TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 338 of 836
TM 9-2320-272-24-4
5-48. FOURTH CLUTCH MAINTENANCE
THIS TASK COVERS:
a. Removal
b. Disassembly
c. Cleaning and Inspection
d. Assembly
e. Installation
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
All
TM 9-2320-272-24P
SPECIAL TOOLS
Spring compressor (Appendix E, Item 95)
Fourth clutch clearance gauge (Appendix E,
Item 47)
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Vernier caliper (Appendix E, Item 159)
Depth gauge (Appendix E, Item 81)
Spring tester (Appendix E, Item 131)
Arbor press
EQUIPMENT CONDITION
Forward clutch removed (para. 5-47).
SPECIAL ENVIRONMENTAL CONDITIONS
Work area clean and free from blowing dirt and
dust.
GENERAL SAFETY INSTRUCTIONS
Use care when removing piston return spring.
Spring is under great compression.
MATERIALS/PARTS
Piston inner seal ring (Appendix D, Item 515)
Piston outer seal ring (Appendix D, Item 516)
Lubricating oil (Appendix C, Item 47)
Oil-soluble grease (Appendix C, Item 53)
1.
Lift fourth clutch (1) straight out of transmission (4).
NOTE
Perform step 2 for transmissions with two-piece bearing.
2.
Remove bearing race (2) and bearing assembly (3) from fourth clutch (1) or transmission (4).
NOTE
Perform step 3 for transmissions with single-piece bearing
assembly.
3.
Remove bearing assembly (3) from fourth clutch (1) or transmission (4).
1.
Position piston return spring compressor on spring retainer (5) and place on arbor press.
WARNING
Piston return spring is under great compression. Do not remove
snapring until pressure is applied to spring retainer. If not, piston
return spring may fly out, causing injury to personnel.
2.
Apply pressure to spring retainer (5) and remove snapring (6) from fourth clutch (1).
3.
Carefully remove piston return spring compressor.
4.
Remove spring retainer (5), piston return spring (7), and optional spacer (8) from fourth clutch
housing (1).
5-332
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