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 360 of 836
TM 9-2320-272-24-4
5-52. SECOND CLUTCH MAINTENANCE
THIS TASK COVERS:
a. Removal
c. Installation
b. Cleaning and Inspection
d. Establishing Clearance
INITIAL SETUP:
APPLICABLE MODELS
All
SPECIAL TOOLS
Second clutch clearance gauge (Appendix E,
Item 118)
EQUIPMENT CONDITION
Gear unit and main shaft removed (para. 5-51).
SPECIAL ENVIRONMENTAL CONDITIONS
Work area clean and free from blowing dirt and dust.
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Outside micrometer (Appendix E, Item 80)
Vernier caliper (Appendix E, Item 159)
a.
Removal
CAUTION
Second clutch consists of a backplate, four clutch plates, and four
clutch discs. Keep all clutch parts together. Intermixing second
clutch parts with any other clutch pack will cause transmission
damage.
NOTE
Tag all second clutch parts for reassembly.
Remove snapring (l), four clutch discs (5), clutch plates (2), and backplate (4) from transmission housing (3).
b. Cleaning and Inspection
Flying rust and metal particles may cause injury to personnel.
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para. 2-15.
3.
Inspect clutch plate (2) for burned surfaces. If burned, discard clutch plate (2).
4.
Inspect clutch discs (5) for burned surfaces. If burned, discard clutch disc (5).
5.
Measure backplate (4) thickness.
a. If thickness of backplate (4) marked No. 10 is less than 0.234 in. (5.94 mm), discard backplate (4).
b. If thickness of backplate (4) marked No. 11 is less than 0.208 in. (5.28 mm), discard backplate (4).
b. If thickness of backplate (4) marked No. 12 is less than 0.221 in. (5.61 mm), discard backplate (4).
5-354
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