TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 874 of 1015
TM 9-2320-272-24-1
3-184. REAR BRAKE SPIDER REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
All
TM 9-2320-272-10
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 144)
MATERIAL/PARTS
Two lockwashers (Appendix D, Item 365)
Gasket sealant (Appendix C, Item 30)
TM 9-2320-272-24P
EQUIPMENT CONDlTlON
Brakeshoes removed (para. 3-180).
Service brake chamber removed (para. 3-181).
Combination spring (emergency) and service brake
chamber removed (para. 3-182).
All rear brake spiders are replaced basically the same. This
procedure covers right forward-rear axle.
a. Removal
1.
Remove eight nuts (l), washers (2), screws (5), and washers (2) from brake spider (4).
2.
Remove two screws (3) and washers (2) from inner side of rear axle housing flange (11).
3.
Remove brake spider (4) from axle housing assembly (10).
4.
Remove two nuts (9), lockwashers (8), screws (6), and clips (7) from brake spider (4). Discard
lockwashers (8).
Failure to tighten nuts in proper sequence can crack brake spider.
1.
Install two clips (7) on brake spider (4) with screws (6), new lockwashers (8), and nuts (9).
2.
Apply gasket sealant on rear axle housing (10) and brake spider (4) mating surfaces.
Assistant will help with step 3.
3.
Position threaded holes 3 and 4 of brake spider (4) on axle housing mating surface at 3 and 9 o’clock
positions, and install two washers (2) and screws (3) through back of flange (11) into threaded holes 3
and 4 of brake spider (4).
4.
Install eight washers (2), screws (5), washers (2), and nuts (1) through brake spider (4) and
flange (11). Tighten nuts (1) 110-145 lb-ft (149-196 N•m) in sequence shown.
3-510
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