TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 650 of 991
TM 9-2320-272-24-2
3-461. REAR HUBS REPAIR
THIS TASK COVERS:
a. Removal
b. Cleaning and Inspection
c. Repair
d. Installation
INITIAL
SETUP:
APPLICABLE
MODELS
M939A2
SPECIAL TOOLS
Bearing punch (Appendix E, Item 12)
Air seal installer (Appendix E, Item 5)
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 145)
MATERIALS/PARTS
Seal (Appendix D, Item 629)
Seal (Appendix D, Item 630)
Hub seal (Appendix D, Item 497)
Ten lockwashers (Appendix D, Item 350)
GAA grease (Appendix C, Item 28)
Sealant (Appendix C, Item 30)
Abrasive cloth (Appendix C, Item 20)
Drycleaning solvent (Appendix C, Item 71)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
l
Front wheels chocked (TM 9-2320-272-10).
l
Spring brake caged (TM 9-2320-272-10).
l
Rear wheel(s) removed (TM 9-2320-272-10).
GENERAL SAFETY INSTRUCTIONS
l
When cleaning with compressed air, wear
eyeshields and ensure source pressure does not
exceed 30 psi (207 kPa).
l
Drycleaning solvent is flammable and toxic. Do
not use near an open flame.
l
Keep fire extinguisher nearby when using
drycleaning solvent.
a. Removal
1.
Remove brake drum (10) from hub (6).
2.
Remove ten screws (9), lockwashers (8), and axle shaft (7) from hub (6). Discard lockwashers (8).
NOTE
Tag inner and outer bearings for installation.
3.
Remove outer bearing nut (1) and washer (2) from spindle (5).
4.
Remove bearing adjusting nut (3) and outer bearing (4) from spindle (5).
CAUTION
Do not allow hub assembly to slide directly over threaded end of
spindle. Damage to air seals may result.
NOTE
Assistant will help with step 5.
5.
Remove hub (6) from spindle (5).
6.
Remove hub seal (13) and inner bearing (14) from hub (6). Discard hub seal (13).
7.
Remove snapring (11) and two air seals (12) from hub (6). Discard air seals (12).
3-1258
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