TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 418 of 799
TM 9-2320-272-24-3
4-130. FIFTH WHEEL MAINTENANCE
THIS TASK COVERS:
a. Disassembly
b. Cleaning and Inspection
c. Assembly
INITIAL SETUP:
APPLICABLE MODELS
M931/A1/A2, M932/A1/A2
PERSONNEL REQUIRED
Three
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 145)
Vernier calipers (Appendix E, Item 159)
Lifting device
Chains and attaching hardware
MATERIALS/PARTS
Cotter pin (Appendix D, Item 63)
Cotter pin (Appendix D, Item 64)
Three locknuts (Appendix D, Item 309)
Locknut (Appendix D, Item 296)
Two lockwashers (Appendix D, Item 388)
Lockwasher (Appendix D, Item 377)
Safety wire (Appendix D, Item 567)
REFERENCES (TM)
LO 9-2320-272-12
TM 9-2320-272-24P
EQUIPMENT CONDITION
Fifth wheel removed (para. 3-248)
GENERAL SAFETY INSTRUCTIONS
All personnel must stand clear during lifting
operations.
Eye protection must be worn when removing or
installing springs under tension.
Personnel must stand clear during release of
plunger rack.
Ensure lifting capacity is greater than weight of
fifth wheel.
a Disassembly
1.
Attach chain to fifth wheel housing (1) with two appropriately sized washers (2), screws (4),
washers (2), and nuts (3).
2.
Attach lifting device to chain. Apply tension to chain.
3.
Remove two lubrication fittings (8) from fifth wheel housing (1).
CAUTION
Do not use heat to remove pivot pins from fifth wheel housing.
Damage to equipment will result.
4.
Remove two retaining pins (6) and pivot pins (7) from fifth wheel housing (1) and base (5).
WARNING
All personnel must stand clear during lifting operations.
A swinging or shifting load may cause injury to personnel.
Ensure lifting capacity is greater than weight of fifth wheel
(600 lb) (272 kg). Failure to do so may result in injury to
personnel or damage to equipment.
5.
Remove fifth wheel housing (1) from base (5).
4-682
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