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Folks,

40 MM Mount Mk 4, OP 1329, 1947 describes the very widely used quad mount for the Bofors 40 mm gun of WW II.

Please report any problems with the Mail Feedback Form for correction.

Richard Pekelney
Webmaster

 


Restricted crossed out.
OP 1329
(FIRST REVISION)
40 MM
MOUNT MARK 4
ALL MODS.
23 SEPTEMBER 1941

 

RESTRICTED UN-CLASSIFIED OP 1329
(FIRST REVISION)


40 MM

MOUNT MARK 4

ALL MODS.

Department of the Navy - Bureau of Ordnance

23 SEPTEMBER 1947


This publication is RESTRICTED and will be handled in accordance with Article 76, United States Naval Regulations, 1920

 

II
 

NAVY DEPARTMENT
BUREAU OF ORDNANCE
WASHINGTON, D. C.

23 September 1947

RESTRICTED

ORDNANCE PAMPHLET 1329 (FIRST REVISION)

40-MM MOUNT MARK 4 ALL MODS

1. Ordnance Pamphlet 1329 (First Revision) describes and illustrates the construction and operation of the 40-mm Mount Mk 4 All Mods equipped with Power Drives Mark 9. It also includes instructions for the maintenance and care of mount and power drives.

2. This publication contains information pertinent only to 40-mm Mounts Mk 4 and Mods and should not be used for other 40-mm quadruple mounts.

3. This publication supersedes Ordnance Pamphlet 1329 (Preliminary), which should be destroyed. Reference should be made to Ordnance Pamphlet 820 for information on the 40-mm Gun Mechanism; Ordnance Pamphlets 867 and 867A for Gun Ballistic Data; Ordnance Pamphlet 762 for Mount Alignment methods; and Ordnance Pamphlet 1233 for information on the Gun Fire Control System Mk 63.

4. This publication is RESTRICTED and shall be safeguarded in accordance with the security provisions of U. S. Navy Regulations, 1920, Article 76.

A. G. NOBLE
Rear Admiral, U. S. Navy
Chief of the Bureau of Ordnance

 

III
 
TABLE OF CONTENTS
 
CHAPTER 1
General Description and Operation of the 40 MM Mount Mark 4

Page
Characteristics 1
Design Features and Arrangement 3
General Information 5
Working Circle Diagrams 9
Design Differences 9
Operation 33
Personnel 33
Functional Operation 33
Preliminary Preparations 34
Operating Instructions 35
Automatic Control 35
  Train 35
  Elevation 36
Local Control 37
Manual Control 38
  Shifting from LOCAL to MANUAL 38
  Shifting from MANUAL to LOCAL 38
Use and Operation of Sights 38
Loading 39
Readying the Guns for Firing 39
Firing 39
CHAPTER 2
40 MM Stand Mark 4 Mods 0 and 1
General 41
40 MM Stand Mk. 4 Mod. 0 41
40 MM Stand Mk. 4 Mod. 1 41
Detailed Description 42
Stand 42
Training circle 42
Roller paths 42
Bearing separators and rollers 42
Water seal 43
Cable housing locating plate and seal ring subassembly (used with 40 mm Stand Mk. 4 Mod. 0) 43
Collector ring housing locating plate and seal ring subassembly (used with 40 mm Stand Mk. 4 Mod. 1) 43
Train buffer stops 43
 
Page
Instructions 43
General maintenance 43
Disassembly and Assembly 43
General instructions 43
Removal of cable housing (or collector ring housing) 43
Disassembly of carriage unit from stand 44
Cleaning and inspection of stand parts 46
Assembly of stand 47
CHAPTER 3
40 MM Carriage Mark 4
General 51
40 MM Carriage Mk. 4 Mod. 0 51
40 MM Carriage Mk. 4 Mod. 1 51
40 MM Carriage Mk. 4 Mod. 2 51
40 MM Carriage Mk. 4 Mod. 3 51
40 MM Carriage Mk. 4 Mod. 6 51
Detailed Description 51
Right and left-hand carriages 51
Right and left-hand trunnion bearing blocks 51
Upper and lower base rings 52
Collector ring assembly 53
Cable housing 54
Training and elevating gear assemblies 55
Training gear handwheel bracket assembly 55
Training gear lower gear box assembly 56
Training gear main gear box assembly 57
Training gear worm and pinion bracket assembly 58
Elevating gear assembly 58
Elevating gear pinion bracket assembly 66
Elevating gear worm drive and handwheel drive assembly (left-hand carriage) 66
Elevating gear worm drive assembly (right-hand carriage) 67
Elevating gear box assembly (left-hand carriage) 68
Elevating gear miter gear box assembly (right-hand carriage) 74
Elevating gear adjustable coupling 74
 

IV
 
Page
Train securing pin assembly 74
Elevating gear securing pin assembly 76
Seat and foot rest assemblies 78
Platforms and guard rails 78
Cooling tanks, piping, and tubing 78
Cooling tanks 80
Piping and tubing 80
Elevation and depression buffer assemblies 83
Train buffer assembly 85
Firing Mechanism Arrangement 91
Firing mechanism 91
  Firing mechanism housing assembly 92
  Clutch and gear reduction units 94
  Elevation take-off assembly 96
  Firing cut-out assembly 101
  Connecting linkages 101
Functional Operation of Firing Mechanism 101
  Operation-power firing 101
  Operation-manual firing 105
Elevation Take-Off Assembly 105
Train Take-Off 107
Firing Cut-out Assembly 107
Electrical Installation 111
  Flexible feeder cables 111
General Instructions 112
  General maintenance 112
  Lubrication 112
Disassembly and Assembly 112
Seat and Foot Rest Assembly (Left Side) 113
  Disassembly 113
  Assembly 114
Elevating Gear Securing Pin Assembly 114
  Remove from mount 114
  Disassembly 115
  Assembly 117
  Installation on mount 119
Elevating Gear Worm Drive, Elevating Gear Pinion Bracket, and Handwheel Drive Assemblies 120
  Removal of elevating gear worm drive, pinion bracket, and hand wheel drive assemblies 120
  Disassembly of elevating gear pinion bracket from elevating gear worm drive assembly 122
 
Page
  Disassembly of elevating gear worm drive and hand-wheel drive assemblies 122
  Inspection of worm drive assembly parts 127
  Assembly of elevating gear worm drive assembly for left-hand carriage 128
  Disassembly of elevating gear handwheel drive assembly 130
  Inspection of handwheel drive assembly parts 133
  Assembly of handwheel drive assembly 133
  Disassembly of elevating gear pinion bracket assembly 134
  Inspection of elevating gear pinion bracket assembly 135
  Assembly of elevating gear pinion bracket 135
  Installation of elevating gear worm drive, pinion bracket, and hand wheel drive 137
  Elevating gear worm drive assembly (right-hand carriage) 139
  Disassembly of elevating gear worm drive assembly (right-hand carriage) 139
  Assembly of worm drive assembly (right-hand carriage) 139
Elevating Gear Box and Power-Off Brake Housing Assemblies for Left-Hand Carriage 140
  Removal of elevating gear box and power-off brake housing 140
  Disassembly of elevating gear box assembly 141
  Inspection of elevating gear box parts 144
  Assembly of elevating gear box 144
  Installation of elevating gear box and power-off brake housing 146
Elevation and Depression Buffer Assemblies 146 Disassembly of elevation buffer assembly 146
Inspection of elevation buffer assembly parts 150
  Assembly of elevation buffer 150
Assembly of Anticipator Valve Housing Assembly-Switch End 150
Assembly of Anticipator Valve Housing Assembly-Valve Piston End 150
Assembly of Buffer Housing 150
Assembly of Anticipator Valve Housing Assembly to Buffer Housing Assembly 152
 

V
 
Page
Disassembly of depression buffer 152
Disassembly of depression buffer roller and lever assembly 152
Inspection of buffer roller and lever assembly parts 155
Assembly of depression buffer roller and lever 155
Assembly of elevation buffer roller and lever 157
Installation of elevation or depression buffer assembly 157
Firing Mechanism Elevation Take-Off Assembly 158
Disassembly of firing mechanism elevation take-off assembly 158
Inspection of firing mechanism elevation take-off assembly parts 161
Assembly of firing mechanism elevation take-off 161
Installation of firing mechanism elevation take-off assembly 165
Firing Mechanism Firing Cut-out Assembly 165
Removal of firing cut-out assembly from left-hand carriage 165
Disassembly of firing mechanism firing cut-out 166
Inspection of firing mechanism firing cut-out assembly parts 170
Assembly of firing mechanism firing cut-out 171
Installation of firing mechanism firing cut-out assembly on left-hand carriage 174
Assembly of Training Gear Lower Gear Box Assembly and Firing Mechanism Firing Cut-out 174
Removal of training gear lower gear box and firing cut-out assembly 174
Disassembly of training gear lower gear box 174
Inspection of training gear lower gear box assembly parts 179
Assembly of training gear lower gear box 179
Assembly of Cam Drive Gear Housing Assembly 183
Assembly of cam drive gear housing assembly and firing mechanism firing cut-out assembly to the lower gear box housing assembly 184
 
Page
Installation of training gear lower gear box and firing cut-out 187
Assembly of Firing Mechanism Housing 187
Removal of Firing mechanism housing assembly 187
Firing mechanism housing disassembly 188
Disassembly of switch assembly 192
Disassembly of Clutch and Gear Reduction Unit Assembly 193
Assembly of Clutch and Gear Reduction Unit 195
Assembly of firing mechanism housing 196
Assembly of Switch Assembly 196
Assembly of Switch Lever 197
Assembly of Mounting Bracket 197
Assembly of Manual Clutch Plate 197
Assembly of Firing Mechanism Housing 197
Installation of firing mechanism assembly 199
Training Gear Securing Pin Assembly 199
Removal of training gear securing pin 199
Inspection of training gear securing pin assembly 199
Assembly of training gear securing pin 202
Train Buffer Assembly 202
Removal of train buffer 202
Disassembly of train buffer 202
Disassembly of Check Valve 206
Assembly of Check Valve 206
Disassembly of Anticipator Valve Plunger Guide 206
Anticipator Valve Plunger Guide Assembly 206
Disassembly of check valve 206
Assembly of check valve 206
Inspection of train buffer 206
Assembly of train buffer and anticipator 207
Installation of train buffer assembly 208
Installation of train buffer-mount detached from deck 208
Installation of train buffer-mount secured to deck 209
Assembly of Train Buffer Stop 209
Elevating Gear Miter Gear Assembly (right-hand carriage) 211
Removal of elevating gear assembly 211
 

VI
 
Page
Disassembly of miter gear 211
Inspection of elevating gear miter gear assembly parts 211
Assembly of miter gear 211
Installation of elevating gear miter gear 214
Elevating Gear Adjustable Coupling Assembly 214
Disassembly of elevating gear adjustable coupling 214
Inspection of elevating gear adjustable coupling assembly parts 214
Assembly of elevating gear adjustable coupling 215
Training Gear Handwheel Bracket Assembly 215
Removal of training gear handwheel bracket 215
Disassembly of training gear handwheel bracket 215
Inspection of training gear hand wheel bracket assembly parts 217
Assembly of training gear handwheel bracket 217
Installation of training gear handwheel bracket assembly 219
Training Gear Main Gear Box Assembly 219
Removal of training gear main gear box assembly and power-off brake housing assembly 219
Disassembly of training gear main gear box 219
Inspection of training gear main gear box assembly parts 227
Assembly of training gear main gear box 228
Installation of training gear main gear box assembly and power-off brake housing assembly 230
Training Gear Pinion Bracket and Worm Bracket Assemblies 230
Removal of training gear pinion bracket and worm bracket 230
Disassembly of training gear pinion bracket 232
Inspection of training gear pinion bracket assembly parts 234
Assembly of training gear pinion bracket 234
 
Page
Disassembly of training gear worm bracket 236
Inspection of worm bracket assembly parts 236
Assembly of worm bracket assembly 238
Assembly of training gear worm bracket assembly on pinion bracket assembly 238
Installation of training gear pinion bracket and worm bracket 241
Collector Ring (40 MM Mounts Mk. 4 Mod. 6) 242
Removal of collector ring from mount 242
Collector ring and housing disassembly 242
Collector ring and housing assembly 243
Installation of collector ring housing on mount 243
Cable Housing (40 MM Mounts Mk. 4 Mods. 0, 1, 2 and 3) 243
Removal of cable housing from mount 243
Disassembly of cable housing 244
Assembly of cable housing 245
Installation of cable housing on mount 245
Trunnion Block Assembly 246
Removal of trunnion block from gun mechanism 246
Inspection of trunnion block assembly parts 246
Installation of trunnion block on gun mechanism 246
CHAPTER 4
40 MM Sight Mark 5 Mods 1 and 2
General 249
40 mm Sight Mk. 5 Mod. 0 249
40 mm Sight Mk. 5 Mod. 1 249
40 mm Sight Mk. 5 Mod. 2 249
Detailed Description 250
Operation 250
Instructions 252
Checking the Alignment 252
Adjustments 253
General Maintenance 253
Disassembly and Assembly 255
Removal of sight from gun mechanism 255
Disassembly of the sight 255
Assembly of the sight 256
Installation of sight on gun mechanism 256
 

VII
 
Page
CHAPTER 5
40 MM Shield Mark 4 Mods 0 and 1
General 259
Detailed Description 259
General Maintenance 260
Disassembly and Assembly 260
Precautions 261
Disassembly 261
Assembly 264
CHAPTER 6
40 MM Firing and Coolant Circuit Mark 4 Mod 0
General 267
Detailed Description 269
Coolant Pumps 269
Pump characteristics 270
Coolant Motors 270
Design data of the motors 270
Motor Starting Switches 270
General Electric switch 270
National Acme switch 273
Firing Motor Switches 273
Firing Selector Switch 274
Firing Motor 274
Design data of the motors 274
Firing Solenoid 276
Characteristics of the solenoids 276
Fuse Box 276
Instructions 276
Safety Precautions 276
Lubrication 276
General Instructions 277
Motors 277
Connections 277
Pumps 277
Seals 277
Draining 277
Starting Switches 278
Disassembly and assembly 278
General Instructions 278
Cooling Pump and Motor Assembly 278
Removal of cooling pump and motor assembly 278
 
Page
Disassembly of cooling pump 278
Cleaning and inspection of pump parts 279
Assembly of cooling pump 279
Cooling Pump Motor Assembly-Diehl Type 280
Disassembly of cooling motor 280
Inspection of cooling motor parts 281
Assembly of cooling pump motor 281
Cooling Pump Motor Assembly-General Electric Type 281
Disassembly of cooling pump motor assembly 281
Inspection of motor parts 282
Assembly of cooling pump motor 283
Assembly of cooling pump and motor 283
Installation of cooling pump and motor assembly 283
Firing Solenoid Assembly 283
Removal of firing solenoid 283
Disassembly of firing solenoid 283
Assembly of firing solenoid 285
Installation of firing solenoid 285
CHAPTER 7
Train and Elevation Power Drives
General 287
Principal Components 287
Train power drive 287
Elevation power drive 287
Component Location and Arrangement 287
Controls Methods and Data 289
Manual control 290
Local control 290
Automatic control 290
Train Drive Motor 290
Train Drive Motor Mounting Bracket 290
Train Synchro Assembly 290
Train Correspondence Indicator 291
Train Selector Lever Assembly 292
Train Clutch Switch Assembly 293
Train Power-Off Brake Assembly 294
Train Motor-Amplidyne Set 295
Amplifier Unit 300
Detailed Description of Amplifier Unit 300
Cabinet 303
 

VIII
 
Page
Control Amplifiers 303
Field Supply Unit 305
Thyrite Resistor Unit 309
Door Interlock Switch 309
Heat Exchanger and Blower Motor Assembly 309
Terminal Boards 310
Elevation Drive Motor 310
Data 310
Elevation drive motor mounting bracket 310
Elevation synchro assembly 310
Pointer's Control Panel 313
Elevating Gear Selector Switch and Clutch Switch Assembly 317
Local Control Station Mounting Bracket 318
Local Control Station 318
Elevation Motor-Amplidyne Set 322
Data 322
Elevation Power-off Brake Assembly and Power-off Brake Housing Assembly 324
Control Unit 325
Cabinet 325
Circuit breaker 325
Line contactors 327
Timing relay 327
Multiple voltage relays 328
Voltage relays 329
Thermal-induction type overload relays 329
Thermal-induction overload relay electrical resets 329
Thermal type overload relays 330
Thermal overload relay electrical resets 330
Local supply transformer 330
Field supply transformer 330
Fuses 331
Resistors 331
Capacitors 331
Terminal boards 332
Reactor assembly 332
Functional Description and Fundamentals 335
Introduction 335
Operation from order signals from gun director 335
Operation from order signals from mount station 336
 
Page
Relation of error to order signals in automatic 337
Relation of error to order signals in local 338
Direct and alternating currents 339
Generating the electric order signal in automatic 342
Stator Voltages of a Typical Synchro Generator for Various Positions of the Rotor 347
Generating the error signal 347
Speeds of synchros and signals in automatic 351
Generating the electric order signal in local 353
Generating the error signal in local 357
The control amplifier 358
The amplidyne 380
The drive motor and response 385
Field supply unit 386
Detailed Description of Electricalm Circuits and Operation 391
Introduction 391
Signal circuits (automatic) 391
Control amplifier (automatic)-right train or elevating 391
Control amplifier (automatic)-left train or depressing 394
General 395
Stabilizing circuits (automatic) 400
Basic synchronizing circuits (automatic) 405
Auxiliary synchronizing circuits (automatic) 412
Signal circuits (local) 419
Control amplifier (local) 422
Limit circuits (automatic and local) 422
Field supply unit 428
Control unit 439
Miscellaneous Circuits 445
Correspondence indicators 445
Filament circuits 447
Local control station limit pull-out switches 447
Synchro unit transformer 447
Location of Troubles 448
No response to "start" button 449
No response in local 449
 

IX
 
Page
Runaway in local 450
Excessive speed in local 451
Failure to stop at limit in local 451
No response in automatic 451
Runaway in automatic 452
Synchronizing at wrong point 452
Mount or guns follow order signal but with large errors 453
Mount or guns hunt or oscillate about signal 453
Testing Instructions for Amplifier Unit 453
Test Instructions for Control Amplifier 455
Check wiring of amplifier against wiring diagram 455
36-speed zero signal balance and power supply voltage 455
Low speed zero signal balance 455
36-speed operation 455
Low speed operation 457
Local power operation 457
Limit circuit a-c operation 457
Limit circuit local power operation 458
Operation of time delay 458
Stabilizing circuit operations 458
Resistance measurements 459
High potential test 459
Megger test 459
Anti-hunt and synchronizing velocity potentiometer settings 459
Train Amplifier 460
Elevation Amplifier 460
Train Amplifier 460
Elevation Amplifier 460
Train 460
Elevation 460
Resistor settings 460
Testing Instructions for Field Supply Unit 461
Operation 461
Hipot test 461
Zeroing Synchro Unit Control Transformers, Using a Standard Synchro Transformer 462
Train 466
Elevation 466
Point to Point Circuit Checks 467
 
Page
Terminal board voltages 467
Control amplifier (train) 467
Local Power, No Input 467
Local Power, Maximum Speed 468
Auto, Stationary 468
Auto, 10 Degree/Sec. Constant Velocity 468
Auto, ± 30 Degree Amplidyne, 9-Second Period Motion 469
Control amplifier (elevation) 469
Local Power, No Input 469
Local Power, Maximum Speed 469
Auto, Stationary 470
Auto, 10 Degree/Sec. Constant Velocity 470
Auto, ± 30 Degree Amplitude, 9-Second Period Motion 470
Resistance checks on control amplifier and field supply unit 471
Control Amplifier (Train or Elevation) 472
Field Supply Unit 474
Resistance checks on rotating equipment 475
Motor-amplidyne sets 475
Drive motors 475
Tachometers (synchro unit) 475
Blower motor (amplifier unit) 475
Adjustments 475
Introduction 475
Meter Connections 475
Motor-amplidyne sets 475
Control Unit 476
Control Amplifier Adjustments (R28, R30, and R33) 476
Emergency adjustment 476
Accurate adjustment 477
Local power operational adjustments and checks 478
Automatic operational adjustments and checks 481
Specified Errors 482
Amplidyne brush adjustments 483
Direct-axis brushes 484
Quadrature-axis brushes 485
Drive motor brush adjustment 485
Disassembly and Reassembly 486
General Instructions 486
 

X
 
Page
Train Drive Motor 491
Removal of Train Drive Motor 491
Removal of Train Drive Motor from Mounting Bracket 491
Disassembly of Train Drive Motor 491
Assembly of Train Drive Motor 491
Installation of Train Drive Motor 491
Train Power Drive Power-Off Brake Housing Assembly 493
Disassembly of Power-Off Brake Housing Assembly 493
Disassembly of Power-Off Brake Assembly 494
Disassembly of Solenoid Housing Assembly 495
Inspection of Power-Off Brake Housing Parts 495
Assembly of Power-Off Brake Assembly 497
Assembly of Power-Off Brake Housing Assembly 497
Train Synchro Assembly 498
Removal of Train Synchro Assembly 498
Disassembly of Train Synchro Assembly 500
Inspection of Train Synchro Assembly Parts 500
Assembly of Train Synchro Assembly 500
Installation of Train Synchro Assembly 500
Train Correspondence Indicator Assembly 503
Removal of Train Correspondence Indicator Assembly 503
Disassembly of Train Correspondence Indicator Assembly 503
Assembly of the Train Correspondence Indicator Assembly 504
Installation of Train Correspondence Indicator Assembly 505
Train Selector Lever Assembly 505
Removal of Train Selector Lever Assembly 505
Disassembly of Train Selector Lever Assembly 506
Assembly of Train Selector Lever Assembly 506
Installation of Train Selector Lever Assembly 506
Train Clutch Switch Assembly 506
 
Page
Removal of Train Clutch Switch Assembly 506
Assembly of Train Clutch Switch Assembly 507
Installation of Train Clutch Switch Assembly 507
Amplifier Assembly Unit 507
Removal of Field Supply Unit from Amplifier Unit 507
Installation of Field Supply Unit in Amplifier Unit 509
Removal of Elevation Control Amplifier from Amplifier Unit 509
Installation of Elevation Control Amplifier in Amplifier Unit 510
Removal and Installation of Train Control Amplifier Unit 510
Removal of Heat Exchanger from Amplifier Unit 510
Disassembly of Heat Exchanger 510
Assembly of Heat Exchanger 511
Installation of Blower Motor in Heat Exchanger 511
Installation of Heat Exchanger in Amplifier Assembly Unit 511
Removal of Thyrite Resistor Unit 512
Installation of Thyrite Resistor Unit 512
Elevation Drive Motor 513
Removal of Elevation Drive Motor and Mounting Bracket 513
Removal of Elevation Drive Motor from Mounting Bracket 514
Assembly of Elevation Drive Motor Assembly and Mounting Bracket 515
Elevating Gear Power Drive Power-Off Brake Housing Assembly 517
Removal of power-off brake housing assembly 517
Inspection of power-off brake assembly parts 518
Assembly of power-off brake assembly 519
Elevation Gear Synchro Assembly 523
Inspection of Elevating Gear Synchro Assembly Parts 526
Assembly of Elevating Gear Synchro Assembly 526
Miter Gear Bracket Assembly 526
Synchro Assembly Chassis Assembly 526
 

XI
 
Page
Generator Gear Assembly 532
Tachometer-Generator Assembly 532
Synchro Housing Assembly 533
Synchro Housing Cover Assembly 536
Installation of Elevating Gear Synchro Assembly 536
Pointer's Control Panel 536
Removal of pointer's control panel 536
Disassembly of pointer's control panel assembly 537
Assembly of Pointer's Control Panel Assembly 541
Assembly of Housing Assembly 541
Installation of Pointer's Control Panel 545
Elevating Gear Selector Switch and Clutch Switch Assembly 545
Disassembly of Elevating Gear Selector Switch and Clutch Switch Assembly 546
Inspection of Elevating Gear Selector Switch and Clutch Switch Assembly Parts 546
Assembly of Selector Gear Switch and Clutch Switch Assembly 546
Installation of Elevating Gear Selector Switch Assembly 550
Local Control Station 550
Removal of Local Control Station Assembly 550
Disassembly of Local Control Station Assembly 551
Inspection of Local Control Station Assembly Parts 558
Assembly of Local Control Station Assembly 558
Installation of Local Control Station Assembly 573
Local Control Station Mounting Bracket Assembly 574
Removal of local control station mounting bracket assembly 574
 
Page
Disassembly of local control station mounting bracket assembly 574
Assembly of local control station mounting bracket assembly 580
Installation of local control station mounting bracket assembly 582
CHAPTER 8
Installation
Preliminary Instructions 587
Finish Machining the Foundations 587
Drilling Holes in the Mount Foundation Ring 587
Drilling holes in the cable housing and train buffer stop foundation 589
Installation of the train buffer stop 589
Installation of the cable housing locating plate 590
Mount 590
Installation of the mount 591
Installation of gun barrels 595
Electrical Units 595
Installation 595
Mount Inspection and Testing 596
Safety precautions 596
Cleaning and lubrication 596
Mount operation 597
Testing of 40 MM Mounts 597
Operational Tests 597
Alignment and tramming 600
Alignment 600
Tramming 600
Manufacture and Installation of Firing Cut-Out Mechanism Cam 601
General description 601
Laying out the cam 603
Machining the cam surfaces 608
Finishing and heat treatment 610
Assembly of cam 610
Checking the cam 610
 

XII
 
Page
CHAPTER 9
Maintenance
General Instructions 611
Periodic Inspections 611
Daily 611
Buffers and power drive brakes 611
Carriage 611
Weekly 611
Carriage 611
Monthly 611
Carriage 611
Sight 611
Before firing 611
After firing 612
Lubrication 612
Lubrication facilities 612
Selection of lubricants 612
Table of Lubricants Prescribed 612
Ordnance Data 3000 612
Lubricating frequency 612
Exercising parts 629
Lubricating procedure 629
Lubrication charts 629
Stand 629
General Instructions 629
Detailed Instructions 629
Periodic exercise 629
Inspection 629
Lubrication 630
Training circle and training pinion 630
Water seal 630
Roller path thrust and radial roller bearings 630
Adjustments 630
Exposed surfaces 630
Holding down bolts 630
Carriage 630
General Instructions 630
Detailed Instructions 630
Periodic exercise 630
Inspection 631
Lubrication 631
Carriage 631
Cable housing (or collector ring housing) 631
Firing mechanism housing 631
 
Page
Training gear lower gear box assembly and firing mechanism firing cut-out assembly 631
Train, elevation, and depression buffers 631
Tram Check 632
Train tramming check 632
Elevation tramming check 632
Adjustments 632
Elevating gear pinion backlash adjustment 633
Elevating gear adjustment 633
Elevation and depression buffer system adjustment 633
Firing mechanisms adjustment 633
Exposed surfaces 634
Installation of oil seals 634
Oil seal installing tools 635
Trouble Analysis and Correction 635
Train elevation and depression buffers 635
Buffer piston sticks 635
Buffing action too severe 635
Mount will not train from stowed position 635
Guns will not elevate from stowed position 635
Excessive backlash between training pinion and training circle 635
Excessive backlash between elevating arc and pinion 635
Excessive effort required to train mount 635
Excessive effort required to elevate and depress guns 635
Failure to operate in automatic or local control 636
Cooling System 636
Draining and Refilling 636
Inspection 636
Coolant fluid 636
Sights 636
General Instructions 636
Shield 637
General Instructions 637
Firing and Cooling Circuit 637
General Instructions 637
Detailed Instructions 637
Motors 637
 

XIII
 
Page
Pumps 637
Starting switch 637
Fuse box 637
Trouble Analysis 637
No liquid delivered 637
Insufficient liquid delivered 637
Insufficient pressure 638
Motor runs hot 638
Lubrication 638
Power Drives 638
General Instructions 638
Detailed Instructions 638
Periodic exercise 638
Inspection 638
Lubrication 638
Amplidyne sets 638
Elevating gear and training gear synchro units 638
Local control station 638
 
Page
Trouble Analysis 639
Adjustments 639
Recharging of Housings 639
CHAPTER 10
Tools and Accessories 641
APPENDIX 1
Safety Precautions
Before Operating the Mount 647
Power Drive Emergency Operation 647
Changing Method of Mount Operation 647
Train Buffer Assembly 647
Elevation and Depression Buffer Assemblies 648
Stowing the Mount 648
Removing Subassemblies 648
Firing Cut-Out Mechanism 648
Firing and Cooling Circuit 648
Amplifier Unit 648
 

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