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 312 of 799
TM 9-2320-272-24-3
4-103. REAR DIFFERENTIAL OIL SEAL REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 145)
Mechanical puller (Appendix E, Item 102)
MATERIALS/PARTS
Oil seal (Appendix D, Item 500)
Cotter pin (Appendix D, Item 61)
Gasket (Appendix D, Item 208)
GAA grease (Appendix C, Item 28)
Sealing compound (Appendix C, Item 30)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
•
Parking brake set (TM 9-2320-272-10).
•
Rear wheels chocked (TM 9-2320-272-10).
•
Propeller shaft removed (para. 3-150).
a. Removal
1.
Remove cotter pin (7) and nut (8) from driveshaft (2). Discard cotter pin (7).
2.
Using mechanical puller, remove companion flange (6) from driveshaft (2).
CAUTION
Do not jam any tool between differential and pinion shaft retainer
when removing front bearing cover. Shims will be damaged.
3.
Remove six screws (9), washers (10), cap (4), and gasket (3) from differential carrier (1). Discard
gasket (3).
4.
Remove oil seal (5) from cap (4). Discard oil seal (5).
b. Installation
1.
Apply GM grease to inside diameter of new oil seal (5). Apply sealing compound to outside
diameter of oil seal (5).
2.
Install oil seal (5) in cap (4).
3.
Apply sealing compound to mating surfaces of new gasket (3).
4.
Install gasket (3) and cap (4) on differential carrier (1) with six washers (10) and screws (9). Tighten
screws (9) 24-40 lb-ft (33-54 N•m).
5.
Install companion flange (6) on driveshaft (2) with nut (8). Tighten nut (8) 300-400 lb-ft
(407-542 N•m).
6.
Install new cotter pin (7) through nut (8) and driveshaft (2).
4-576
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