper) Position.
(fig. 2)
Causes for malfunction:
a) Bending of the retainer pivot 02 41 (on guns of original
issue ).
Loosen the retainer pivot from the breechblock wedge, and check
with a rule whether the pivot is bent.
DARM. If it is bent, replace the retainer pivot (appendix 1,
sketch 205).
b) A break or spring fatigue of Spring 02-39.
Open the breechblock.
Press down on the projectile retainer and release.
The projectile retainer, under the action of the spring, must
immediately return to the upper. position.
PM. If the projectile retainer does not return to the upper
position, replace it with a spring provided by DARM chart 3).
4. The Breechblock Does not Close or Closes With Difficulty.
(fig. 2)
'Put a regulation shell case it the chamber of the barrel and test
close the breechblock with .different ? elevations of the barrel. The
breechblock must close without jamming. ,At the same time, the breeck-
block must close completely.
.Causes for malfunction:
issue).
'A. bending- of the retainer pivot 02-41 (on guns of 0r50X1 -HUM
1331]
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, Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
See Chapter III, Item 3, ".
b) A bending of the lower extractor 02-33A (02-33) and the u
PKTX1-HUM
extractor 02-34A (02-34).
, PM. When the breechblock closes with difficulty, locate the places
where the extractors are sticking and trim the extractors in those?
.
places.
If bent extractors impede the full closing of the breechblock,
replace the extractors (appendix 1). ?
5. The Inertial Safety Catch 02-31 Does not Lock the
Breechblock in the Closed Position.
(fig. 2)
Close the breechblock. and attempt to open it Without lowering the
inertial safety catch. The .breechblock must not open.
Causes for malfunction:
a) A. break or spring fatigue of spring 02-12.
Remove the breechblock wedge from the breech ring housing. Push
down the inertial safety catch in the wedge slot and release it. The
inertial safety catch must immediately return to the original position.
PM. If the inertial safety catch does not return to the original
position, replace the spring with one provided by DARK (chart 3).
b) A distortion of the projection of the inertial safety catch
02-31.
DARM. Build up a layer of metal on the projection of the safety
catch. 'Build up the layer with an electrode, type EN-401 and machine
it (sketch10).
6. The Switch 02-42A (02-42) Does not Return-to the
Original Position.
(fig. 2)
Causes for malfunction:
[1.3 323
a) Burrs on the tip of the set screw (A51064-2) and on the walls
of the groove of the switch (02-42), which impede the free movernerr5oxi -HUM
the switch (02-42) in opening the breech ring (on guns of initial issue).
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Smooth sharp edges OcmDtve petpa npumynumo
Temper 35-45Rc 3?Kainia 35-45A
Onuduvosamo
Oxidize
aCKH3 10. 02-31? npeaoxpainiTe.nb HE1ep-
4HOHHUA
Sketch 10. 02-31 - inertial safety catch
50X1 -HUM
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PM. When there are burrs on the walls of the groove of the switch,
clean out the groove, at the tAme time allowing an increase in the width
of the groove up to 8.5 mon.
50X1-HUM
When' there are burrs on the tip of the set screw or if the tip is '
bent, replace the set screw (appendix 1 sketch 206).
b) A break or spring fatigue of spring 02-12.
Open the breechblock. Press firmly on the head of the switch
02-42A (02-42) and release. The switch must return to the original
position.
? PM. If the switch does not return to the original position, re-
place the spring with one provided by DARM (chart 3).
7. The Inertial Safety Catch 02-31 Does not Disengage.
(fig. 2)
Close the breechblock. By means of switch 02-42A (02-42), dis-
engage the inertial safety catch and check whether the breechblock
opens. The breechblock must open.
Causes for malfunction -A break Or spring fatigue of spring 02-26.
Remove the breechblock wedge from the breech ring housing.
[p 33]
With one hand press the inertial safety catch 02-31; and, while
holding it in the pressed position, with the 'other hand press firmly
on the safety latch 02-32 and release. The safety latch must immedi-
ately return to the original position.
PM. If the latch does not return to the original position,
replace the spring with one provided by DARM (chart 3).
8. The Firing Pin Does not Raise and Does not Come Down.
(fig. 2)
With the breechblock closed, pull the cocking lever a02-4 out as
far as possible, and, keeping the lever in this position, check whether
the striker point protrudes beyond the facing of the breechblock wedge.
The striker' point must protrude beyond the facing of the wedge.
Release the lever 3b02-4 and check with a metal rule whether or
not the striker point protrudes beyond the facing of the breechbl5oxi -HUM
wedge. The striker point must not protrude beyond the facing of the
wedge.
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9-1-00081-00Z1-?0V917Z00108d01-V10
-3610,2 -
Machin
flush
0Oproorna
cNi JunoOfitio
oi
0
? The connection of radii .7 and 15 should be
?C011,0WHUO 017011(/CO3 7 ti ,!5 rifiANC110 thaTOOUR7OC? A
Mg/lbWOUUCHRVV8 located on the line Of celiters ? .
Ycmyn 8 conpsocektuu nodwicod HE 00nyCHC1CMCS
A recess at the point of radii connection
is not permissible.
3CR113
46?0,2
flachine
flush.
301(017UMb
40 -50 R c
Temper.
40-50Rc
00-?at5amamb
Conpw papa npurnunumb Smooth Sharp edges
&a/di/pow/rib Oxidize.,
L C092-4 p Li r 313 0;t a : 02-20. p biaa r 133130A a
Sketch 11. Sb02-4 - cocking lever; 02-20 - cocking lever
oi
0
CIA-RDP80T00246A031200180001-5
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Repeat the indicated check 4-5 times.
Causes for malfunction:
50X1 -HUM
a) 4fter release, the cocking lever 0002-4 does not return to the
. original (forward) position due to a break or elongation of the spring
02-19.
? See Chapter ItI, Item 2, "c."
b) A. break of the firing spring 02-29.
PM. Replace the firing spring (appendix 1).
c) A break or spring fatigue of spring 02-26.
? Remove the firing mechanism from the breechblock wedge. Push aside
the cocking piece 02-24 so that the side surface "a" of the cocking piece
is located approximately flush with the formed cylinderical surface of
the firing pin 02-27A (02-23), and release the cocking piece. The action
of the spring must immediately return the cocking piece to the original
position.
PM. If the cocking piece does not return to the original, position,
replace the spring with one provided by DARM (chart 3).
d) 'Wear at the junction of the short arm of the, cocking lever 02-20
with the upper projection of the tension [shaft].
DAR. Build up a layer of metal on the short arm of the cocking
lever and on the upper projection of the tension shaft. Build up the
layer of metal with an electrode, Type EN-50, and machine it (sketches
11 and 12).
9. Misfires.
(fig. 2)
Causes for malfunction:
kbreak, bending, or settling of the striker point 02-27A or
the striker point (02-27) on guns of original issue.
Check the travel of the striker point over the facing of the breech-
block wedge. In order to do this:
Remove the breechblock wedge from the breech ring housing;
50X1-HUM
Remove the striker cover 02-30 and the firing spring 02-29 from
the-wedge slot;
353
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Machine
flush
50X1 -HUM
The connection of. radii 32 and S'should
be located on the line of cente*.
A recess at the point of radii cOnnection
is not perndssable.
(on, v)eetilie ZIO411/C:68 ',. 3 2 ti 5Oor.rt;9 r ,
:__ , -Machin&A?rogtirincirb
iraze(iiil:rtoca ?fa It'w-tati 1-4eifrnPud \ . I .:
.:
? .
flush'i \ 3
lefn
.fUn t c'of7p-,voce' iwu : ,a'aii:74:0-e3 % ? ?!,i ?
He don0,-ticernai :.''. .'1
DN
P2
1.1177b ?.%t.; R
Temper .45-55Rc
Smooth sharp edges
OC 17;12 C'DuLm
CLC-1,006,..7177:"
Oxidize.
12 62 i 7 ? 1.1 l?irt-,-;
Sketch 12. 02-17 - tension shaft
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'1urn -me cociang lever 5b02-4 as far as possible; and without re- ?
leasing it, push the firing pin forward to the furthest forward position.
Check the travel of the striker point witha.regulation template
50X1 -HUM .
The pormal travel of the striker point is from 2.3 to 2.7 mm.
:PM. When there is a break, bending, or settling of the striker
point (02-27)0 replace the firing mechanism Sb02-5 with a spare
(appendix 1).
DARM. When there is ,a break, bending, orsettling of the striker
point .(0227), replace_the striker,point1(02-27) and key 02-28 .
(appendix 1,0ketches/203 and 204).
Arrange the set-Up of the Point and key in the following order
(sketCh 13):
-- insert the firing pin (02-23) cocking piece (02-24); pin 02-25,
and spring 02-26;
--. screw the [striker] point tightly in the firing -pin;
-- drill and expand the opening 0.5.5 t 0.3 in in the [striker]
point and firing pin through 'the opening in the firing pin;
--.press thekey 02-28 as far as possible in' the opening of the.
firing pin;
? machine the [striker] point and the projecting part of the key
flat.
b) Abreak or spring fatigue of the firing pin spring 02-29.
If no break in the spring is found, put in another spring suitable
for checking purposes, and ascertain whether the primer is hit. If
the primer is hit with the newly installed test spring, this indicates
spring fatigue of the spring being checked.
If a suitable spring is not available [for test purposes),
determine spring fatigue by the height of the spring.
The height of the uncompressed spring must not be less than 50 mm.
FM. Replace the spring if it is broken or there is spring fatigue
(appendix 1).
c) Eccentricity of hits of the striker point 02-27A or the
striker point (02-27) on guns of original issue.
Check the position of the impressions of the striker point on
the primer cup. To do this:
ID 373
50X1 -HUM
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cm
.13 13. . (02-23) ? .y.qaploiK; 09-9-1? KypoK; . .02-25 ---- cioliom; 02-26 ---- lipyA;itna; (02.-27)--- GoeN
_. 02-25 ? III UOitlia .
2 Sketch 13. (02-23) - firing pin; 02-24 - cocking piece; .02-25-- catch;
C - ? 02-26 - spring; (02-27)? striker pin; 02-28 -. key .
Cross section
&tow no AA
A r-
(02 -28
102-271
,AL
. boot( 86 1'17 C :17MSPatt.
&CV) He dOrlyChiliff lrfi ?
1c3pe3 no fib
Section across BB
?
?
II ' ?
102 -231
Screw the firing pin in tightly;-
a gap is not permissible
?
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M.1110
screw a spent primer cup from a shell case;
screw the anvil and cuplet from the primer cup;
? ,Check the impression on the primer cup with ?regard to the
spacing of the hits in the primer cup cavity. After that, trim the
end of the cup;
50X1 -HUM
.screw the primer Cup in the eye Of the shell case;
? Note': When a primer cup is not available, it .i permisSible to
seal the eye in the shell case for the primer cup with .wax.
V
-- put the shell case in the chamber of the barrel and close the
breechblock;
^ with hand pressure applied to the tray of the breechblock
wedge, move the wedge to the right as far as Possible and release
the firing pin;
-- open the breechblock, turn the shell case 180 degrees and close
the breechblock;
-- Once again, with hand pressure applied to the tray of the breech-
block Wedge, move the wedge as far right as possible and release the
firing pin;
- remove the shell case and measure the distance A between the
contact impressions of the striker point (sketch 14).
The distance A must not be more than 6.5 nm.
AARM. When the distance A is more than 6.5 ram,. reduce the ovalness
of the pin of the breechblock lever arm 02-1A by removing a thin layer
of metal. Replace the slide 02-5A (02-5) and the slide catch 02-36 and
clean out the groove for the slide in the wedge (chart 4).
An increase in the width of the groove up to .145 nm is permissible.
When replacing the slide 02-5A (02-5), machine the end
missing].
13417t r1150k1-HUM
?
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50X1 -HUM
11-ipatcmuL4ectfa2 umpuna nom 8
Jarnsapo 110C.Pe pacqucrnid
Iwo
L3arc/17u 76 35 Pc
,.?.
?crappie peOpo npuragnumo
Omcudupodomp
-H-the actual'vidth of the groove Smooth sharp edges ?
in the breechblock wedge
after clearing the groove..
Qxidize
Sketch 15. 02-18 - intermediate safety catch
*10. The Cartridge Case Does Not Eject
The malfunction appears during firing.
?When there is an unfired calibrated cartridge, ,check the ejection
of the cartridge with the breechblock opened. The cartridge case should
eject energetically.
? Reasons for the malfunction:
a) Dilated cartridge case (during firing).
PM. Extract the cartridge case from the chamber using a hand
extractor or push it out fram the muzzle end.
b) Claws on lower extractor 02-33a (03-33) and upper extractor
02-34A (02-34) are broken (3 in fig: 2).
PM. Replace the extractors (appendix 1).
50X1 -HUM
I:103u
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Chapter Four
Maintenance of the Cradle
EP 39]
50X1-HUM
1. Stop Sb09-15 Does Not Hold in Traveling and Combat Positions
(figurq ,3)
Stop Sb09-15 should hold the lever. =mechanism in traveling and
combat positions.
Reason for the malfunction: A break or fatigue in spring 19-437.
Set stop Sb09-15 in traveling or combat position.
Pull back stop 09-68 by cap 09-65 and release. The stop should
quickly return to initial position.
PM. If the stop does not return to initial position, replace the
spring with one made at'DARM (chart 3).
? 2. Bushing with Bracket Sb09-10 is not Checked by Stop 09-48 When
Stop Sb09-15 is Set in Traveling Position.
(figure 3)
The malfunction can be exposed by setting the barrel in traveling
position or by detaching the barrel from the cradle.
Recess stop 09-48 and switch stop Sb09-15 from traveling position
to combat position. Then witch stop Sb09-15 into traveling position.
By doing this, stop 09-48 should enter the semi-aperture of bushing
with bracket Sb09-10 and check it.
Reasons for the malfunction:
a) The length of forward rod Sb09-16 is not adjusted.
When stop Sb09-15 is in traveling position, the semi-aperture in
bushing with bracket Sb09-10 should be aligned with stop 09-48.
EA. If the semi-aperture does not align with the stop, turn lock
nuts 09-72 and 09-137 several turns. Align the semi-aperture with the
stop by rotating adjusting screw 09-73 in either direction. After
adjusting, fasten the adjusting screw with lock nuts. 50X1-HUM
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
b) A break or fatigue in spring 09-47. [p 4o]
With stop Sb09-15 in traveling position, press down stop 50X1-HUM
hand and/release. The stop should quickly return to initial position.
? PM. If the stop does not return toinitial position, replace the
spring with one made at DARM (chart 3).
When Stop 5b09-15 is Set in Traveling Position Rod Sb09-30 is not
Checked by Stop 09-93.
(figure 3)
With stop Sb09-15 in traveling position try to pull the tappet
back. The tappet should not move.
Reasons for the malfuction:
a) The length of rear rod Sb09-17 is not adjusted.
Bevel 2x45
only for
N2 washers
/?" ,?/ /
1 cif
cD
Material: steel S,b3 f 3
Smooth sharp edges
MeL-eureieht'e'in mm.?
Waah.r- ? d
? ?
21,64" 3-t? .
? 2 - ?3L .21,5+04 . 5
40-07 25-# `;"!!"
C2 4.6407 ;i1?.o. ci4rts 4,2
!, 1 C j :
7.5"(100'
Sketch 16. Washer
50X1 -HUM
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EA. Regulate the rear rod with stop Sb09-15 in traveling position
and rod Sb09-30 in extreme forward position.
50X1 -HUM
Uhscrew lock nuts 09-72 and 09-137 several turns. By rotating
adjusting screw 09-73, adjust the length of the rear rod so that stop
09-93 enters the rod aperture and checks it but does not interfere with
the free movement of the rod when stop Sb09-15 is in combat position.
After adjusting, fasten the adjusting screw with lock nuts. [p 41]
b) A break or fatigue in springs 09-85.
? With stop Sb09-15 in combat position, pull rod Sb09-30 into an
extreme rear position and release it. The rod should quickly return
to the initial position.
PM. If the rod does not return to its initial position, replace
the springs with ones made at DARN (chart 3).
When there is fatigue in the springs, washer No. ,l (sketch 16) can
be placed, between the spring and pivot 09-82.
c) A break or fatigue in stop spring 09-95.
With stop Sb09-15 in traveling position, pull stop 09-93 down and
release it. The stop should quickly return to its initial position.
PM. If the stop does not return to its initial position, replace
the spring with one made at DARN (chart 3).
4. When Stop Sb09-15 is set in Combat Position, Stop 09-93 Hinders the
Free Movement of Rod Sb09-30.
(figure 3)
Reason for the malfunction: The length of rear rod Sb09-17 is not
adjusted. See Chapter 4, item 3, a.
Difficulty is Switching Stop Sb09-15 from Traveling Position to Com-
bat Position when the Recuperator is Detached from the Cradle.
Return the barrel to an extreme forward position by means of the
winch.
Switch stop Sb09-15 from traveling position-to combat positio 50X1-HUM
conversely. One man should. be able to switch the stop.
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Reasons for malfunction:
a) A break in the welded joint Connecting handle 09-208 t50X1-HUM
09-64. (fig. 3)
? PM. Detach stop Sb09-15 and rear rod Sb09717 from leiter 09-64'.
Sever the welded joint from the surface of the lever and handle and weld
the handle to the lever with electrode E42 (sketch 17).
b) The clearance between the:bearing surfaces of the protuberances
of bushing with bracket Sb09-10 and flange tut 10-65 (fig, 3) is not
adjusted.
Remove cover 09-146.
Place the arm on the limber and connect the winch chain to the
breech ring.
With the barrel in an extreme forward position, pull the barrel for-
ward, turning the winch handle with a force of 20 - 55 kilograms.
[text missing]
PM. If the clearance does not fall within these limits, take cap
Sb10-20 (10-125) (fig. 5) and, either loosening or tightening 1p 43]
regulating bolt 10-120, adjust the clearance so that it falls within
the limits of 1 - 2 mm. ?
After adjusting, mount cover 09-146 and cap Sb10-20 (10-125) i
place.
A Bend or Break in Rod Stop (09-27) In Guns of Initial Issue.1
[Trans. note: footnote missing]
? (figure 3)
PM. Straighten bend in stop by heating.
DARN. When there is a break, replace the stop (appendix 1, sketch
216). To mount a new stop on cylinder Sb09-51 it is necessary to:
0
--set up a releasing block mechanism and adjust it;
--place stop Sb09-15 in combat position;
--mount stop (09-27) on cylinder Sb09-5 and set it so that there is
a gap of 3 mm between the stop and buffer disk (08-49) (fig. 4). With
the stop in this position, mark out an opening in the stop (for cotter
pin A51043-9), corresponding to the opening in the cylinder, then
drill and ream an opening in the stop and cylinder (sketch 1Q).
50X1 -HUM
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W 5 OCTA.17bil0E
Tor the reg?.7?)(1e.-
1!
TeaMot-
3CMCLITIIMb 40-45Rc .
10
3C1;113 17. COI..;9-3,9 ? RbItiar c pyKowr?
KOIU 09-6-; pbitiar; 09-203
Sketch 17 17. Sb09-38 - lever arm
mechanism; 09-64 - lever;
09-208 - handle.
3c.pal3
160
Mamepuon: cmafie 50 rriate.;01; Sieoi
Ocmpoio .peopa ? npumyniimb Sp1.17 dia.? E;(-ieY
Sketch 18. Pattern
ininH-1,X09
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A510.0-9.
-
lC'27)
ICW
Angle of t'aper. 1:50.
:::".i \ . \
. \ i
1 1 ' \
--.-. -I--- % 1
\j - ? --) \I -
? -/ ? 1 't`'-;:'_-,7i
-50X1-HUM
Sketch 19..(09-2/) - rod stop; Sb09-5 - cylinder; A51043-9 - cotter pin
. --insert cotter pin A51043-9;, it should not protrude more than 3 mm.
If the protrudance is longer, cut off the end of the pin. 1p 443
Dents, Holes and Cracks in the Cradle
Dents in the cradle are permissible if they do not hinder the free
Movement of recoiling parts, the normal operation of mechanisms, or
disassembly and assembly.
Cracks in the trunnion yoke in the areas between the trunnion and
the yoke are not permissible. ?
AARM. Veld cracks in the cradle frame with a length of no more
than one tenth of a perimeter of a cross section of the frame with elec-
trode E50-A, having first drilled openings with diameters of 3- 6 mm
around the ends of the cracks.
When there are longer cracks, after welding them, weld on reinforced
steel plates of any quality with a. thickness of not less than 6 nm to
provide the necessary strength.
Close up all holes in the cradle by welding on plates. 50X1-HUM
41. ?
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Sizes and configuretions of reinforced plates welded on by the
repair shop depend on the places where the cracks and holes ere :50X1-HUM
50X1-HUM
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Chapter Five
Maintenance of the Recoil System
(figure 4)
-fp
50X1 -HUM
1. Oil Leakage From the Recoil Brake and Recuperator
Remove forward cradle cap.
Artificially recoil the barrel 450-500 mm and check whether oil is
present on the recoil piston rod and recuperator rod. Also, check whether
oil is leaking through the sealing rings, valves, or stuffing of the
throttling rod.
After checking, put the cradle cap back in place.
Reasons for the malfunction:
In the recoil brake:
a) The recoil Piston rod stuffing is insufficiently tightened by
stuffing nut 08-7 (fie. 4).
PM. Tighten the stuffing. If the leak does not Step, add more
stuffing or replace the stuffing (appendix 1).
If the leak does not stop even after replacing the stuffing, then
the reason for the ,leak may be wear of the apertures for nut bushing 08-8,
ring 08,5, or babbitt lining of washer Sb08-13.
In this case, send the cannon to a higher maintenance shop.
AA. Measure the diameters of the apertures for the bushing, ring,
and babbitt lining and the outer diameter of recoil-piston rod 08-12.
The difference of the diameters in each junction should be no more than
1 mm.
If there is wear of bushing 08-8 (the difference of the diameters is
more than 1 mm), remove the bushing, make a new bushing (appendix 1,
sketch 208), and press fit it into stuffing nut 08-7. In order to
eliminate the possibility of jamming the rod in the bushing (after
pressing), it is permissible to scrape the inner surface of the bushing.
[text missing
50X1 -HUM
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If there is wear of the babbitt .lining (difference Of diameters rip 46]
in the junction is more than 1 mm)) line the washer with a new b50X1-HUM
brand IF, and work it around the rod (sketch 20).
After extracting the old babbitt lining solder the inner surface of
the washer With P09-30 solder.
b) Compressed or insufficiently tightened sealing rings 08-45.ty
screws 08-47, 08.773 by serew 08772, and 28-9 by nut 08-11 (Fig 4).
Check whether oil is leaking 'roin under forward cap 08-23) screw
08-q2lor stuffing box 0872.
PM. If there is oil leakage, tighten the sealing rings. Tighten
staling ring 08-45 by gradually screwing in diametrically positioned
screws 08-47 (in pairs).
When it is necessary to tighten sealing ring 08-9, the following
steps should be taken:
--place the pattern (sketch 21) in the groove of nut 08-11, in which
buffer disk key 08-50 is located, and mark two lines by the pattern on
the outer surface of the recoil cylinder;
--screw on nut 08-11 and tighten sealing ring 08-9. With this, bring
one of the grooves of nut 08-11 in Line with the graduation lines marked
on the recoil cylinder which is controlled by the pattern.
To accomplish alignment of the groove of the nut with the graduation
lines, it is permissible to tamper the forward end of nut 08-11.
If the leak does not stop after tightening, replace the sealing
rings with ones made at DARM or. AARM (appendix 1, sketch 209).
c) Valve cone 08-48 does not-fit tightly in seat in forward cap
08-23 (4 in fig 4).
Check whether oil leaks in the junction of. valve cone and seat in
'forward cap. ' ?
' PM. When there is oil leakage, correct the valve cone by abrading or
replace the valve (appendix 1, sketch 213).
. ' DARM. When there is oil leakage, trim the bottom of the seat in the
forward cap by countersinking and correct the valve cone by abra(14--
. 50X1 -HUM
If there is oil leakage even after this, replace the valva (appendix
.1,:sketch..213). -
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n'o- 171 177_,
50X1 ?HUM
tt"
i
1
21. Patte
-c
F-1
a>
CO
0
f)e.o[ia npuinuntirno
,?,) ?
50X1 ?HUM
s,
-44 ??...
?
V.)
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d) Damage (tears, -cracks) to collars 08-4 and 08-104, leather. rings
08-103, rubber ring 08-102, or wear of collars 08-4 and 08-104 (f150X1-HUM
?M. tRePl ce faulty collars and rings (appendix 1).
? In the Recoil Mechanism
e) Stuffing 10780 is insufficiently tightened by stuffing nut
10,-81 .(fig 5).
[text missing)
If the leak does not stop even after replacing the stuffing, then p 48]
the reason for the leak might be wear of the apertures of nut bushing
10-22, ring 10-79, or babbitt. lining of washer'Sb10-8.
Measure the diameters of the apertures of the bushing, ring, and
babbitt lining and the outer diameter of recuperator rod 10-32. The
difference of the diameters in each junction should be no more than
1.2 mm.
If there is wear of bushing 10-22 (the difference of diameters in the
junction is more than 1.2 mm), extract the bushing, make a new bushing
(appendix 1, sketch 223) and press fit 'it. into nut 10-81.
. After press fitting, force the bushing aperture around the rod (sketch
22).
When there is wear of ring 10-79 (difference of diameters in the
junction is more than 1.2 mm), replace the ring (appendix 1, sketch 225).
If there is wear of the babbitt lining (difference of diameters in the
junction is more than 1.2 mm), line the washer with a new babbitt, brand
BN, and force onto the rod (sketch 23). After extracting the old babbitt
lining, solder the inner surface of the washer with solder P05-30.
f) Sealing rings 10-25 and 10-53 are compressed or insufficiently
tightened by screws 10-27 (fig 5).
Check whether oil leaks from under stuffing box 10-75 ,,nd operlting
cylinder 10-4.
?
PM. When there is oil leakage, tighten the sealing rings by
gradually screwing up t;le diametrically positioned screws 10- 27
(in pairs).
50X1-HUM
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If the leak does not stop even after tightening, replace the
sealing rings with ones made at DARM or AIM (appendix 2,, seokid-rua ?
g) /Sealing rings 10-107 are insufficiently tightened by nut 10-109
(fig 5).
Unscrew lolug 10-110 and check whether oil leaks from under the
Sighting glass 10-10i
PM. When there is oil leakage, tighten the sealing rings. Clearance
b (fig 5) of no less than 0.5 mm should be left between the outer end
of the sighting glass and gasket 10-105.
If the leak does not stop even after tightening, add one more sealing
ring or replace all sealing rings (appendix 1).
When adding the additional ring or replacing all the rings and after
tightening the end with a nut, clearance b should be within the limits
of 0.5 - 1.5 mm.
h) Valve 10-57 does not fit tightly in the seat in rear cap 10-2
(5 in fig 5).
Check whether oil leaks in the junction of the Valve and seat in the
rear cap.
PM. When there is oil leakage, correct the valve cone by abrading
or replace the valve (appendix 1, sketch 224).
IRM. When there is oil leakage, trim the bottom of the seating in
the rear cap by countersinking Or boring with a flat pointed end (text
,missing]
If the leak does not stop even after this, replace the valve (appendix
1, sketch 224). [10 50]
i) Damage (tears, cracks) or wear of collars 10-77 (fig
PM. EXamine collars 10-77.
When there is damage or wear, replace the, collars (appendix 1),
Also examine collars 10-83 of the recuperator piston rod.. When there
is damage or wear of the collars, replace them (appendix 1).
5).
50X1 -HUM
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A - Hmut ecAver HM160176121111:I
- 81
01.101efe/77p 1111770HO /0 -32
Ompb10 peopa liplilnynUfilb
' 30043 22. 10-22-- rsTy;igJ r:iiiKii; //)-8/
c;1..naniva
0-6-cioa,/ s) dial-be/et'
er eog`" lo -32
Sketch 22. 10,22 .7. nut bushing; 10-81 - stuffing nut
finootim
814 .
50X1 -HUM
-:--
-----4-- A ipottmut-ityKiii Houtio.Rpt.uou
?
. digiA?lerrip ? winoto. -32
. Q.1 -rod 32
'Cr?
1
Nina-Putt()
ilackine
Ocirijmio npuryntirob
S17sha,r, edaes
3cio3 23, C610-8
Sketch 23. Sb10-8 - washer
50X1 -HUM
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0i1 Leakage Through Valve 10-57 with -the Required qUantity of
Oil in the ReCuperatigure 5) - 50X1 -HUM
Reason for -the malfunction leather ring's 10-54 are insufficiently
tightened by nut 10-55..
PM. Loosen lock nut 10-56 and. tighten-the ?rings with nut 10-55.
If the leak does not stop, replace leather rings 10-54 (appendix 1).
3. Oil Leakage FromRecuperatorThrough.packing, Sealing
.Ring 10-115 and Ring 10-127 When the Barrel is ArtifiCially
Recoiled
(figure 5)
Reasons for the malfunction:
a) Packing 10-117 iS insufficiently tightened by nut 10-119.
PM. Tighten packing. .If the leak does not stop, add packing or
replace packing (appendix I),
b) Damage (tears, cracks) to sealing. ring 10-115 and ring 10-127.
PM. Replace faulty rings (.:.1ppendix 1),
4. Air Leakage (Nitrogen) From RecuperatOr
(figure 5)
Give a maximum angle of inclination to the tipting parts of the gun
and wet valve nut 10-55, plug 10-58, and sighting hole plug 10-.110 with
soapy water.
The appearance of bubbles indicates leakage of air (nitrogen) from
the recuperator.
Reasons for the malfunction:
a) Sealing ring 10-107 is insufficiently tightened by nut 10-109.
PM. If there is air (nitrogen) leakage through the sighting hole,
screw out plug 10-110 and tighten sealing rings. Clearance b (fig 5) of
no less than 0.5 mm should be left between outer end [text mrssingl
and sealing ring 10-105.
50X1 -HUM
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If the leak does not stop avenafter tightening, .add
sealing ring or replace allsealing'ringsjappendix 1)..
Afte4. adding an additional_ring or replacing all the
tightening the rings with the nut, clearanee 12. should be
of 0.5 to 1.5 mm.
one mere (p 511
? 50X1 -HUM
rings and after
within the limits
b) Tube 10.-63 is not filled with oil
PM. When there is a leakage of)air:(nitrogen) through valve 10-57,
screw out plug 10-58, give the tipping part .6fthegun an angle of eleva-
tion of 6 7 10 degrees and wiscrev Vave.10-54 a, quarter of a turn When
oil appears In the aperture for plug 10-58, quickly close the valve. A
hydraulic sealing of air (nitrogen), in the-recuperator is achieved as a
_
result of this.
5. Extended Recoil
(When the angle of elevation is from -2?30' to +20?, the length of
recoil is more than 1320 mm; from,plus'340 toplus_45?, the length of
recoil is more than 815 mm),
The length of recoil,is determined,during firing or is established
by recerds:accompanying the gun from the Military unit which sent the gun
for repair.
The normal length of recoil,during,:firing with, a full charge should
be as follows: when thaangle elevation is from -2?30' to 4-20?,
between 1150 and 1320 mm. When the angle of elevation is from + 34? to
4 450, between 735 and 815 Mm,
The maximum length of recoil is 1350 mm.
? To avoid receiving an incorrect reading from recoil indicator 09-55
(fig 3), check its working order: To do this, try moving the recoil
indicator along recoil indicator guide 09-53.
The recoil indicator should be movable by hand and should be held in
a SPecified position by flat spring 09-56 (fig. 3').
PM. If the recoil indicator is not held in the specified position,
replace flat spring 09-56 with one made at DARN (appendix 1, sketch 217).
Rivet the spring to recoil indicator 09-55 with 2 rivets 4 x 16 GOST
1137-41.
50X1 -HUM
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Reasons for the malfunction:
In the Recoil Brake 50X1-HUM
R) /Insufficient quantity of oil.
PM. Screw out plug 09-116 and open cap Sb-09-31 (fig. 3) which is
located on forward cap 09-155 ct the cradle.
Give the tipping parts of the gun nn angle of elevation of 60, open
valve 08-48, and unscrew screw 08-72 from the recuperator rod and check
[text missing].
If oil does not appesr in the opening, then through the opening [p 52]
in the recuperator rod add iteol M by means of a funnel until oil appears
at the edge of the recuperator rod opening.
After checking, tighten the valve and screw down as far as possible.
Also close the cap -nd screw on the plug.
b) Wear of recoil-piston rod casing 08-16 (fig. 4).
Measure.the Outer diameter of the rod casing and comp-re it with the
average inner diameter- of recoil cylinder 08,11 as indicated in the gun
book.
?
The difference of the..dismeters should be no more than 0.4 mm
AkRM. If the difference ? of diameters.is .morethnn 0.4 ram, make a .
-casing (appendix?1,. sketch 210), place it on rod head 08-14 -rnd work the
casing around the recoil cylinder (sketch. 24). Move the three apertures
? for screws -08-59 300? .off-center-in relation to the old apertures inrod
head 08-14.
c) Wear of insert 08-34 (fig. Ii).
Measure the diameter of the insert aPerture and the outer dinmeter of
recuperator rod 08-28
The difference of the diameters should be no more than 0.5 mm.
-
ARM. If the difference of diameters is more thah 0.5 mm, replace the
insert-,(appendix 1, sketch 211). .
50X1-HUM
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In The Recuperator'
d) Insufficient pressure.
Check-initial-pressure in the recUperatOr with a manometer. With a
normal quantity of oil, the pressure should be .between 54 and 58 atm.
50X1 -HUM
PM. If the initial pressure is lower than prescribed, add air
(nitrogen) until the pressure reaches a normal level.,
e) InSuffiCient quantity of oiL*
Determine the quantity of oil in the recuperator with a gage. It
should be 20.6 22.6 lit'ers
PM. If the quantity of oil in the recuperator is below normal, fill
.the recuperator with steol M. until it reaches the normal level.
? Check it with a gage a:tecond tire,
,In the Mechanism for Changing the Length of ReCoil,
f The regulating device for changing the length of recoil is broken.
? Measure the distance between the marks on upper level 09-100A and
double-arm lever. 09105 The distance --should be l40 mm.
? 1. [Footnote - see paragraph b) above]
The average inner diameter can also be determined In the following
manner:
? Measure the interior of the cylinder with a star gage along 2 mutunlly
perpendicular diameters 3,300 pm in length (from the front end of the
cylinder)
[text missing]
50X1 -HUM
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a,- 16
? . ?
pi.,reLJ,m r....v7ncs,?;71c- nrwrkw
Iry Yr(lbf
Al rr,-,?7,7 Pe ;;?,50"C.
0314
re?
Set casing threads in POS-30 solder
It is permissible to heat the casing up to NO?C
,^9.?
? ?
c-??
-
, ? 7 p:_.?
, ? 4:i . ? 0.j I
1,
'
I?1
? R.; N=t11;
Ogliatrop -ezuMireti.0 03 1
. .
-1wrigrrtt f.tw'fim ntw il.f)04, 11(.1(39
Solder around with.
P0530solder
D-actual aversgo
Inner. diameter of
cylinder 08-1
.50,4-00,g
Prick punch
Three screws at equal -rpu e411,67X7 110 Patlfra)M
distances around ?f.v,lm/mw titt CANN au
Section along AA
vwfv_i r),, 4,1
cr, 9
(Xi ? )9
'3 tr?
the circumference. 36'ul'irjuil" Lk) 9"1
Tighten screws as much as
possible
".-3cloys 24, (603-1 ? urrog: 08-1?1 ro.aoliKa r()1;a: 08- 1 1, pvf5awi
MOq
Ourvm (yiApt; ty,
0
LIIroka: 0.8-5
-- -
?
Sketch 2)4. Sb0841. - rod; 08!-114 - rod head; 08-16 - rod casing; 08-59 - screw
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PN,.. If the distance is not 140 mm, loosen lock nuts 09-72 r- 941
and 09-137 and, turning adjusting nut 09-73, establish a distanc50X1 -HUM
-
140? mm Vietwesh the nark. After this, tighten the lock nuts, .
g) Insufficient traverse of throttling rod 8-28 (less than 33)
due to increased play of the mechanism for changing length of recoil.
(fig.3 and 4).
Set gun.in .combat position on level_groundT.
Determinate-the angle of traverse.of the 'throttling rod in the.
following.manner:
--give the barrel an angle of elevation of approximately 0? by turning
the elevating hand Wheel in proper direction;
--open cap Sb09-31 which is located on the forward Cradle cap;
--place pattern No 1. (appendix 11 sketch 385) on the front cylindrical
part of the throttling rod.- Fasten a plumb line to the lower, par-tof
the pattern;
...mark a graduation line through slots .in pattern No.l on forWard cradle
cap 09-155;?
--place pattern No 2 (appendix 11, sketch 392) in the slots on the front
end of the throttling' rod and shift the slide bar along pattern No 1 groove
up to the ztop:in pattern No 2 Take off pattern No 2 and mark the angIe
on the pattern No 1 scale;
--give the barrel an angle of elevation by turning the elevating hand-
wheel in same direction;
the slot-in pattern No 1 with the graduation line marked on
fOrwmtd cap 09-155;
.--place pattern No 2 in the slot of the throttling rod.and.shift the
? bar along pattern No 1 'groove up to the stop on pattern No 2;
--takeoff pattern No 2 and mark the angle on the pattern No 1 stale.
' The difference of the two angles indicates the actual angle of re
cuperator traverse.
. In determining the throttling rod angle of traverse, the m50X1--HUM
described above should be done three times. Find the arithmetic average
Of measurements taken and round off to the nearest degree.
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The throttling rod angle of traverse should be no less "o
50X1-HUM
Reaions for insufficient throttling rod angle of traverse.
1) Wear in the junction of upper rod 09-101 and lower rod 09-106 with
upper lever 09-100A, double-arm lever 09-105 and spherical pivot 09-102
(fig.3).
Check the size of axial vacillation of the rods in relation to the
levers. An axial vacillation of no more than 1.2 mm of each rod is
permissible.
PM. When there is vacillation of more than 1.2 mm, unscrew screws
A51063-40 and eliminate rod vacillation by tightening spherical pivots
09-102.
Allow for free movement of the rods. After adjusting, drill openings
4.5 mm in diameter and 13 4- 045 Mm ..in depth (measure depth from end of
protrudance on lever) in Spherical pivots along the threads in the 55]
aperatures of the levers... Plug ug the spherical pivots with screws
A51063-40 and center the screws..
If tightening, the spherical
file the inner end of the pivot
2) Wear in the junction of
with lever pin 09-111 ( fig.3).
pivots does not eliminate rod vacillation,
and then adjust as indicated above.
the opening in double-arm lever 09-105
Measure the diameter of the opening in the double-arm lever and the
outer diameter of the lever pin. The difference of the diameters should
be no more than 1 mm.
PM. When the difference of diameters is more than 1 mm, cut out the
oval shape in the lever opening, removing a minimum layer of metal. Replace
lever pin 09-111 (appendix 1, sketch 220). An increase in diameter of the
lever, opening up to 24 mm is permissible.
Atter setting the lever in the cradle, drill an opening with a diameter
of 22 1mm (measure the depth from lug 09-194) in the lever pin according
to the existing threaded opening in lug 09-194. Stop the lever pin with
screw A51064-3 and file off the screw.
? 3) Wear in junction of. opening in roller 09-107. and roller pin
09-108 (fig.. 3). ,
Measure the diameter of the roller opening and the oute50X1-HUM,
of the roller pin. The difference of diameters should be no more than
1 mm.
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PM. When the difference of _diameters. is more than 1. mm, replace
roller 09.a07 and roller-pin 09.a08 (aZendiX1., Sketches 218 atk50X1-HUM
Asiemble'double-arm lever 09105 or free turning
of the roller and atop the roller in with screw A 5106340 in a new posi-
tion (sketch 25). Weld.in'the old threaded aperture with electrode
E2.
4) year in junction of cam-guide 17-20 groove and roller 97-107
(fig .3 and 8).
Measure the width of the cam-guide groove and the outer diameter of
the roller. The difference should be no more than 1.5 mm.
PM. When the difference is more thdn 1.5 mm, clean the cam-guide
groove and replace roller 09-107 (appendix 1, sketch 218). '
.5) Wear of openings of bushings 09-11 and 09-114 in the jUnction
with variable recoil roller 09-140A (fig 3).
.Measure the diameters of the bushing openings and the diameters of
the rollers necks. The difference of diameters in each junction should
be no more than 1.5 mm.
When the difference of diameters is more than 1.5 mmo replace
the bushings (appendix 1, sketches 215 and 221).
6) Wear in junction of lever pin 09-112A with lever 09-40A (fig.3
and 4).
Measure the width of 'the lever groove and the diameter of lever pin
09-112A. The difference of measurements should be no more than 1.2 mm.
DARM. When the difference of measurements is more than 1.2 mmo weld
a layer of metal onto the side of lever 08-40A groove with electrode E50A
and work [text missing)
6. Contracted Recoil [1) 57]
(When the angle of elevation is from -2?30' to 4'20?, the length
of recoil is less than 1150 mm; from 4'34?t?.45?, the length of
recoil is less than 735 mm).
Length of recoil is determined during firing '?r is established by
records accompanying the gun from the military unit which sent the
gun for repair. 50X1-HUM
Reasons for the malfunction:
?
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451085-40
Crws5 sectw.q
Ce,ieHue no AA
punch
.M6.1 _-Pacta,0111111t,
?
-- 09-107
09-105
I3chit3 25. 09-105-- putaar allyri.letutii; 09,107 p (11
09-108 ? oct., po.-t;,; ,-151063-.10
. .
Sketch 25. 09-105 - double-arm lever;
09-1(8 - roller; 09-108 - roller pin;
SIN X '40 - screw
?
ti. ? 002
101
A NA -MG.YMIPVCI(111; duamemp wuna
.pnririen 00--s12A
difirileVey
lever' (Sin. 09-
? ViCi., Aterc4,1
BO no CITIPORHe
CpcOomarno 3 On0bU/40
ct..rs?l
Smcai \-2 3u:we eaVeS ()UMW peOpo ttoumiinumb
?Omcuduporsamp
3CNIf 3 26 118-10:?1-- pugar
Sketch 26. 08-40A - lever
ininH-1.xos
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In The Recoil Brake
50X1-HUM
a) ,Recoil-piston rod stuffing 08-6 is overly .tightened by stuffing
nut o8.,1 (fig 4).
? PM. With normal pressure in the recuperator rod, artificially recoil
barrel 450 -,500 mm with a hydraulic air pump. With a discharge of oil ?
from the sealed area of the recuperator operating cylinder, the barrel
should rpeOver stoothly, without jerking.
If the movement of thelwrel-is 'jerky, looSen the stuffing. After
clang this, makesure there Will be no oil leakage through stuffing.
'Check the tightness of the stuffing a.second time"by-the method indicated
above.
In the Recuperator
b) Excessive pressure
Cheek initial pressure in recuperator with a pressure gage-. With a
normal quantity of oil, pressure should be within the limits of 54 -
58 atm.
PM. If the imitialloressureAsmore than prescribed, disdharge
excess air (nitrogen) and bring the pressure down to normal.
c) Excessive oil.
? Determine the quantity of oil in the recuperator with a gage... It
Should be 20.6 - 22.6 liters..
PM. If there' is more oil in the recuperator than required, let out,
'excess Oil and cheek it with a gage a second time.,
? d) Stuffing 10-80 is overly tightened by nut 10-81 and stuffing
10-98 by piston rod nut 10-100.
PM. Check the tightness of the stuffing by the method indicated
above.
If barrel run out is jerky, decrease the tightness of stuffing 10-80
so that afterwards there is no oil leakage through the stuffing.
Check the tightness of the stuffing a second time.
50X1-HUM
If barrel run out is jerky, decrease the tightness of piston swirIng
.10-98 so that afterwards there is no oil leakAge through the stuffings.
After tightening, check nut 10-100 with stop 10-91. '
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In the Mechanism for Changing the Length of Recoil [1:, 58]
50X1-HUM
e) The mechanism for changing length of recoil is broken (fig. 3).
See chapter 5, item 5 e.
f) Insufficient traverse of throttling rod 08-28 (less than 330)
due to increased play in the mechanism for changing the length of recoil.
See chapter 5
item 5, g.
In the Junction of the Cradle and Barrel
g) Increased friction in the junction of the cradle end barrel
guides.
. inspect the open sections of the cradle guide operating surfaces.
Then move the barrel into traveling position and inspect the remaining
sections of the guide operating surfaces.
PM. When there are scratches, trim off any raised. metal.. If there
are brass protrudances, eliminate them by peraping-
7. Failure to Run Out or Run Out with Jerks
The nature of the run out is determined during firing or is esta-
blished by records accompanying the gun from the military unit which
sent the gun for repair.
Failure to run out or run out with jerks is not permissible.
In order to avoid failure to run out due to clogging of the air
exhausts in Plug grid 10122 (f14. 5) of the recuperator regulating bolt,
check the condition of the apertures.
In the Recoil Brake
a) Excessive oil (fig. 3 and 4).
PM. Screw out plug 09-116 and open cap Sb09-31 which is located in
forward cradle cap.
50X1-HUM
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Give the tipping parts_ of the,gunan,angleofelevation of:69and
open valve 0848. screw Out screw 08-72 from the throttling rod ar
50X1-HUM
let out 'excess oil. After this, screw in: the valve and. screw astar,a4
possible,/ A1t0,,:eldse the cap and ScreW-in the plug.
b) Air cushion in recoil cylinder. (Fig. 3 and 4)
M. Screw out plug 09-46 which is located in-the.forward cradle
Cap.
Give the tipping parts of the cannon an angle of elevation of 60
and open valve 08-48'
After letting out air, screw in the valve as far as possible and
close the opening in the forward cradle cap.
c) Recoil-piston rod stuffing 08-6 is excessively tightened by
stuffing nut 08-7 (fig. 4).
See chapter 5, problem 6a.
d) Nicks and scratches on rod casing 08-16 and throttling rod
casing 08-35 (fig. 4). 59]
Inspect the rod casing and buffer casing.
PM. Trim off raised metal. Moen there are deep scratches, send
the cannon to a higher repair shop.
DARN. Replace 'throttling rod casing 08-35 (appendix 1, sketch
212).
When assembling the throttling rod and casing, allow for free turn-
ing of the casing on the rod. To do this, screw on nut A51011-40 as far
as possible; then unscrew it 1/6 of a turn and insert cotter pin. In
case of non-alignment of the openings for the cotter pin, it is permiss-
ible to trim off the front end of the nut.
50X1-HUM
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?????????????,
2
Sketch 27. Clamp press. 1 - copper pad attached to head of screw;
2 - copper pad attached to jaw of hook; 3 - rod
MRM. Make a new casing 08-16 (appendix 1, sketch 270), place
on recoilpiston rod. head, 08-14, and. work casing around. bralpcylinder
(see sketch 24).
Move the three openings for screws 08-59 off-center 30? to 350 in
relation to old, openings in rod. head. 08-14.
e) Bend in recoil-piston rod. 08-12 and. rod. 08-28 (fig. 4).
Place the recoil-piston rod and. throttling rod. on a prizmatic
device and. check their degree of bend. by the indicator or by means of
a surface gage and clearance gage.
A bend of no more than 0.8 ram is permissible in the recoil piston
rod and throttling rod.
50X1 -HUM
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AARM. When the bend is more than 0:8 mm, straighten the piston rod.
and. throttling rod, [text missing]
50X1 -HUM
In the Recuperator Ei 60]
f) Insufficient pressure.
See chapter 5, item 5 d.
g) :Insufficient oil.
See chapter 5: item 5 e.
h) Stuffing 10-80 is excessively tightened by nut 10-81 and piston
rod stuffing 10-98 is excessively tightened by nut 10-100 (fig. 5).
See chapter 5: item 6 d.
i) Bend in rod. 10-32 (fig. 5).
Place the rod. on prisms and check the degree of bend. by the indicator
or by means of a surface gage and clearance gage.
A bend in the rod of no more than 1.4 ram is permissible.
AARM. When the bend is more than 1.4 mm, straighten the rod. in a
clamp press (see sketch 27) without heating.
In the Junction of the Cradle and Barrel
j) Increased friction in the junction of the cradle and barrel
guides.
See chapter 5: item 6 g.
Abrupt Run Out ..(11UnOtit,with a Knock)
The type of run out is determined during firing or is established
by records accompanying the gun from the military unit which sent- the'
gun for repair .
Run out should be smooth and. without knock.
50X1 -HUM
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Reasons for the malfunction:
In the Recoil Brake
a) Ipsufficient oil. See chapter 5, item 5 a.
b) Sticking of run out control valve 08-18 as a result.of which,
the valve does.not reach the slot of the moderator rod (fig. 4).
Screw out the moderator stem from inner tube 08-22, then screw off
nut 08720 and take out spring 08-19.
Try to move the valve along the moderator'stem. The valve should
move freely without sticking along the Stem.
PM. When the valve sticks, trim the, raised metal on the moderator
stem and in the valve opening but do not remove' all traces of scratches.
-c) Improper seating of moderator valve 08-18 in the slot of moder-
ator stem 08-17 (fig. 4).
50X1 -HUM
Check the seating of the valve in the slot of the moderator stem by
the paint marks. At least 70 per cent of the surfaces should contact
each other. [p 61]
PM. When less than 70% of the surfaces contact each other, grind
the valve in the slot of the moderator stem. To accomplish grinding,
place a layer of abrasive micro-powder M7-M14, thinned with kerosene,
on the valve. After grinding, check the fitting of the surfaces accord-
ing to the paint a second time.
d) Breakdown or fatigue in spring 08-19 (fig. 4).
The normal height of the spring in a free state is 45.54 2.3 mm.
DARM. When there is break or fatigue in the Spring, replace it
(chart 3).
e) Wear of throttling rod casing 08-35 (fig. .4).
Measure the outer diameter of the throttling rod casing and com-
pare it with the minimum diameter of the cavity for inner tube' 08_221
which is written in the gun service log.
1. The minimum diameter of the cavity, can also be determined in this
Planner: Measure the cavity of the inner tube with a star gage
along two mutually 'perpendicular diameters at a length of 1625 Init.
(from the front end of the tube), after each 100 ma [te:50X1-HUM]
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The difference of diameters should. be no more than 0.2 mm.
? /
DARK. When the difference of diameters is more than 0.2 nut,
replace ?throttling rod casing 08-35 (appendix- 1, sketch 212).
When assembling the rod and casing, allow for free turning of'the
casing on the rod: To'dotthis-,- adrew on nut A5101140 as far as
possible; then unscrew it one sixth of. a;turn and. insert a cotter pin.
In case of non-alignment of the openings for the Cotter pin, it is
permiseble to-trim off the:front-end of the mut. ,
50X1 -HUM
9
f) Rod 08-52 is damaged or has lost resiliency.
PM. Replace the faulty rod (appendix 1).
In the Recuperator
g) Excessive pressure.
See chapter 5, item 6 b.
h Excessive oil
See chapter 5, item ..6 c.
i) Breakdown or fatigue in valve spring 10-24 (fig. 5).
Normal height of spring in free state is 153+ 5 mm.
PM. When there is break or fatigue in the spring, replace it
(appendix 1).
j) Wear of valve 10-23 opening (fig. 5).
Measure the diameter of the valve openings and the outer diameter
of recoil piston rod 10-32. The difference of,diameters,should be no
more than 0.8 mm.
PM. When the difference of diameters is more than 0.8 mm, prepare
the valve for inserting a buShing' Make the bushing and force it into
the valve (sketch 28), [p 62]
50X1-HUM
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rbizontsw,a nocnwaviu
. Preparation dm"
for insertion
of bushing
" nicinotsoang eurvw
? it metro tirmonnanu aorpo
? .npu? epoitruse ? amarpenna A,
Norio
50X1 -HUM
a
gaaegilailWies . A -02struivecx kautaxbuniti
For the iemainder"w'v w"u 10i2
V3OCTAllbtrZ
A-actual largest diameter
twipbto peopo npumynumo of rod 10-
Smooth sharp edges 32
30.0
141-trgal 474-ry-ra
flAlisA 571-1
Material: brass LM t 57-3-1
Cela3.7 AC-anti:a:74, Smooth sharp edges
Sketch 28. 10-23 -- valve
9. Extended Roll Out of the Gun During Firing
Roll out of the gun is determined during firing with the tipping parts
of the gun at an angle of elevation of 0 to 5.. Tinen firing, the gun
should-be placed on a level concrete foundation (or hard ground) ItAxt
missing) (or in the ground), with the trails completely sepan50X1-HUM
the wheels braked by the hand brake. [P 63]
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. Roll out or the gun can also be established by records accompanying
the gun. from the military unit which sent the gun for repair.
A roll out of gun of no more than 300 mm is permisaable.
? / ?
Reasons for the ralfUnctiOn:
a) See chapter 5 item.8.,
In the Recoil Brake
b) Sticking of! moderator valve 08-18--the valve does not reach
the slot in moderator-stem 08-17 (fig. 4).
50X1-HUM
Screw the moderator stem out of inner tube 08-22. Then screw off
nut 08-20 and remove spring 08-19.
Try moving the Valve along the moderator stem. The valve should
move freely, without sticking, along the, stem.
PM. If the valve sticks, trim off the raised metal on the moderator
stem and the openingAn the moderator valve, but do not remove all
traces of scratchei.:
c) presence of hard-particles (chips,sand, etc.) in steol M.
, -
PM. Take the buffer apart and-WaehaIl parts. Before refilling
the buffer, with oil, carefully filter it or replace it:with new steol
Moil.
10. Rust on Outer and Inner Surfaces of Recoil PistonRod 08-12, on
Outer Surface of Recuperator Rod 10-32 and Rod 08-28, and on Inner.
Surface of Brake Cylinder 08-1, inner Tube 08-22, Recuperator Operating
Cylinder: 10-4, Stuffing Box 08-2, Forward Cap 08-23, and Stuffing Box
10-77 (fig.! 1. and 51
PM. Remove rust from the non-chrome surfaces of parts by wiping
the affected areas with a clean cloth or polishing by hand with a hemp
cord.
It is permissible to use fine charcoal powder mixed with steol M.
The small flaws which remain are permissible if they are cleaned to
a metallic shine.
50X
When there-is deep rust onthe-ton-thrOme surfaces Of Parts 1-HUM
, .,-....
the. gun to a higher.maintenance shop.* -
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When the chrome layer on the recoil rod, !throttling rod., recuperator .
operating Cylinder, and buffer is damaged (blistered), replace-the,buffer
and recuperator mechanismi (appendix 1). 50X1-HUM
.When there are no spare buffer and recuperator mechanisms, it [p 64]
is permissible to temporarily use those which have OsmAged chrome so long
as ther,.tis not oil leakage throUgh the sealing devices in the rods., buffers
and piston rods.
When spare buffers and recuperator mechanisms are received, the: old
ones (with chrome) should be replaced.
MRM. Remove deep rust on the inner surfaces of recoil cylinder
08-1, stuffing box 08-2, inner tube 08-22, forward cap 08-23, stuffing
box 10-75, and on outer surface's of the buffer, taking a minimum layer
of metal from all surfaces (chart 5).
Remove deep rust on the inner surface of rod 08-12 and intermediate
cylinder 10-9 by cleaning locally (chart 5).
11. Wear of Recuperator Piston Rod. Rings 10-97 and 10-99
(figure 5)
Measure the inner diameter ofthe recuperator operating cylinder
10.4 and the outer diameter of the rings. The difference of diameters
in each junction should. be no more than 1.5 mm.
DARM. When the difference of diameters is more than 1.5 mm, replace
the rings (appendix 1, sketches 226 and 227).
12. Damaged grid 10-122 of regulating bolt plug
(figure 5)
PM. Replace the damaged grid (appendix 1).
To replace the grid, the following steps are necessary:
--take out bushing 10-126 from plug 10-121 by boring the bushing.
The size of the bores in the plug should. be no more than 21+0.05 mm
in diameter and 8+0.4 imai in depth;
1. Do not permanently reject buffers and reCuperator mechanisms which
have damaged chrome layers on the surfaces of rods, operating,Cylinders,
and. buffers. Send them to stationary bases for electrochemical removal
of layer [text missing],
50X1-HUM
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--make bushing 10-126 (appendix 1, sketch 220);
--solder grid 10-122 to end of bushing 10-126 with solder POS-30;
--press bushing 10-126 into the bores of plug 10-121 and. center the
bushing at three points. 50X1-HUM
13. Dents and. Boles in Brake Cylinder 08-1
(figura 4) .
AARM. Remove bulges on the inner surface of the cylinder which are
caused. by dents on the outer surface (chart 6) .
AARM. If there are holes in the cylinder replace the bufferl
(appendix i). footnote/ missing]
14. Dents and. Holes in Air Cylinder 10-3, Intermediate Cylinder 10-9
and. Operating Cylinder 10-4
(figure 5)
DARM. Straighten the dents in the cylinder.
Small dents in the air cylinder are permissible so lolig as there are
no cracks.
[P65)
If straightening -dents in the operating .cylinder will cause damage
to the chrome layer on the inner surface of. the cylinder, replace the re-
cuperator. (appendix 1). -
Weld holes in the air and intermediate cylinders of up to 15 mm in
size. Weld plates onto holes of more than 15 ma but not more than 100 by
150 mm in the air cylinder and 80 by 120 mm in the intermediate cylinder
(chart 6).
If there are holes in the air cylinder of more than 100 by 150 mm,
holes in the intermediate cylinder of more than 80 by 120 mm, or if there
are holes in the operating cylinder, replace the recuperator (appendix 1).
50X1-HUM
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? Chapter Six
Elevating Mechanism and Equilibrator Maintenance 50X1-HUM
1. Air Leakage from the Equilibrator
(fig. 6)
'Cheek the hermetic seal of the equilibrator air system by doing the
following:
-r place a manometer in the upper socket of manifold 23-33;
-- place the tipping parts of the cannon at the maximum negative
angle of elevation;
-- with soapy water moisten the shank of nozzle 23-161 the manifold
head and lock nut 23-27, nuts 23-55, valves 10-571. and lock nuts 10-56;
the places where connecting ttbes'Sb23,21 and Sb23-22 connect with the
piston heads and with manifold 21...330 the connections of tube Sb23-16
with the manifold and cylinder; and brazed places on the equilibrator
air system tubing;
-- open valves 10-57 on the right and left pistons and check
whether there is air leakage through the donnections indicated above
and, by using the f,:atameter, whether or not the air pressure falls in
the equilibrator air systeM. There should not be a drop in pressure;
-- close valves 10-57 on the right and left pistons and check
whether there is air leakage from underneath the valves through the
connections of connecting tubes 8b23-21 wit.h the pistonhead and with
the manifold and through the connections of connecting tube Sb23-16
with the manifold and with the cylinder. Also, by using the manometer,
check whether or not there is a drop in pressure in the air system.
There should not be a drop in pressure.
Causes of malfunctions:
a) There is insufficient or no liquid in the equilibrator.
Place the tipping parts at an angle of elevation of from 30?
to 35?.
Open plugs 23-23 on the external cylinders and check whether liquid
comes out of the openings in plugs 23-23.
[text missing]
50X1-HUM
p 66]
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b) The cones of valves 10-57 fit loosely in their seats in the ip 67]
pistonheads (b in fig: 6).
PM. With leakage of air fromunderneath the valves (when the 50X1-HUM
valves are closed), smooth the cones.byzrindingor replace the valves
(appendix 1, sketch 224). .
DARM. With leakage of air, cut the bottom of the seats in the
pistonheads with ,a countersink or; ,a bore On 4 plane with the surface
which is being ground and smooth the cones of the valves by grinding
them.
If air leakage is not stopped after this, replace the valves
(appendix 1, sketch 224).
c) There is leakage of liquid from the equilibrator external
cylinders because the cones of plugs 23-23 fit loosely to their seats
in the external cylinders (7 on fig. 6).
Check whether or not liquid is leaking from underneath the plugs.
PM. If there is leakage of liquid, smooth the plug cones by
grinding or replace the plugs (appendix 1, sketch 260).
DARM. If there is leakage of liquid, cut the bottom of the seat
in the external cylinder with a countersink or a bore on a plane with
the surface which is being ground and smooth the plug. cones by grinding
them.
If leakage is not stopped after this, replace the plugs (appendix .
sketch 260).
d) The chrome layer is damaged (bulging) and rust is formed on' the
external surface of cylinder 23-3.
Raise the barrel to the maximum angle of elevation and examine the
external surface of the cylinders. .Bulging of the chrome layer or of
individual cylinder sections indicates that there is rust under the ,
chrome layer,
PM. If the chrome layer is damaged (bulging), replace the equili-
bratorl [Trans. note: footnote missing] (appendix 1).
If no spare equilibrator is available, the equilibrator with the
drl.miged chrome layer can be used temporarily if there is no leakage
from underneath the piston cylinaer.
50X1-HUM
When a spare equilibrator is received, replace the old equilibrator
(with the damaged chrome layer).
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?'"
e) ,There is leakage of liquid out Of the equilibrator external
cylinders because collars 23-74 are damaged (ruptures0.cracks).-
50X1-HUM
Give the barrel the maxim= angle of elevation. Then, by umu-eub-
ing the angle of elevation to the maximum negative angle of elevation,
Check whether or not there is leakage of liquid fram under piston
cylinders 23-3.
PM. Replace the collars if there is 'leakage of liquid andrio
damage to the chrome layer on the piston cylinders (appendix 1).:.
f) There is rust on the internal surface of external cylinder
23-146. ?
PM. Remove the rust by wiping the affected portions with a clean
rag. Afine charcoal powder mixed with steol ELcan be used. Send the
gun to a higher maintenance shop if the rust is deep.
AARM. Remove deep rust by removing a minimal layer of metal.
The internal diameter can be increased to 151 ma (chart 6).
Bore the opening of bushing 23-6 toga diameter of 127+1 ran if
the internal diameter of the external cylinder is 150.5 mm or larger.
g) The cone of nozzle 23-161 fits loosely in its seat in manifold
23-33 (8 in fig. 6).
PM. Smooth the cone of the nozzle by or replace the
nozzle (appendix 1, sketch 261) if there is air leakage.
ram. If there is air leakage, cut the bottom of the seat in the
manifold with a counter sink or a bore on a plane with the surface
which is being ground and smooth the nozzle cone by grinding it.
If the air leakage is not stopped after this, replace the nozzle
(appendix 1, sketch 261).
h) Leather rings 10-54 are not sufficiently tightened by nut
23-55.
PM. With air leakage from underneath nuts 23-55 and valves 10-57
(with the valves open), tighten the leather rings. If the air leakage
is not stopped, replace the leather rings (appendix 1).
i) Lock nuts 23-27, 23-37, and 23-159 of the connecting tubing
are not tightened sufficiently.
[p 68]
50X1-HUM,
PM. If there is air leakage through.the connections of La.= %.:01.ulecu-
ing tubing with the pistonheads, manifold 23-33, and the cylinder, tighten
the lock nuts so that there is no air leakage.
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j) There are cracks in tubes 23-176 and:23=177, and the brazing
at the connections of connecting,tUbes 23-176 'and 23-177 with clapping
sleeves 23-26 and of tubing 23-157 with nozzles 23736 and 23-158 is 50X1-HUM
damaged.
DARM. If there is air leakage at brazing locations, separate the
tubing from the nozzle or from the clapping sleeve,- then connect the
tubing again to the nozzle or clapping sleeve with POS30 braze and braze
the tubing with braze trait L62 grade brass or PMTS 54 GOST 1534-42 grade
copper-zinc braze.
If there are cracks in the tubing, cut out the damaged portion and.
connect both ends of the tubing with a' sleeve with P0530 braze
after ... [text missing]
After the tubing is repaired, test it for hermetic sealing with air [p 69)
pressure by;
-- connecting the tube Sb23-21 and the tube 5b23-16 and using a_
pressure of 140 atm..: for 5 mid:butes;
connecting the tube Sb23-22 and usinga pressure of 60 atm.. for
5?minutes.
WOCTARtglOP for the remainder!
,W61616A
(for sleeve) '
Length of removed tubi
Sleeve Artgra
Bana510 Tubing VCV
0,E62../1_PW ma
CITIKO
Tubing
TPOtio ?
WV
, - 1,5 *1---11 ? _ r.-- 15".
?
/ .
puncpme, npurwm 1.1,i izzinvfzi if:cp.:it/ 1762. azi ppunce:Ar
' ? ill4u-54. reCT;534-42Brazevith'grade.L62 brass: Or -PMTs'54
' -.
Sleeve material steel 2133{.7412-gmzgy. ura.7620 GOST 1534-42 braze
. sharp edges ? Oc.fic.:;.e- 1,150'rpz.:?rnilirr,,,. ,
Sketch 29. Tubing .Repair.
50X1-HUM
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2. Difficult Travel of: the Elevating Mechanism
Check the operation of the elevating mechanism by moiiin50X1-HUM
tippingroarts of the gun throh angles of elevation from ..2? 30' to
+46?, a1 then from +l.6? to -2 30'.
The mechanism should operate smoothly. The force necessary to
? start movement on the handle of the elevating wheel should be no more
than 8 kgl. [Timms. note:. footnote missing]
Causes of malfunctioning:
In the Equilil*ator
a) Air pressure in the equilibrator is too small or too great:
PM. If more force is needed on the elevating wheel handle of the
elevating mechanism to increase angles of elevation than to decrease
them, air should be added to the equilibrator.
If less force is needed on the elevating wheel ,handle to increase
angles of elevation than to decrease them, the air pressure in the
equilibrator should be decreased.
When the air pressure in the equilibrator is adjusted, there should
be about 44 atm. with a maximum negative angle of elevation and about
25 atm. with a maximum angle of elevation. These values are approximate.
The force needed to turn the elevating mechanism wheel is the basic
indicator of correct pressure adjustment in the equilibrator.
b) Springs 23-143 (fig. 6) are fatigued or broken.
If more force on the elevating mechanism wheel handle is necessary
to increase angles of elevation (at small angles of elevation) than to
decrease them after the pressure in the equilibrator has been adjusted,
the cause of this can be spring fatigue.
PM. Prepare two No. 2 washers (see sketch 16) and place one
washer between each spring and spring housing Sb23-20 (23-140). If
the force on the wheel handle (at small angles of elevation) for
increasing angles of elevation is still greater than for decreasing
them or if the springs have broken, replace them (appendix 1).
c) Bearings 1308 have failed (fig. 6).
PM. Replace the faulty bearing (appendix 1):
In the Worm Gear and Axle Brake
50X1 -HUM
[p 70]
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? d) The tension ofdisheddidk prings And the axle brake
(fig. 7) is not adjusted.
: 50X1-HUM
PM./ Adjust the tension of the diebed,disk7springs and the axle
brake as follows:
-- remove the cotter pin arid screw up nut 21-97 one to one and a
half turns;
-- remove catch 21-91;
-- While rotating the elevating mechanism wheel, simultaneouAl4T
unscrew cap 21-83 far enough so that the force on the handle is
noticeably increased. Then tighten cap? 21-83 one twelfth turn And
check the Wheel rotation;
put catch 21-97 in place;
-- unscrew nut 21-97 far enough eo that worm fitting 21-22 is
'stopped. Then it is no longer possible to rotate the wheel;
-- screw up nut .21.97 one sixth -turn and again check the wheel
rotation. Then fasten the nut with a cotter pin.
e) The meshing of the teeth of worm wheel SO21-4 with the thread-
ing of worm fitting 21-22 is jammed (fig. 7).
PM. Take off catch 21-91 which bolds cap 21-83 and free bearings
8211 by turning the cap.
(text missing]
doing this see that the end of the catch goes into the groove
of the adjusting insert when setting catch 21-91. After the adjustment
is completed, paint the adjusting insert groave?which.is located
opposite the catch,with red lead and position thecatch. Then adjust
the tightness of dished-disk springs 21-30 and the axle brake as in-
structed above in problem 2, "d".
f) Bearings 54810 and, 8211 7) have failed..
PM. Replace the faulty bearings (appendix 1).
In the Bevel Gear
?
g) There is jamming in the gear meshing of pinions 21-40:ar-'
21-.100 (fig. 7). 50X1-HUM
PM. Disconnect ball-and-socket joint socket 21-61 from shaft 21-38.
[1:, 71]
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Test the Wheel rotation. If rotation is'difficult, adjust the
gear meshing by placing additional spacing rings 21-62 and 21.6s
(appendix 1, Sketches 252 and 253) under the flanges of Spli150X1-HUM
21-32 and,cap 21-44.
h) Bearings 204 and 206 (rig. 7) have failed.
PM. Replace the faulty bearings (appendix 1).
In the Crankshaft Mechanism
i) Bearings 7216 (fig. 7): are tightened excessively.
PM. Loosen the tight adjustment of the bearings by placing an
additional Spacing ring 21-6 (appendix 10 sketch 250) under the flanges
of hub 21-7.
There should be no axial movement inside adjuster bushing 21-2
after -adjustment of crankshaft 21-1. -
j) Bearings 7216 and 218 (fig. 7) have failed.
PM. Replace the faulty bearings (appendix 1).
In the Round Gear
k)' There is jamming in the gear meshing of pinions 21-70 and ?
232-160 -(fig. 7).
PM. Check the meshing of the gears after adjusting the meshing
of pinions 21-40 and 21-100 (see above item 2, "g") and with the crank-
shaft removed.
Test the wheel rotation. If rotation is difficult, adjust the
gear meshing by placing an additional spacer 21-88 (appendix 10
sketch 254) under housing 21-67.
1) Bearing4204 (fig. 7) have failed.
PM. Replace the faulty bearings (appendix:1).
In the Junction of the Cradle and the Crankshaft
110 There are-dents, Seizing, and kneading in gear segments 0950
and in the toothed gears of crankshaft 21-1 [text missing]
50X1 -HUM
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:In the, Ball-and-Socket joint ? (11 72)
n) There is catching of bail 21-58 -ofthatall-and-sOcket joir50X1-HUM
and of r3mg'21-59-in socket 21-61: of.the ball-and-socket. .joint (fig. 7).
- PM.' Remove the ball-and-socket joint and dismantle, it. Remove
rust fram ball-and-socket joint parts and clean the parts where they
are jammed. -
In the Cradle ,
o) Roller bearings 2218 (fig., 3). have, failed.
PM. Replace the faulty roller bearings (appendix 1).
3. Increased Gross Vertical Play of Gun Tipping Parts
In the firing position, place the gun'. in .a.perfectly level position
and. 'manuallyapply the gun wheel brakes..
By operating the gun elevating and traverse mechaniams, position
the barrel horizontally apprOxiMatelY in the middle position between
the trails.
Push upward on the muzzle end of the barrel with a force of about.
125 kg and, while holding the barrel in this position, measure the
angle of barrel elevation with a quadrant on the check seat of the
barrel. Then apply the same forCedownward on the muzzle and, while
holding the barrel in this position, measure the angle of barrel eleva-
tion again.
The difference between the angle. measurements indicates the.amount
of gross vertical play in thousandths.
Measure the gross vertical play as indicated above three times.
Take an arithtetical average of the measured results and round. off
the average to the nearest thousandth.
The gross vertical play should be no more than 12 thousandths.
Causes of malfunctioning:
.a) There is axial movement Of worm fitting 21-22 due to break-
down or fatigue of dished-disk springs 21-30 (fig. 7)'.
Remove cap 2169.'
50X1 -HUM
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1-led u! PeWsseloaCI
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? 0- ? Jacket fitting:
:!Thickness of worm teeth
0 17,7,../1.7,e7,1 oven 3.P717-.1,,,,
normal cross-section at ?
,! height of 3.3 mm from Zkt:Lwav ?
2, -4 0 PATIAI CVCC170 ?
apex of teeth ? .A.N.:ncric.r.,=4.,;.:0 ?
4-actua1 maximuM thickness of teeth of worm-
I
1 rms.
-1-5-A,--; --.1--r
wheel Sb21 -4 in normal cross-section at a , ;.',.-? !(.?-?-:?:11......,
.--Z\ \i
? File ends of threading
*to thickness of 2 mm.
gvitpl N,
um;22,-
p,:??=-4
jacket
'height of 5.6 mm from apex
of
k. -.7
0 f ,'.....? ..:? ? .-vc:.. . .3 ::
.:1
. .1
..!.. 17...; cl.-
4 1-::..) *-.7.,:.:7,-..?
. i tr-7-1 47.:J.
? 1 i:
I I
111:..'-, :. ..-.......i
-
61.1 L?.3
Jacket
.???????????
.JOr the remainder .
`72:Tzn,z7:
Im6cith sharp edges
Caveugolav
Oxidize
Et1 ',rare-VIP 7kIV.2ni
Preparation for jacket placement
rr__. wpm
mametemorommaWAMPS24
? Le
1 710-
11 Smooth sharp edges
" Material: KT75-0KhN1K steel Cer;y: p;?.7) ct,-7,,rsra
c?,,;;177mooth sharp edges
Sketch 30. 21-22 -- Worm Fitting
ininH-1.X09
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Turn the elevating mechanism wheel, 'first in one direction, then
in the other. Check whether or not there is axial movement of the
worm fitting. .50X1-HUM
i, there is axial movement, remove the worm fitting and the
parts assembled with it and eXamine the dished-disk springs.
If the Springs are broken., replace them (appendix 1.).
If the springs are not broken, the following is necessary
remove retainer 21-33;
(text missing]
-- put retainer 21-33 in place and position the worm fitting with
its parts and the axle brake on the cannon;
? -- adjust the tension of'dished-disk springs 21-30 and the axle
brake (see chapter VI, item 2:"g") and check again whether or not there
is axial movement of the worm fitting.
If there is axial movement, make a spacing ring from grade 4o
steel (spacing ring dimensions: external diameter of 103 imv
thickness of 2 to 3 mm, and diameter of the opening of 46;10.7 mm) and
place it between stop washer 21-29 and the dished-disk springs. Then
adjust the tension of the dished-disk springs in such a way that the
height of the springs is equal to 48 mm.
If the axial movement is not stopped by inserting the spacing
ring, replace the springs (appendix 1).
b) The junction of cradle toothed segment 09-50 with the gear
teeth of crankshaft 21-1 is worn (figs. 3 and 7).
Measure the clearance between the segment teeth and the crankshaft
gear at several angles of elevation by the following:
insert a 2 by 10 mm lead plate with :a length of 120 =between
the segment teeth and the gears (along the line of the teeth). ?
-- flatten the plate by turning the elevating mechanism wheel and
then take it out;'?
fp 73]
7.- measure the smallest thickness of the plate from both ends.
The thickness of the plate indicates the amount of clearance between .
the teeth. ?50X1 -HUM'
?
The clearance between the teeth should be less than 1.6 ma.
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..,.. DARK. If the clearance is more than 1.6 mm, shift the cradle
segment (chart 7).
c) ,The junction of the teeth of worm wheel Sh21-4with *l HUM
threading of worm fitting 21-.22 is worn (fig. T) ?
Measure the thickness of the worm wheel teeth at a distance of
5.6 mm from the apex of the teeth and the thickness of the Worth fitting
threading at a:distance:Of 5.5 itim from the apex of the threading.?
The thickness of the worm wheel teeth should be no less than 6,9
mm. The difference between the threading pitch of 17.28 mm and the
sup of the worm wheel teeth thiCknesa and the Worm fitting threading
thickness should be no more than 1.7 mm.
DARK... If the thickness of the worm wheel teeth is less than
6.9 mm, replace the worm wheel and the worm fitting (appendix 1).
AARK. If the difference between the threading pitch and the
total teeth and threading thickness is greater than 1.7 mm, place a
jacket on the fitting-andmachine it (sketch 30).
While pressing the jacket on the fitting, heat the .jacket to
400? to 11.500 C. ?
d) The bearing Surface of upper carriage pivot 17-62 is Worn
(9 in fig. 8).
[text missing)
... with the gun mechanism put the tipping parts of the gun at,
the maximum negative angle of elevation.
? Push downward on the muzzle with a force of approximately 125 kg
and, holding the barrel in this position, measure the clearance between
the bearing surfaces of the upper and lower carriages from the breech
mechanism.
The clearance should be less than 4 mm.
. DARK. If the clearance is greater than 4 mm, build up -a layer of.
Metal on the bearing surface Of the pivot crimp with an E50A electrode
and machine it (sketch 31).
50X1-HUM
[P. 75
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A-
diameter of
upper
oarraige
.44POTIL-rifidi
cluawmp
" cc:117.h=
Maitire ? ?
Machine flush
04060mamb JC,70611140
Protect openings
frOm loose metal
Gr?:,:ef.;":1:7tiD
riu mit cm
meiradV0
f'45 ?
Smooth sharp edges.
; .
, :
?
(.51
Oxidize
Sketch 31. 17-62'-- Pivot
Lk. Increased Play of the Elevating,Methanism ?
(More than 5/8 of a Turn of the Wheel).
(fig.. 7)
Place the gun in the firing position.
50X1 -HUM
Fasten a,wire indicator (tfointer) on housing 21-37 of the bevel
gears in suai a way that its end' is located at the elevating mechanism
wheel rim.
Place the barrel approximately in an horizontal positiori by moving.
the gun elevating mechanism. Find where the play of the elevating
mechanism stops by turning the wheel [text missing]
Place a quadrant on the barrel check seat 'along the longitudinal
line and Set the quadrant bubble in the middle.
[P76]
Slowly turn the wheel the other way. Stop it the moment the
bubble moves from the quadrant level position and again make a line50X1-HUM
to indicate the second position of the wheel.
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The angular displacement of the marks on the wheel rim..indicates
the amount Of mechanism play.
50X1-HUM
Car'y out siri41ar cheeks with angles Of elevation of 12?, 36w, and
150 and with that angle at which the gun is locked in the travelling
position, .
The play of, the mechanism should not exceed 5/8 of a turn of the
wheel.
Causes of malfunctioning:
a) See chapter.6, item 30 "a", gib", and "c".
Lithe Bevel Gear
b) The meshing of pinions 21-40 and 21-100 is not adjusted.
PM. Disconnect socket 21-61 of the ball-and-socket joint from
shaft 21-38. Adjust the toothed meshing by decreasing the thickness
of spacing rings 21-62 and 21-65 or by replacing the spacing rings
with thinnei. ones (appendix 1, sketches 252 and 253). Then, wheel
rotation should be easy without catching.
c) The teeth of pinions 21-40 and 21-100 are worn.
Measure the thickness of the teeth of pinion 21-40 at a distance
of 1.87 mm from the teeth apex and the thickness of the teeth of
pinion 21-100 at a distance of 2.61 mm from the teeth apex* The
thickness of the teeth is MeasUred on -a large auxiliary Cone.
The thickness of the teeth of pinion 2140 should be no less than
2.4 mm and of pinion 21-100 nO less than 3 mm.
DARM. If the thickness of the teeth .is less than the indicated .
value, replace the gears (appendix 1).
In the Ball-and-Socket Joint
d) The junction of ball-and-socket joint pin 21-60 with the
openings of ball-and-socket joint ring 21-59 is worn.
Measure the diameters of the ball-and-socket joint ring openings
and the diameters of the terminal parts of the pin. The difference in
the diameters of each junction should be no more than 0.7 7=6
50X1-HUM
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DARM. If.the.difference is greater than0.7,mat.6 make the ring
opening round by removing a minim layer of metal, ,replace the ball-
and-socket joint pin, and machine the opening'in'ball-and-socket 50X1 -HUM
ball 21-58 to conform to the true diameter of the ball-and-socket joIn-u
pin (chalt 8).]
The diameter of the ring openings can be increased up to 12 mm.
If the diameter of the Opening is greater than 12 nut, replace the
ball-and-socket joint ring, ... (text missing ?
Measure the width of the socket groove and the thickenss of the
bar-and-socket joint ring. The difference of the measurements should
be less than 0.7 mm.
DARM. If the difference is greater than 0.7 maul take out the
irregularity in the walls of the socket groove by removing a minimal
layer of metal and replace the ball-and-socket joint ring (chart 8).
The width of the groove can be increased up to 20 mm.
In the Round Gear
f) The meshing of pinions 21-70 and 21-160 is not adjusted.
PM. Make this adjustment after adjudting the meshing of pinions
21-40 and 21-100 (see above item 4, mb") and with the crankshaft
removed.
Adjust the teeth meshing by decreading the:thickness of spacer
21-88 or by replacing the spacer with a:thinnerone (appendix 1,
sketch 254).
Wheel rotation ihould then be easy without catching.
g) The teeth of pinions 21-70 and 21-160 are worn.
Measure the thickness of the gear teeth at a distance of 2.24 rara
from the teeth apex. The thickness of the teeth should be no less
than 2.7 moo.
DARM. If the thickness of'the teeth is legs than 2.7 non, replace
the gears (appendix 1).
50X1 -HUM
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5.:A3rokenJ:Gear'Teeth'of Crankshaft 214. and Broken Teeth of
Arc 09--50
(fids. 3 and 7) .
50X1 -HUM
? DARM If 4 crankshaft gear tooth or an arc tooth is broken for
any length and to a height of less than 5 mm from the apex or if one
of them is broken at any height and for a length of 25 mm, restore
the tooth by welding (chart 9).
If the crankshaft gear teeth are broken or if one arc tooth is
broken for more than; 25 rom in length and more than 5 mm from the apex.
in height, insert dowels, weld them, and Machine them '(chart 9).
If two or three teeth of the arc are broken, idbed an insert
(chart j).
? 6. Holes and Dents in External Cylinder 23-3:46 and in
Cylinder 2573 of the Equilibrator
?(fig. 6).
PM. Dents in external cylinder 23-146 are permissible if they
do not hinder normal piston operation or interfere with dismantling:
and assembling the equilibrator.
If dents in the external cylinder hinder piston 'operation or
dismantling and assembling and if there are holes in the external
cylinder or dents and holes in the piston cylinder, replace the
equilibrator (appendix 1).
(text missing]
Weld holes (Footnote: An external cylinder with a hole may be
repaired only ... (text missing]) in the external cylinder up to 15 mm
in size; larger than 15 mm, but smaller than 90 by 135 um, seal with
inserts if the holes are located on part of the hydraulic lock (from
the lower face of the cylinder to the internal rib); seal with cover
plates (chart 6) if the holes, measuring smaller than 90 by 135 nm, are
located on other areas of the cylinder.
If the dimensions of a hole in the external cylinder are greater
than 90 by 135 rem, replace the equilibrator (appendix 1).
50X1 -HUM
[P78;
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Weakening of Rivets 21-21 which Connect Tread 21-19
to Nave 21-20 of the Worm Wheel
Check whether or not the rivets: have weakened.. Carry out the
check by tapping the rivet heads with a .check hammer. Put a finger
on the opposite end .of the rivet while tapping; if the rivet has
weakened, a movement will be felt.
PM.? Remove the weakened. rivets. 'Measure the diameters of the
openings for the rivets in the tread and in the 'nave, and determine
how oval the openinge are..: If are, 0;5 mm out of round,.
drill and ream the openings. The opening diameters can be increased.
up to 15 um.
50X1 -HUM
Replace weakened rivets with new rivets' 21-21 (appendix 1, sketch
251). If fewer than, eight rivets have., weakened, replace .only the
weakened 'rivets.
If eight or more rivets have weakened., replace all of the rivets.
Replace the rivets alternately in the order of their diametrical posi-
tion without separating the tread from the nave.
50X1 -HUM
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. Chapter Seven. [ID 79]
50X1-HUM
/
Maintenance of. Traversing Mechanism and Upper Carriage
1. Stiff Operation of Traversing Mechanism
Place the gun on level surface in combat position.
- Check the. operation of the traversing mechanism giving the rotating
parts of. thegun various ?angles of laying. ?
, The mechanism should operate- smoOthly. :The force on the handle of?
the handwheel required to operate the-mechanism should be no greater than
6 kg.1 [Footnote missing]
Causes of Malfunctions:
In the Junction of the'Upper Carriage and Lower Carriage
a) The upper carriage is not suspended in relation, to the lower
carriage (fig 8)..
Elevate the tipping parts of the gun to 460 and with a clearance
gauge measure the clearance between the bearing surfaces of the upper and
lower carriages from the side.of the breech parts; lever the tipping parts
of' the gun to a negative angle of elevation of -2030 and measure 'the
clearance between the bearing surfaces from the side of the chase.
There should be no contact between the surfaces.
. The clearance between the bearing 'surfaces should be no less than
0.05 mm (a clearance gauge of 0.05 mm' should Pass freely) And no greater
than 0.5 mm.
PM; If the clearance is less than 0.05 mm, remove Locking gibs 17-72
and 17,67 and screw up regulating bolt 17.43 of the pivot (if the clearance
is less than 0.05 mm from the side of the breech parts) or lock nuts 17-53
of the rollers (if the Clearance is less than 0.05 mm from the side of the
Chase) so that a clearance gauge of 0.05 mm ?asses freely between the
bearing surfaces.
If screwing up the regulating bolt or lock nuts does not increase the
clearance (the clearance is less than 0.05 mm), it is necessary to
screw off pivot cover 17-42 and 'lock -nuts 1753 and remove and inspect 1 p 801
dished-disk springs 17-36 and 17-24 and bearings 8211 of the nivrit
and 205 of the rollers. 50X1-HUM
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.If the springs and bearings are broken, replace them (appendiv
50X1 -HUM
If -91e springs and bearings are not brOken, the reason why the
clearances cannot be increased is fatigue of the dished-disk springs.
In this case, replace the dished-disk springs (appendix 1).
After replacing the faulty springs and bearings, and also when the
clearances between the bearing surfaces are greater than 0.5 mm ,-suspendt
the upper carriage in relation .tothe lower by regulating bolt 17-43 and
lock nuts 17-53 to that the clearances between the bearing surfaces are:
within the limits specified above.
After making the adjustments, secure the regulating 'bolt and lock
nuts with locking gibs 17-67 and 17-72.
In the Bevel Gear
b) Jamming in the meshing of gears. 22.34 (fig 9).
PM. Remove screw A51063.8-which fastens.guide'sleeve 22-65 on shaft:
22-31 and disconnect the guide sleeve from cross. piece 22-66.
Test the rotation of the hand wheel. rotation is stiff, adjust
the meshing by placing an additional spacer 21-62 (appendix 1, sketch
252)under the flange of bushing 21-32.
After making the adjustment, connect 'the guide sleeve with the cross
piece and check the force on the traversing handwheel.
c). Broken bearings 204 and 206 (fig. 9).
PM. Replace faulty bearings' (appendix 1).
In the Junction of the Arc of the Lower Carriage and the Gear "haft....
d) Nicks, scratches and burrs on the teeth of axe 18-47 and on the
gear teeth of shaft 22-1 (figs. 9 and 10).
PM. Clean the surface of the teeth, removing only the raised metal.
In the Worm Gear
The detection and elimination of malfunCtions in the Worm
take place after- the elimination of causes of malfunCtions
d.
e) Excessively tight bearings 7606 and 7207 (fig. 9).
gear should
b, c, and
50X1 -HUM
?
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? PM. Try the rotation of the handwheel. If the rotation is stiff,
loosen the bearing adjustment by Placing additional spacers 50X1-HUM
missing)/
After adjustment, worm 22,4 and: gear shaft 22-1 should not have [p 811
axial movement.
f) Jamming in the meshing 'of the teeth of worm wheel 22-3 with the
threads of worm 22-4 (fig 9).
DARM. Try the rotation of the handwheel.. If the rotation is stiff,
adjust the wont meshing by changing the thickness of spacers 22-6 by.
inserting additional spacers 22-6 .(appendix 10 sketch 256) or by de-,H
creasing the number of spacers..
g) Broken bearings 72070 76060 and 210 (fig 9).
PM. Replace the, faulty bearings (appendix 1).
In the Joint
h) Jamming Of ball 21-58 and ring 21-59 of the joint in socket
21-61 .(fig 9).
PM. Remove the joint and take it apart. Remove rust from the parts
and trim the parts in the places of jamming.
2. Increased Gross Horizontal Unsteadiness of Rotating, Parts
Place the gun in combat position on a level surface and apply
the 1:whee1 brakes.
By operating the elevating and traversing mechanism, set the barrel
in a horizontal position approximately midway between the trails.
Push the muzzle to the left with a force of approximately 50 kg and,
keeping the barrel in this position and rotating the micrometer head
and reflecting mirror, sight the crosshairs of the panoramic sight (the
top of the center A of the sight) on any aiming point and note the
reading of the azimuth scale. Then push the muzzle to the right with
the tame force and, keeping the barrel in this position and rotating'
the _micrometer head, again sight the crosshairs (the top of the center
.A Of the sight) on the same aiming point and note the reading of the
azimuth scale.
50X1-HUM
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The difference between thereadings of the 'Azimuth scale will
the amount of gross horizontal play in thousandths. * 50X1-HUM
Mesinre the gross horizontal play three:bites AS WiCAtAa above
and take the arithmetic average of the measurements rounded off to the
nearest thousandth.
The gross horizontal play should not be greater than 12 thousandths.
Causes of malfunctions:
a) Axial.movement of worm 22 4.-
Rotate the traversing handwheel in one direction, and then, changing
the direction of rotation, check [text missing)
PM. In'the case of axial movement, decrease the thickness of _ [p 82)
spacer 22-19 or replace it with a.thinner spacer (appendix 10? sketch .
257). The rotation of the handWheel should be light, without catching.
b) Wear in the meshing of the teeth of arc 18-47 with the teeth .
of gear dhaft 224 (figs. 9 and 10).
Measure the thickness, of the teeth. of the arc 3.5 mm from the top
of the teeth and the thickness of the gear teeth 7.65 mm from the top ?
of the teeth.
The thickness of the teeth of the arc Should be no less than 8 mm,
and the thickness of the gear teeth, no less than 10..6 mm.
AARM. If the thickness of the teeth. of the arc and gear are less'
than the specified dimensions, shift are 18-47 (chart 10).
c) year in the meshing Of the teeth of worm wheal 22-3 with the
threads of worm 22-4 (fig 9).
Measure the thickness of the teeth of the worm wheel 4.09 mm from
the top of the teeth and the thickness of the threads of the worm 4 mm
from the top of the threads..
The thickness of a tooth Of the worm wheel should be no less than
4.8 mm. The difference between the pitch of the threads (12.56 mm)
and the sum Of the thickness Of a tooth of the worm wheel and the
thickness of a thread of the worm wheel should be no greater than 1.7 mm.
50X1-HUM
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?machine flush
C4.-z7:Lw,crinetto
true width of castle-type
projection of gear shaft 22-1
Blunt sharp edges. Distortion of more than
0.15 mm not pernissable. Oxidize.
cri
CD
Sketx 32. 224 - upper clutch plate; ?
22-9 - intermediate clutch plate
-
..-pachine flu
-440rniimq/63emmiew(0
Blunt sharp
0.15 mm not
Sketch 33.
A -true diameter of grooves of
worm wheel 22-3
edges. Distortion of more than
pernissable.
22-10 - clutch plate
ininH-1.X09
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. DOM. If the thickness of a tooth of the worm wheel is less than
4.8 mm, replace the worm wheel and worm (appendix 1). "
50X1 -HUM
AARI4 If the difference between the pitch of the threads and the
sum of the thickness of a tooth and the thickness of a thread is greater
than 1.7 mm, replace the worm,with one having thicker threads. (appendix
1, sketch 255).
d) Wear in the junction of the castle-type projections of gear shaft
22-1 with the rgrooves of the upper (22-8) and intermediate (22-9) clutch
plates (fig 9)i
? Measure the width of the grooves of the clutch plates and the thickness
of the castle-typeprojections_of the gear shaft. The difference between
the dimensions in each junction should be no greater than 1.2 mm.
DARM. If the difference is greater than 1.2 mm, remove the burrs on
the castle-type projections, build up the sides of the grooves of the
clutch plates with a layer of metal, using an ENX11-30 electrode, and
machine grooves for the projections of. the, shaft (sketch 32).
e) Wear in the Junction of the projections of ?clutch plates 22-10
with the grooves of worm wheel 22-3 (fig 9).
? Measure the width of the grooves of the worm wheel and the .width of
the projections of the clutch plates,. The difference between the dimen-
sions in each junction should be no-greater than 1.2mm.
AARM. If the difference is greater-than I:21vm, remove burrs in
the grooves of the Worm wheel by taking off a minimum, layer of metal,
[text miasingl ?
The width of the grooves may be increased up to 12 mm. If the [p 84]
width is greater than 12 mm, build up the grooves- by gas welding using
LAZhMts 66-6-3-2 brass and machine new grooves (sketch 34).
f) Wear in the junction of pivot 17-62 and the aperture of the
upper carriage (fig 8),.
Measure the diameter of the aperture of the upper carriage and the
external diameter of the upper pivot journal. The difference between
the diameters should be no greater than 1.4 mm.
DARM. If the difference is greater than 1.4 mm, build up the upper
pivot journal with a layer of metal, using an E5.0A electrode and
machine (see sketch 31). 50X1 -HUM
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alpaciatvme
ilanorkutio
50X1 -HUM
' -
machine :flush'
? ? Domp:le: r6;217,cyr3L.rum)
Blunt sharp edges
Sketch 34. 22- - worm wheel
?
3. Increased Play in the Traversing Mechanism
(greater than 7/8 of a turn of the handwheel)
Place the gun in combat positiOn.
Fasten a wire indicator (pointer) on housing 21-37 (fig 7) so that
the end is located near the rim of the traversing handwheel.
Insert extension Sb41-37 (fi& 18) in the panoramic sight socket and
tighten it; then insert the panoramic sight in the socketof 41?
50X1 -HUM
and tighten it.
Operating the elevating and traversing mechanisms of the gun, [text
missing]
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Turn the traversing handwheel in either direction until it tak rAcl
hold and sight the crosshairs of the panoramic sight. (the top of t50X1 -HUM
center .4% of the sight) on an aiming point.
Note the position of the hand wheel with a mark on the outer surface
of the rim at the indicator.
Slowly turn the handwheel in the opposite direction until the moment
the,crosshairs (the top of the center7,c).of the sight shift from the .
aiming point and note the second position of the handwheel with a mark
at the indicator. The Ingular displaqement of the mark on the rim of the
handwheel will give the amount of play in the mechanism.
Conduct the same check for angles of horizontal laying 300 thousandths
left and right of the center position of the barreL.
The play of the mechanism should be no greater than 7/8 of a turn
of the bandWheel.
Causes of malfunctions:
See Chapter 7 item 2
a,, b, a,
In the Junction of the Guide Sleeve and Connecting piece.
b) Wear in the junction of theHprojections of guide sleeve 2265
with the grooves of connecting piece 227.6 (fig 9).
Measure the Width of the grooves of the connecting piece and the
thickness of the projections of the guide sleeve. The difference between
the dimensions in each junction should be no greater than 0.5 mm.
50X1 -HUM
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actual width otzroove
in connecting piece 22.066
001;rfitSerliag tuirptITT
NO
fiaiii 0 Kpeemalutie 22-E5
v.:1 ? .V45'
-7-
: ,
-
? t\-.1
06.PciMPtilil? ,15
vy,cLitiugo .
.-taachihe',- ? +04
flush - ? ..
f-Eu
C57 'C:?1,1 ?
? CI;71:j7:.iii D
:
/5!U5Ti
machine flush
50X1 -HUM
The deviation of the axis Of Irwojection A in relAtion to
_ ,
the a xl s Of aperture: D should be no greater than 0.1 mm.
_Blunt sharp edges.
Oxidize:
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DARN. If the difference is greater than 0.5 mm, reitove the burrs in -
the grooves of the connecting piece by taking off a minimum layer 50X1-HUM
metal [tipxt missing] .
The width .of the grooves of the connecting piece miy be increased
'up to 12 mm. If the width is, greater than 12 mm, replace the con-
necting piece (appendix 1, sketch 259).
In the Bevel Gear
c) Meshing of gear 22-34 is out of'adjustment (fig 9).?
?
PM. Remove screw A51063,- 8 WhiChfaStens?guide sleeve 22-65 on -
.shaft 22-31 and disconnect the-guide sleeve from connecting piece 22-66.
Next, disconnect socket 21-61 of the joint from shaft 22-48 and adjust
? the meshing by decreasing the thickness of spacer 21-62 or by replaCing
the spacer with a thinner one (appendix 1i-sketch252). The rotation of
? the handwheel should be light, without Catching. After making the
adjustment, connect the socket of the joint with the shaft and the guide
sleeve with the 'connecting piece.
? d) Wear of the teeth of geat'22-34(fig
Measure the thickness of the teeth 2.24. 'malaYfrom the top on, a large
auxiliary cone. .
The thickness of the teeth should be no less.than 2.6 mm.
DARM. If the thickness of the teeth is less than 2.6 mm, replace
the gear (appendix 1).
In the Joint
e) Wear in the junction of pin 21-60 with the holes in ring 21-59
.of the joint.
See Chapter. item 1,'d.
4. Increased Disturbance of Horizontal Laying During Firing
Resulting From Slippage in the Clutch of the
Traversing Mechanism
This is determined during firing or established from the records
accompanying the gun from the military unit which sent the cannon in. for
repair.
50X1-HUM
Disturbance of horizontal laying resulting from clutch slippage
during the firing of a round is allowed for up to two revolutions of
the handwhee1.1 [Trans. note: Footnote:missing]
61,
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Cause of:malfunction:: friction disks 22-8, 22-9 and 22-10 are
inadequately tightenedl)y hut 22-13 (fig 50X1-HUM
?
PM. /Check the position of the horizontal line on the face of nut
22-13, which should follow the axis of the hole from the cotter pin in
gear shaft 22-1.
Lock the upper carriage in traveling position with travel lock
Sb17-2 (fig 8).
? Using a dynamometer, measure the fox-6e required to move the
traversing. handwheel. The force requtred to move the handwheel should
be from 30 to 50 kg (under which slippage of the clutch plates should
occur). Make this check after each half-revolution of the handwheel for
five revolutions.
13 871
If the force required to move the handwheel is less than 30 kg,.
remove the Cotter pin and tighten the clutch plates by tightening nut
22-13. A change of no more than 1 mm (1/2 turn of the nut) is allowed
in the position of the horizontal line and nut 22-13 in relation to the
axis of the hole for the Cotter pin.
? After-tightening the plates, check the force required to move the
handwheel as specified above. If the force is less than 30 kg, take .
apart the worm gear case and inspect the clutch plates and dished-disk
springs 22-7.
If the clutch plates are covered with grease, wipe them dry. If
the dished-disk springs are broken, replace them (appendix 1)'. Next,
reassemble the worm gear case and tighten the clutch plates until the
horizontal line on nut 22-13 coincides with the axis of the hole for the.
cotter pin.
Install the case on the gun and check the force required to turn the
handwheel. If that force is less than 30 kg, tighten nut 22-13 no more
than a.half turn and check again the force required to turn the handwheel.
That force should be from 30 to 50 kg. Remove the old line on the face
of the nut and make a new line 0.5 mm in width and depth along the axis
of the hole for the cotter pin.
If, after tightening the clutch plates (in the absence of broken
disk springs 22-7),.the force required to move the handwheel is less
than 30 kg, replace the dished-disk springs (appendix 1) and adjust
the tightness of the clutch plates.
- -50X1-HUM__-__ _
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Increased Total Clearance Between From Clamp 17-70 and the
Lower Surface of the Edge of the Lower Carriage -and Between
the Bearing Surfaces of the: Upper and. Lower Carriages
(figure 8)
50X1 -HUM
Place the gun on a level surface in combat position. Operating the
traversing mechanism, place the barrel in a position appr9ximately midway
between the trails.
Measure the clearance between the bearing surfaces (in the front
parts) of the upper and lower carriages and between the front clamp, 17-70
and the lower surface of the edge of the lower carriage.
The total clearance should be no greater than 2.5 mm.
AARM. If the total clearance is greater than 2.5 mm:
-- remove the front clamp from the upper carriage;
-- remove any roughness on the lower, bearing surface of the front
(text missing)
-- make a spacer (sketch 36), weld it to the upper bearing surface
of the clamp with an E42 electrode, and trim the weld seam flush with
the spacer;
-- place the front clamp on the upper carriage and determine the
degree of non-coincidence of the holes in the clamp with the threaded
holes in the upper carriage for bolts A51000-56. Next cut three oval
holes in the clamp; [text missing]
-- fasten the clamp on the upper carriage with three A51000-56 bolts
and enlarge the four, holes in the clamp and upper carriage for adjusting
pins 17-73. The diameter of the holes may be increased to 23 mm;
-- make four adjusting pins-17-73 of the actual diameter of the
holes in the clamp (appendix 1, sketch 232) and insert them in the holes.
p 883
[P89]
50X1-HUM
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50X1 -HUM
A
--
Cross section Ati.
Cegetai3 no /1/7
RI .t.0
n
atfil (h ? I; )- fj
_
- width of groove of front clamp 17-70
h - thickness of edge of lower carriage
hi - thickness of edge of upper carriage.
Material: steel E30-40
Blunt sharp edges.
Sketch 36. Spacer
50X1 -HUM
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Stop 17-9 Does Not Securely Lock the Tapper Carriage to
the Lower in the Traveling Position
(fi5 8)
Cause of Malfunction: spring 17-8 is broken or fatiOued.
'50X1-HUM.
By operating the traversing mechanism, place the upp4r carriage ip
center position and switch stop 17-9. from combat positioi to traveling
position.
The spring should immediately thrust stop 17-9 downward and lock?
the upper carriage.
PM. If the action of the, stop is sluggish or if it does not enter
the conical opening in the lower carriage, replace the spring with one
made by DARM (chart 3).
.7. Wear in the Junction of Stop 1,7-9 With the Openings in
Cylinder 17-7 and the Lower Carriage
(fig 8)
Lock the upper carriage to the lower carriage in traveling position
with stop 17-9 and with a :clearance gauge measure the ,clearance between
the lower surface of.lever pin 17-10 andJthe bearing surface of the
slot of cylinder 17-7(10 in fig. .8) -The clearance should be no leas
than 1 mm.
Detach the upper catriagefrom the lower and take apart the stop.
Measure the large diameter of the conical opening in the lower
carriage, the diameter of the opening in the cylinder, and the diameter
of the stop.
The difference between the diameters in each junction should be no
greater than 0.7 mm.
PM. If the difference in the'diameters,is less than 0.7_mm and the
clearance between the surface of -pin 17-10 and cylinder 17-7 is less
than 1 mm, file the bearing surface of the slot in the cylinder, so that
when the upper carriage is locked in traveling position the clearance
is between 2 and 2.5 mm.
AARM. If the difference in. the diameter's is greater than 0.7 417-
50X1-HUM
correct the oval shape of the openings in the cylinder and lower
by removing a minimum layer of metal. The diameter of the 'opening in the
cylinder and the large diameter of the conical,opening in the lower carriage
should be the same.
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The diameters may be increased up to 37 mil.
? 50X1 -HUM
Make/stop 17-9 with the true diameter of [text missing]
Assemble the stop, place the upper carriage on the lower, and
lock the upper carriage in the traveling position With stop 17-9.
With a clearance gage measure the clearance between the lower
Surface of lever pin 17-10 and the bearing surface of the slot in
cylinder 1777. .:The clearance should be no less than 3.5 mm. If the
clearance is less, file the bearing surface of the slot in cylinder
17-7.
8. Broken Teeth on Gear Shaft 22-1 and Arc 18-47
'(fig. 9 and 10)
p 90]
DARM, If a tooth of the gear shaft Or a tooth of the arc is broken
for any length and at a height of 5 mm from the top or for a length of
up to 15 mm and at any height, restore2.the tooth by welding on'i,ayers
of metal (chart 9).
If the teeth of the gear shaft are broken for a length greater than
1.5 mm and a height greater than 5 mm from the top, ? insert a dowel,
weld it in place, and machine it (chart 9).
9).
If two Or three teeth of the arc are broken, install an insert '(chart
50X1 -HUM
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Chapter Eight
?
Maintenance., of the Lower Carriage And Trails
-
1. he Gun Suspension System Does Not Function
jfig. 10)
PM. Place the gun on.a perfectly level" surface.
With the trails locked in. travelinipositien, cheek whether the upper
surfacesebaiancebeamsSbl&10 and Sb18.,11 and buffers 18-50 contaet.-
The balance beams should not contact the buffers.
. Check for'discOnnection of the suspension systen'with the trails -
extended in combat position. With the trails spread apart, pintles 18-18
ishould freely enter the aperturesA41-the'balance beams.
If the balance beams contact the buffers, 'take out the tor8ion bars
. _
and inspect them. If the torsion barvarebrOken or twisted,. replace
them (appendix 1)
[p 911
50X1-HUM
If pintles 18-18 do not enter the apertures in the balance beams
when the trail are extended in combat position, adjust the position of
the balance beams (with tails locked in the traveling position) by
either tightening or loosening coupling screw 18-39.. Length b, the
emergence of the threaded part of the coupling screw from the coupling
housing, should be no more than 55 mm.
If it is not possible to achieve disconnection of the suspension
system with the trails spread in combat position by the adjustment'
indicated, move appropriate torsion bar 18-32 to another slot and adjust
the position of the balance beam as indicated above.
Note: A turn of the torsion bar one slot corresponds to a dis-
placement of the apertures in the balance beams (for pintles 18-18) in
relation to the apertures in the combat locking lever of 32 mm.
After adjusting the suspension system, roll the gun on the ground
(rearwards or forwards 5-7 m) and check for disconnection of the spring
suspension system with the trails extended.
2. The Suspension System Does Not Disconnect
(fig 10)
5
Spread the trails until latched in the lower carriage. Pint30X1-HUM
,0
should freely enter the balance beam apertures.
[text missing)
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3. The Suspension System Does Not Connect
(fig.10)
50X1-HUM P 921
Bring the trails together into traveling position.: Pintles 18-18
should freely exit the balance beams and. should not project beyond the
front end of either the right or left,combat locking levers. The presence
of a pintle projection from the levers is determined by passing a clearance
gage between the end of the combat locking lever and the balance beams.
The reason for pintle projections and the means of eliminating them
are indicated below (see Chapter VIII, item 3 a, b, c)..
? PM. If the clearances in the junctions (see Chapter VIII, item 3, a,
b, c) do not exceed tolerable limits, place the pivots with, rods in
place and, with the trails locked in traveling position, mark a line on
pintles 18-18 near the end of the, combat locking levers. Remove the
pivots with rods from the trails, measure distance A from the end of the
pivot to the line (sketch 27) and width E (fig. 10) of the combat locking
lever, and determine the difference of the measurements a = A - E.
Cut off the front end of pintles (a 4- 2) mm according to sketch 37.
Causes of the malfunction:
a) Wear in.the junction of ball beating 18-21 with pintle 18-18 and
nut 18-2CL
PM. Take off casing Sb45-6 and remove pintle 18-18 with rod 18-74
from the trail.
When there is looseness in the coupling indicated above, tighten nut
18-20 to eliminate instability but make sure the ball bearing retains
free movement.
'Prick punch the nut at two points after tightening.
If tightening the nut does not eliminate instability, completely,
cut- off the end of the nut (sketch 38).
50X1-HUM
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1?5.4.5*
50X1 -HUM
.1-.2.5
-- ?
1 7.
1 i? 11' s* ?
\
Smooth- sharppi ,edges ?a? X.
.vpa ?
Ppuinyauthfr
0,-;cvi.Juix:11T1b.
..Oxidize
Sketch 37. 18-18
11=4?16,
pintle
Cpuinv:741,74...
'Smooth-oborp,e4p8
Sketch 38. 18..20 -
washer
A decrease in the length of the nut up to 21 mm is permissible, fp 931
?b) Wear in the jUnction of pin 18-77 with rod 18-74 and pin 18-76.
Measure the diameters of pin 18-77 and the apertures in rod 18-74
and pin 18-76. The difference of the diameters should be no more than
2.mm.
PM. When the difference of diameters is more than 2 mm, eliminate
the oval shape in the apertures of rod 18-74 and pin 18-76 by removing a
Minimum layer of metal, and replace pin 18-77 (appendix 1, sketch 240).
An increase in the diameter of the apertures up to 23 mm is permissible.
If the diameter of the aperture is more than 23 mm, weld the aperture
rod 18-74. with electrode E50A and machine it. Replace pin 18-76 ari50X14HUM
18.,77 (appendix 1, sketches 239 and 240)..
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c) Wear in the junction of. pin 18-76 and bracket 18-75 rrt" 1A-70
50X1-HUM
MeasAre.the diameters of the apertures in the bracket and the Pin.
The difference of the diameters in each junction should be no more
than 2 mm.
PM. When the difference of the diameters is more than 2 mm, eliminate
the oval shape in the bracket apertures by removing a minimum layer Of
metal and replace pin 18-76 (appendix 1, sketch 239). An increase in
the diameter of the/larger Aperture up to 43 mm and an increase in the
diameter of the smaller aperture up to 23 mm is permissible..
In the event that rod 18,-74 sticks to pin 18-76 in the eye, file' the
eye to a radius or R.= 17#1 (see sketch 39).
flU
3.7,1egut,i/ ?Machine
0.4P
efe--
t f
4 t
C,5.45'4,?
Z
A:3
1-0 070 -1-1
Machine flush'
Smooth sharp edges
Cznpt:
Sketch 39. 18-74-rod
50X1-HUM
I
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4.. Wear in the Junction of Pintle 18-18 and the Aperture
in Combat Locking Lever 18-16 or 18-17 and the Aperture in
Rocker Afrm Sb18-10 or Sb18-11
(fig. 10)
Measure the diameter of pintle and the diameter of the aperture in
the rocker arm.
The difference of the diameters should be no more than 2.5 mm.
DARM. If the difference of the diameters is more than 2.5 mm,
eliminate the oval shape in the balance beam apertures by removing a
minimum layer of metal and insert a bushing on the pintle (sketch 4o)
or replace the pintle (appendix 1, sketch 236).
r- ^LI
50X1-HUM
50X1-HUM
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. 17r2zoaxa dfiz accraa:-.zSiaz pyi,laurgu
50X1 -HUM
Preparation for mounting jacket
_ Weld recesses
with 350A
?
electrode
-7-.??I''
..,
if 1 ? ,-',, . - i ? %1`P
!II ;'/ ?v
I
2' ?
lao
40
Make from semicircular file liOO.. N 1 GMT 1465-5,3.. To drill two.
holes 0 7-0,4; anneal ends of file for length of 20 mm on each sicle.
Blunt sharp edges
:Sketch 102. 6 - semicirCular file
31?),/rOM
N7 3 overall
??
- nominal'diametet'of
bore between lands,
(caliber) of gun M.446
for gun M-47
l - Haw u 110flbhbi6
aliameMp. no nonsrm
ixanutlpitlatialla
MPYMW GWOUYAI-46
D,awyce oinn optIOLI.R.
M-47 .
Marnepuan.C177Gfib Crn 3
&mpg, pe6pa npumyaum
L
Size
Gun index
Pa3mep
A imm)
Material: steel St 3
Blunt sharp edges
: si.qaexc opy5u9
(,[2 -?83)?
ID -.99,4),
Sketch 103. Shank
f
50X1 -HUM
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?R
2,6
9.5-0.0
80
65
50X1-,HUM
V.,3 OCT Ant,HOE ?
?-Por, r.014a1itidei?
/.0?
,Mcnnoiivan: flalnyNn UM'
Oblppe6pa npumLeux:s
? Material: brass or bronze
Blunt sharp edges
[Sketch 104]
2.x
V 3 for the remainder
3 CC Illfibtf0E
4.5),45
3200
f
lx45?
y
2.
5071
Material:. steel St 3,
Blunt sharp edges ,
Sketch 105., 10 -
50X1 -HUM
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50X1-HUM
V3 for the remainder
V.3 OCTAIMHOE
51,5
2om8 PO/3
Material: steel,St 3
Sketch 106,. 11 handle
Vc7b overall
W 4 KPYrOM
Cross section
60 . Ce-qrliric no A'A
2,01778. M6=1
N 2 atria 012#0,4
? 163-
-Material: steel St, 3
Blunt sharp edges
S1etch1107. 12 7. plate
50X1-HUM
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50X1-HUM
?
' Saetlon along CC
oont:?,4
'r.a3p.e3 nr2E.,'E
)1-nowniaIthviblUduamempno
, nongi.4 (Ka nuop) Kthgr17:1 ripybbi pc3mep
cpjou.Q 14 ? 46
.D-tnO7tcc a1151.0Dyth.rn VI 4 7 R
-
- nominal diameter of boret,:
between lands: (caliber)
D 7 nominal-diameter of bore.
;between lands (caliber)
.:Of gun M-47;:
Material: oak or beech '
,
Sketch 108. 13 - abrading blade
50X1-HUM
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V#4.'
W
Li
? ?
230
Pavo3 iv /14 Section along CC
'4311fluiesai .4..alote 5 x 5
:1777-
Size Gun index
r -
,
50X1 -HUM
F ?
Ipileitocormeitire wig \-1;110tiltii Nto1':1.1,?ta Uttapc.lon: I ? - 2: ?
, ? . , . 1,1 ? )101,0 .
- nominal diameter of bore
!between lands (caliber)
of gun M-46
fl- nominal diameter of bore
between lands (caliber)
of gun M-147
Sketch 109?!, Device for removing .Metal from' grooves:
1 - cutting tool; 2 - body; .3.- guide collar; 1 - nut;
5 pin; rod; 7 - lever; [text Missing]
50X1-HUM
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50X1-HUM
im 4 for the remainder
'7C14 OCTAfibil0E
-laupuma'Hape347777gA
c7Thsaa7goyOu5;14-4.0
rnagiadiNopyo(JR14-47
35
Size
Gun index
I Pcumep
141-5emcopydup .
14-46
ftf-.47
a - 0,2
.b) 6
-
a - width of grooves in
barrel tube of gun M-46
width .,of...grooves in
. barrel tube of gun M-47
Material: steel UlOA
Temper 60-64 Rs
Sketch 110. cutting tool
50X1-HUM
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/4 overall
VC/ 4 KPYrOM
50X1 -HUM
fipuznamb no Ncitiany unt3ona
Fit to bore of barrel
. ,
Gun,
Sizes in ..
A-HOMUHOIMHbleloUilMehlp
no honpm(Knnu6p) Katona
mpybel opydr.a m-46
D-mo yre dnR opyOuR hi -47
viyoutia. Hama mpydbi
cm6ona ?Wog tv1-46
h-po otce OPR 0pv0p,vm- 47
pe aorrtipyobi
CfnObna ppyou? M-46
Lngle
utidetfci
Pa3mepbt8 Aim,
Yaon. .
apycluP
A.
5
e?
? Ai-46
Al),15
(A.24-a4
50581
M-47
1):ll'ills ..(1)'.2h)
--j,.4.
.7 a', .
Mamepuoi :1701-flylIbillig 66-5-3-2
ccinfibie pe5po npumynumb
nominal diameter of bore
between lands (caliber)
of gun M-46
D - same for gun M-147
k - depth of 'grooves in barrel
tube of gun M-46
h - same for gun M-47
- width of grooves in barrel I
tube of gun 14-46
I.
Material: brass LAZhTts
Blunt sharpedges
Sketch 111. guide collar :
50X1 -HUM
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Case 2. Bulges.jn'the bore are located at adistance? of more than
0.5 m from the muzzle face of the barrel:. .
. . .
7717- ,50X1 -HUM-
.
:a) Make .a device for trimmirigythe lands and grooves of the utilu
'(sketches-.97108)-.-r
/4.:.? ?
'b) With tie device (sketch 97)4Hremovethe raised metal7in7the area
.
of the bulge?ana POlish;being.careful:nOtto damagethe-adjatent sections
Of the bore.
,
device for'trimming the grooves'ef sketcies
?
109-Ill).'
d)- Remove metal from the grooves with the special device.
, e) To remove bulges, insert the device in the bore, placing the
cuttirig-toWin:the,grooves where the height of the bulge is at a
minimum; And aOust,the position of the 'cutting tool with the screw.
The cutting head iS'moired by lever 7 i(sketch 109). The cutting tool is
reinserted after each stroke of the cutting head.
f) Replace the cutting tool with a cat iron or copper lap made in
the shape of the cutting tool, lubricate the lap with boiled oil, and,
dusting with fine abrasive powder, .lap the grooves of the barrel tube.
g) Thoroughly scrub and rub the bore.
h) Check the repaired section of-tibore witb calipers.
j.) Checkjthe,rePaired,barrel;-by(firingifour/roundsseel'appendix 5),
taking preputionary measures. After firing the rounds, inspect the
repaired section of the bore.
B. Removal of bulges in the barrel tube by insertion of threaded plugs.
, ? ?
1. peterMine the diameter of the threaded p.lug. Saw and bore the ?
4:A
. hole for threading.-,
For,permissible.diameters
item 7.
0
of plugs and their location see Chapter Two,
2. Bevel the edge '5 x 45?.
3., Thread the holes in accordance with specified dimensions.
4. Nake a-plug (*sketch 112) with a length of L=(B+5) mm, where
'B is the thickness .of the wall of the barrel tube at the threz50x1 -HUM
(sketch' 113). The size of B is determined by the following 'formula:
B
2
[p 185]
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for gun M-47,
where: )7 is the outer diameter of the barrel tube in mm at the hole;
114.
)7 is the nominal diameter'of tfi6Ore between the lands (caliber)
of gun-M-461'
. No For.-.2.jgti Ss L1
D is the nominal' diameter of the bore between the lands (caliber)
of gun M-47.
[Text missing]
5. Make a template of sheet steel ?[telxt missing?] as shown in ticetch
6. Draw a line through theCepteriof the hole for the plug n' the
barrel tube. ? ?
7. Screw the plug in the hole flush with the outer surface of the
barrel tube.
8. draw a line on the face of the plug by continuing the line drawn
on the barrel tube.
9. Screw out the plg and file its ends according to the template
for a-length o +0.3 - caS"shown-lin sketch 112
B mm
-0.6
10. Screw in the plug flush with the surface of the barrel tube so
that the lines on the plug and the barrel tube coincide.
11. Inspect the bore in the place where the plug is inserted; making
sure ?that the radius of the recess in the plug coincides with the radius
of the barrel tube between the grooves.
Protrusion of the plug beyond the grooves is not allowed; it May
be recessed up to 0.5 mm.
12. Weld the plug to the barrel'tube with an ESOA electrode see
sketch 113).
? 13. Trim any projecting edges in the bore in the Place where the
plug is inserted with a small emery wheel attached to a wooden holder
14. Cut off and file the nrotrudihg portion of.the plug flush with-
the_outer surface of the barrel tube
P 186].
.50X1-HUM
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50X1 ?HUM.
0
+,
_ g
vi
a 4-7 I
5' 0 ,bri
'crii
h63
o.4.
+2 e0
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73 for the remainder
OCIAPIWOE
according to the actual diameter d of the plug
? no paKmutrecKomy amempy a np0(J1(14
20
345?
3.45?
Thickness - 1-2 =a.
romgwia /- 2 MN
Mamepuan:cmann
'Ocmpalepeopa npumynumb
S ? ?
' Pa3mep
i4H5exc opydu9
M-46
M-47
R(mm)
(.4.#24
0 ?2h)
Material: steel UlOA
Blunt sharp edges
4-Homul1anbithiCi duamemp no
namam (cal71.161)) K011(1'1112
mpg6bropydu9 hi ,
? D?mo cing Opyo7u9 M-47
K-217ynUilq HOpe3L1 alptjobi
cm8ona apyaus? Al -46
h-mo .7+ce dpa opydughi -47
J- nominal diameter of bore
between lands (caliber)
of gun .
ID - same for gun 111-47
k - depth of?grooves' in barrel
' tube of gun M-46 '
h same fOr gun M4,7
. Sketch lib. Template
50X1 -HUM
50X1 -HUM
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1-led u! PeWsseloeCI
Sanitized Copy Approved for Release 2013/09/20
CIA-RDP80T00246A031200180001-5
oi
0
C73 for the remainder
V3 OCTAl1bli0E
17
5x45?
0.1.4)
(CS
'73 for the remainder
----k71 3 OC bHOE
1,LcIttordi:s.g to actual diameter d
of 'plug .
flo cpammu,recKomy auomempy dnpa6Ku
J.
d
2
Thickness 1-2 mm
Torwthia 1-2A
peWe d IMWT:re
According to,
threads in ?
jacket
-- line
Material: steel KT45--.50
Blunt sharp edges
Sketch 33.5!. ? Plug
t'CMG.HC,1t1bICI a!,Laveinp 4
f;:) 11(,'?qP,m fk017141),*:cmci7 i>1
rr.--6b1 00yel.1,c M 766 WO.g.
,
i.
re:%?o -
nominal. diameter of bore Material: 1310A
between lands (caliber) Blunt sharp edges
of gun -M-46
Sketch 116. Template
1-led LI! Pe!Psseloaa
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15.; Wash the 'bore with warmsOapy.water and rub dry-;
. ?
. 16., Paint the exterior of the repaired area of the barrel tube the:
color of hecannon.'
.17. 'Check the repaired barrel by firing; then inspect the repaired
section of the bore.
?
C. Removal Of dents in the barrel jacket by insertion of threaded plugs.
1. ?PerformHsteps.1, 2, and 3 pf section B.
? 2. Make a plug (sketch 115) with the length 1=(B+3) rui, where B
is the thickness of the wall of the jacket at the place where the plug
is to be inserted.
? Fit the threads of the plug to correspond closely to those of the
jacket. 1
3. Make a template as shown in sketch 116 from sheet steel [text
missing?]
4. Draw a line through the center of the hole for the plug in the
jacket.
5. Screw the, plug into the hole!flush with the outer Surface of
the jacket.
6. On the face Of the plug draw a line forming a continuation of
the line 'drawn on the jacket. ?
7. [Text missing].
?
8, Screii in thee-plUg flush with the surface of.the jacket so that
. the lines on the plug and jacket coincide. .?
9.: _Inspect the bore Of the jacket in the place where. the plug is
inserted, making sure that the radius of the ?recess in the plug Coincides
with the radius .of the bore of the jacket. ?
Protrusion of the plug inside the jacket is not allowed; it may be
recessed up to:0.5.ml.
10. Weld the, plug to the jacket with an E50A electrode (sketch 113).
11, Trim any projecting' edges in the bore of the jacket in the place
where the plug is'inserted with a small emery.wheel attached to a wooden
holder.
50X1 -HUM
50X1 -HUM
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? 12. Cut off and file the protruding portion of the plug flush with
the outer surface of the jacket.
50X1-HUM
, 13. pint the.exterior of the repaired area of the jacket the color
of the gun. '
Chart. Two
Replacement of Cradle Guides 01-12 of the Barrel. Clamping
and Cradle Guide's 01-52 of the Breech Ring
Pieces
1. Remove the barrel and place it on trestles.
_2. ...Unscrew the grease. cups from-He barrel clamping pieces, drill
out the heads of rivets 01-13 fastehingthe cradle guides, and hammer.olit
the riVets..
? ? Bore holes 5..Mm in diameter and S - 10 mm deep in strews 01-14 and, [p 200]:
with the aid.of sqUare tapered punch, strew out screws 01-14 (sketch .117). .
. Remove Old cradle guides 01,1.2.'
4. Removed8 Screws 01-53 and detach cradle guides 01-52 (sketch 118).
!
5.- Mark the:cradle guides and the breech ring and qlapping pieces
with corresponding plinth marks.
. 6. Measure the thickness T Of the .guides on the,cradie maximum
dimension).
7, Make 4 cradle guides 01,12 (sketch 119) of bronze Br. AZhMts10,3-1.5.
.8. Fit the outer surfaces of cradle,guides.01-12 tightly to the
clamping pieces'. Make the fitting, by filing Surface -a (sketch 119). '
9. Make 2 cradle guides 01,52 Of bronze Br. lahMts10-3-1.5
(Sketch 120).
10. Measure the diameter of the hole for rivet.P1-13. If the' diameter
of the hole is 5 mm, bore and countersink a hOle according to sketch.121.
.11. Transfer the hole from the oldicradle guide to the new one and
mark it with the punch markon the old.eradle guide.
12. Bore and coUntersink holes in cradle guides 01-12 and 01-52 as.
marked (see sketches 119 and 120).
[p 204]
50X1-HUM
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:
45-.?
r-A
?
-0-- 4- 0+.
Cegekrue no AA
Cross section Sa
50X1 -HUM
Sketch 117. 01-12 -- cradle guide; 01-13 -- rivet; 01-14 -- sCrew.
? 50X1 -HUM
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Immul
4,1. ?
J
Cross section CO
begeHue miCC
Sketch 118. 0142
41011111b
cradle guide; 01-53
50X1-HUM
? screw
50X1-HUM
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'Jed pewssepeo
(/)
CD
C)
E
CD
6,
7:1
CD
CT)
CD
0
0
0
0
7:1
0
-0
CO
0
0
0
0
0
0
CO
0
0
0
Section along BB '
6'3 for ? the remainder
Pa3pe3no 55 V 3 OCTAIlbHOE
(C)
- 30-.14
B (C)
\\A .t
11.2 1
2
_
E:
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9-1-00081-00Z1-?0V917Z00108dC11-V10
Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Spring
no. Material
rviotim
$toc } size
IAJMN,N 9:11.010M,Ah
Mf
diameter len.
:tiuwerp d Alnua
DimenPAIN ?Rti?R;Ang
DII
14? MV-
.1?g .s Dia. Of
(spueninwmt.4.
I min Amt,pqp
working total - 011011001 /),,.
I MN
. patl(pmx
. "144"- 'mandrel .D 1
0
02-26 n-11
02-39 11 -II
08-19
V947
09-85
.09-95
12-21
12-55
12-94
12-127
17-8
19-38
19-52
19-133
19-437
29
,)-63
26%54
26-122
26-123A
_
270129
GOC2A
COC2A
6002A
11-!
n-i
6002A
11-11
11-11
(30C2A.
n-ii
GOC2A
n-II
117 Il
11-11
GOC2A
GOC2A
11-11
0 9+"
* -0,01
i40,
-0,0?
0,01
-0,02
1 r +0,01
5+0,01
?
2 ol0,o;
0,02
2
1,2
3
_ 0,5
2?0,05
1,51,1!
2.51y,
03
4 0,01
1.
4 0,01
g+ 0.01
? . -0,02
? -
r .10,01
. ??1,_ f{,fr.1
350
400
750
301
1430
700
500
- 310.
950
175
1100
67.)
650
700
475
1130
460
273
650
700
700
950'
5,9
7
33
11,5
21,5
9.2,2
11,5
1`)
27,5
1,5
25,5
13.5
14,s
22
II
2:),5
7
9
13,8
29,6
37
Ii)
29.
8,5
23,5
17,8
10,5
9,6
21,5
' 3,5
22,5
10,5
11,8
17
15,5
5
7
? 10,2
20
16
_9,97
9,5 '
3,6-
19,5,
5,7
91;
4,1
7.8
1,77
10,9
4,13
5
6,37
3,6
2
2,4
-1,2
9.86
12,75
7,5
25?1 -
31 ?1
45,5?2,3
39?1
177?5
35?1.5
32,7 ?2
14 ? 1
Si) I- 2
7,85?1
.112?5
56*2
52 ? 2,5
50j-. 2
3;4.2
ss.; ? .3
29.5-1,5
10
53 1.'2,5
52:1:3
42:1:2
1001 5
. 12 .
13?0,5
4,510,25
10:1-0,5
14?0,5
5;5:0,5
7,5
3
7
6
10-0,25
13?0,.5
10?0,5
7 ?
10?0,5-14-0,75
11?0,5
? 12
5.
3
11,5
14 ?0,25
15?0,5
6,5 ?0,25
12?0,5
16:0,5
7.5 ? 0,5
6,5
5
9
4
12?0,25
15:0,5
11,5:L0,5
8,5 ? 0,5
11.5:0,5
15,5 I 0.75 i
?
15,5:0,5
? 0,25
6,5:9,75
4,5 4-0,25
3,8
4,6
27,2
8,1
21,8
10,2
? 8,7
9,1
20
3.2 ?
90.6
9.6
10,7
15,2
7,2
13,7
1,6
0,5
(D
0
(D
--
CIA-RDP80T00246A031200180001-5
Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Note: 1. When spring steel of the
flow chart 3 and in the sketches is
spring steel of another quality, in
process ot heat treatment should be
specified resilient characteristics
operation of the mechanism.
50X1 -HUM?
quality indicated in the table of
absent, it is permissible to use
which case the necessary technological
selected so as to provide the
of the spring and guarantee normal
2. It is recommended that springs with outside diameters up to 10 mm
be made by hand, and springs with outside diameters of 10 mm or more be
made by machine.
,3. Anneal raw wire from steel 60S2A before coiling, heating it to
a cherry-red color and cooling it in air.
50X1 -HUM
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4111Cnti &MOB pa60(ar
HadAC
PadepqMoudinilla npOdammu
OpueignupoJawfbni &ay.-temp onpaexu
N6. of working coils
Coiling
Length of unopiled wire
Approx. diameter of mandrel
remaining
c?./ OCT Allbt101
17.4
npadap
L=520 Aim
D033,4 MM
Mamepuan: np000noxa -I
_
Material: wire P-I
PzL.
Right
L 520 mm
Do = 33.4 mm
Sketch 126. 12-38 spring
50X1 -HUM
50X1 -HUM
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remaining
ev0C74/1010E
50X1 -HUM
View at arrow A
80 no cmpanme A
RI
tlucno 6unnog paoovux
Hearn
Ilfluna pa3fiemnoti ngliambi
Opueminupeowthni duamemp onpa&cu
No. of working coils
'Coiling Left
Length of uncoiled spring L ,370 mm
Approx. diameter of mandrel D 19.7 min
P 5
n = 5
neeaR
L-370 A1/4
Do .19,71W4
mamegian: npo8onoma 17-1
Sketch 127. 12-43
111.01.1
Material: wire P-I
spring
50X1 -HUM
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remaining ?
OCTAIMHOE
3,14
61,
" R15
1st
4111C.170 eumKoe pa6ovuy
HaBuoma
Pa3eepignas? &am Toecznoira
Opuelimupotlowaiii &talk:amp 017425ial
No. of working coils
Coiling
Length of uncoiled wire
Approx. diameter of mandrel
P = 75
Left
L 615 mth
Do = 21.1 mm
n=Z5
flea
1.'615 1651
116= 21,1isfM
max npa547floar
Material: wire P-I
Sketch 128. 12-66 -- spring
50X1 -HUM
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remaining
OCT4/711HOE
50X1 -HUM
vurna &ma& pa6ovux
tialludma
Pa3OennioR dnuna npotionaxu
Opueffinupodovnb,6 duamomp 011pa8K12
?
No. of working coils
Coiling
Length of uncoiled wire
Approx. diameter of mandrel
11. I
nooks?
L-110 nim
D.= 21,11ot
ManrpoR: np000.aoria 17-1
P 1
Right
L 110 nun
Do = 21.1 mm
Material: wire P-I
Sketch 129. 12-89 -- spring
50X1-HUM
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remaining
UCTAfibilDE
061,TC gUrilD elll77106 n . 7 r0,5
tilltruomo npnaks?
Pa3fieptry1nan &am 171)00011On L. 133
Totalnumber of coils P = 7 ? 0.5
Coiling Right
Length of uncoiled wire L = 133
Wamepurzn: nxemr,sa /7-11
Material: wire P-II
Sketch 130. 24-80 -- conical spring
50X1-HUM
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I 04,(S4
' 173-'415
cp
50X1-HUM
(\, KPYrDiq '
Over all
Hecodna0eime tro1jol5 Nonalignment
f74.20cullo1803 of String ends up
1 to 3u I
1022a5
UuCII0 durna8 n-55
tialluMia nem
Pa38eprigina5i &tura flp0801101{11 1 L=440.mi4
Opuenmupodozmani pa3mcp onpa5tal Do= 21,5161M
MUMCpUall: Cgla176 60C24
'8oporitune
No, of coils
Coiling
Length of uncoiled wire
Approx. diameter of wire
P 5.5
Left .
L = 440 wa
Do = 21.5 mm
Material: steel 60S2A
Burnish
Sketch 131. 41-104 -- spring
50X1 -HUM
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II. Coiling the Springs by Hand tp -213]
. 1. Make a mandrel (sketch 132) from steer of any quality for
coiling the spring.
/
2. Fasten ;the end of the wire in the mandrel slots. . Press the
mandrel in a vise between two wooden blocks and wind the specified
number of spring coils on the mandrel.
3. Free the mandrel with the spring, remove the spring, extend ?
its coils to the specified Spacing, cut the spring to the appropriate
length, set the ends of the spring correctly, and adjust them.
4. Heat treat the spring (see below, Section IV).
d-a000rding to, the diameter of the
ti-nOGI.::MOMPg TWO00/701al nripellEbl spring wire
3 HPWrOli
? over all
50X1-HUM
Material: steel of any quality'
Afa 17761.311i2i7: C7710116 I7h70011 1447):41
OCrap,51.e peop6 ITUMF7E1Mo
Smooth sharp edges
Sketch 132. Mandrel
III. Coiling the Springs on asLathe
1. Make a.;, mandrel from steel of any quality for coiling the springs
(sketch 133).
50X1-HUM
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li'emove_face . HPYFO.P1
Th r lug screw overall
dimimo ntzny 1705 SWIM
xamymuto
I
...I_. _ 15 ----
According to
diameter of
wire
d. 0.5
the rib 5ttaAremp1i npalanoi?ZTht
'spring 11P1PWID161
220
???
'
50X1 -HUM
. Material: steel 9f any quality
1 Iti01770/7IMP: CMCIIII: 17,1/47tiOU Marillz: ,
Ocinp&le pitc nputT.T=rns ,
,
Smooth sharp edges
Mandrel
Sketch 133.
2. Mount the mandrel in the center of the turning lathe.
3. Set the feed lever according to the spacing of the spring.
Set the lever of the speed box to the minimum number of revolutions.
Tighten the wire in the carriage between two wooden blocks and fasten'
one end of the wire in the aperture on the mandrel. Wind the specified
!number of spring coils on the mandrel ,(sketch 134).
4. Remove the spring from the mandrel, cut the spring to the
appropriate length, set the ends of the spring correctly and adjust
them.
5. Heat treat the spring (see below).
50X1 -HUM
I.
[ID 214:
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Declassified in Part- Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
50X1 -HUM
Pa3pC3 no All'
Cross rection AAi
Sketch 134. Drawing of spring coiling on lathe
IV. Heat Treatment of the Springs
1. Place the spring in an iron box, heat in a furnace or forge
to a cherry-red incandescent' color, and cool (temper) in oil.
2. Clean the spring to a metallic shine.
3. Place the spring in an iron box,. heart in a.forge to a gray
temper color and cool in oil (tempering):
Note: 1. Heat red hot and temper only those springs made from,
steel 6082A. 2. Do not heat red hot springs from steel P but subject
them to tempering after coiling by heating according to the above
instructions to a brownish-yellow temper color (255?C) and cool in air.
Chart Four
Eliminating Eccentricity in the Striking of the Firing Pin
1. Drill the riveted part of the slide with a bit 15 mm in
diameter which has been ground almost to a 900 angle.
2. Remove the slide catch and take off slide 02-5A (or 02-5).
3. Measure difference T between the diameter of the opening in
slide 02-5A (02-5) and the diameter of arm trunnion 02-1A of the
breechblock lever.
[p 44]
216]
50X1 -HUM
I 4. Make an arbOr with a cutting tool for machining the arm trunnion
of the breechblock lever (sketch 135).
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flow? my mama
501
According to centeringX _-H UM
the lathe
Morse Cone
Kongo lil0p3e
A194
)
3a3opc xa3exxort macra
mexcly onopnratst siaocxo-
Crstaln aepxlsero 11,
Hero Cra}MOB npn Maktl?
MaibliON1 yi?Jte CR:101iC111131
Kattatoweilcst %lam opy-
Ann a nos:arms aa ay.u-
nyto gam crao.la yorns?
eat OK0:10 125 K a (cm.
r.n. VI, rt. 3, cr0)
Cymmapniat 3a3op c ne.
peasseil Nam aseauy ne-
peassitm 3axaarom 17-70 it
elmnert 1MOCKOCTb10 pe6pa
nisamero crauxa It meKay
onopnbrant IMOCKOCTAN111
aepxxero a nusxnero cran-
KOB ri. VII. 11. 5)
Yron noaopora xoxrp-
urroxa 08-28 nptt npnaa-
nee Kanatouleficx gam
?Hann yrioa B031314111C111151
or 0' xo 40-45? (cm. ra.
V, n. 5, cx(,)
Yro.1 pa3aopora spa.
maxnuericsi xacrit opy,inst
(cat. r.a. 1, n. 3, 430))
Ytspyrull 071'116 pyxonrx
C626-11 B 3aropatoxce11-
11024 MX/10;1(MM npst xpart-
neat aesom no.nowetrnit
,7110.11b101 Ii npx 1131160/1b-
mem yr.ne cmotrefien mo-
ns (cm. ra. XII, n. 6)
, 0,05-0,5 conpstxoc.
nOBeHtte onopsibIX 1410-
CHOCTC171 'He AonycKaerce
He. 60ape 4 Av...
He mettee 33'
-?253 (nonycK ua cym-
maptaaA yron 50'? 4-30)
He donee 20 XX
50X1 -HUM
50X1 -HUM
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
0
tho noaicART Vonepne
57 3a3op stenos npanuNt?
(no xoay) Koaccom it Goa.
TOM A51000-20 cex.ropa
26-75 (cm. ra. XII, n. 6)
58 BK.-Ix:gams: an itDm.
H.110,13eTCH .114 noapccco-
p1111:11111C npn cacacinut ii
paw:re:mu crannit (cm.
ra. VIII, nu. 2 it 3)
59 Oronopracn mull-
B noaoarentlit no-
Gocaomy (cm. ra. VIII,
rt. 6)
60', Hpitaeralo-r .it ynopb:
(manna 19-454) ynopam
intnincro cram:a np:: no-
aonicittin crantin no?Goc-
non (cm. ra. VIII, n. 7)
61 Yacpx:nnaercsi py-
Konixa C624-16 na crann.
lie croropom CG/9-1/6
(cm. ra. VIII. n. 16)
62 Yaepautaarrcn aana
19493 cronopoNt C619-119
a Gomm noaon:clinit (cm.
ra. VIII, n. 13)
Yaepammercs: xo-
poka C619-12 ann .yx-
;maxi: Garinitxon tta cm-
:tune c-ronopost 19434
(19-53) (cm. ca. VIII.
n. 17).
64 Yacpxrunaercn ui na-
me?rxa C619-70 cronopom
(cm. ra. VIII, n. 18)
65 3axpenanercrint 0M-
Kpar Ira CrallitHe crono-
pom C619-115 (cm. ti,. X,
n.
,66 YP,epXill11310TCR
AlitePICH C627-3 ii C627-41
mrra 3allepTIMMII 27-4 a
Kra:tome:mom noaoxie.
nun (cm. ra. XIII. rt. 4)
. 67 I .11erNoc-rb xona *Drum
(Cm. FA. XI, it. 1)
?
? 63
Re.111,04HIJ TeXHIPICCKHZ
xaputcpmcml, il114 Kolopux
pa3pein3e/Co BUny0:371,
opyAme 143 pCHOHTS
. ?
He mence 20 .wAc ?
,.50X1 -HUM
Hoapeccopasanne aoa.
nom 13K.1101.1aTbeR npit
cneaennis cram::: it EU-
KinziaTbcg npst pa3aeac-
HUH CraHHH
CT311:1111,1 ACCIii, ce,)
86
CTOttOplITCH an pyionr-
Ka C620-5 clonopom 20-55
Ha ocn aenoro noaoana
PyKoa7Ha .1o.7H:Ha cm-
norn7bcH c7onopom Ha
ocu aeaoro noaoaHa
20-25 (cm. Ea. IX, n. I)
87
Ycitauo na pyxoarRe
He 6onee 5 ?Ko
C620-5 JIC6CAKII npa ze-
iiarpy>euuiok .ne6caHe
(cm. ra. IX. n. 3)
88 '
YAcpxcurialoren Jut CCM.
HUHU C619-51 cronopnn
a noaometnin no-noxox:o-
Counnnot aoax:Hu pep-
xuraarbcH cronopamn
noaonietntu no-noxoaHOmY
1,W (Cm. ra. Vilt, n. 12)
50X1 -HUM
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
tiTO Boa:tenon* nponerxe
Demon Tooffiticcuitx
zapurcriteritN, twit icurophix
pa3pe4itactot sunycKaTb
?mote 143 mantra
89
so
91
92
93
94
95
96
? 97
se
Yaephataaercn pama
C6-16-17 nepeaua npy-
2uituamit 26-69 a cpeanem
110.10}KeM1111 (CH. r.l. XV.
a. 7)
Jleruocrb zoaa no.-tec
nepeaxa (cm. ra. XV,
n. 11)
Ioannina ?nepeanert
creuun cuennon no-an
46-214 -(46-113) (cm. ra.
XV, a. 1, call
YlettKa AMAKOCTH M3
/tom:pal-a (CM. GI. X,
nn. 2 it 3)
aocrarotien au xoa
.raroua aomupara ann
noxbema cumin lapis csa.
ma CTaffint c nepeana
npit nocraitoane MX
na nepeaon (cm. ra. X;
IL 4)
Vaepnuinaiorcn an cra-
MTh! BOMNpaTaMM a M0.1-
n1rom no.lonteiiiiit (cm.
r.-t. X. n. 5)
Haaeumocri, Epenaefina
cranial Ha insopire pasna
nepeaua
3a3o1) mentay onopiimia
Haocuocrnmn BL1crymo3
Bry.130-1 c upon Wre C11103
C609-10 H
HOrt raAun 1045 (cu. 1.1.
IV. a. 5. ?62)
Y.BCPINMS2eTCH .71H CTO-
nop C609-15 a no.uoixe-
FITOIX ?noxoanoe, H c6OC-
HOC, (Cu. TX IV, a. 1)
YcnaHe npa nepenoae
cronopa C609-15 113 na.-zo-
xcenan cnoxoanoe a no-
floacenne (6oeBoev a o6-
Pama nepeana A0aaata
yaeptunaarben B seprit-
xaabitom 110.10)KCIIMH
He menee 40 .M.0 (nag
opyaa nocaeannic sbiny-
otos)
He MCMCC 36 Atm a ro-
pinouraawrost Hanpaaae-
Hitil .HC ',mime 45 Mil
a aeprnuanbitom Hanpan-
noun! opyana nep-
1361X BblityCKOB)
He aonycKa CUR
Xoa urroua A0d1M(CH
06CCITC411BaTh CMATHC CTa?
HHH C nepeaga H MX no-
craHoany Ha nepeaon
Craintubt AOIMCIIu )'aep-
nntliarbefi 'aomuparamii
B 110,THATOM' H0.10M(CHH11
CTOnOP Ao/Dmen YiteP-
SKIIDarbeil a 110.40MCMHSIX
cnoxoxioe) ac6oenoel, ?
-
YCHJIHe ?AIMS) tiCa07
Dena
?
50X1-HUM
.01,10arre?????,1MT
50X1 -HUM
npe.lassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
4i0 11044014(111' winglike
pamo npn cOcanuenint
pancanacuntl Ha-
KaTlittka C /110/1bKOri (CM.
ra. IV, rt. 5)
Cronopn7cn w aiyaka
c kponurrellnosi C609-10
clonopoNt 09.48 apsi
ycia-
cio:iope
C609-15 B 110.10A,
Lt. 13.) ?
.0 0
MC 0
0
4-i
0
0 ? p.
? < ?
1.4 s?
L.
t ?
/t?-?4--44 -!--:?-??-
-;-1 4 I-1
, ?
umitualoy
?50X1-HUM
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Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
Declassified in Part - Sanitized Copy Approved for Release 2013/09/20: CIA-RDP80T00246A031200180001-5
I 11111
a
4.
"
?
?
?
mom.
?LI ? Room
miammum
no
IIRIURU
vuiI.siai 1Z
s Nan am
111
? 5 OX1 -HUM
/
a) (.)
O 0 . . ?? .
CO ? corn ta
w
4., (:)0 1..
o = = z
x ? cu?.!-? a.,..
4. - "
a)", u il?
O k= x
.?..1 0 ..:
(1).<
A ???? fr...: "".
... 3
g
.4 t 2C
a. ,, g
w
A C. 14 c3
t... .,L
to
' g ei,4. tv ?-z
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?r-I r-I """ 4:
?0 rfl)1...?Z =a . ZI
g CO= < N3
ID 0 ? er)
0? 4-1`e. g:i 10
= 1-? ;ea
4-te 1.7 12
= CD