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 794 of 1015
TM 9-2320-272-24-1
3-155. STEERING KNUCKLE BOOT MAINTENANCE
THIS TASK COVERS:
a. Removal
b. Cleaning and Inspection
c. Installation
INITIAL SETUP:
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 144)
MATERIALS/PARTS
Steering knuckle boot (seal) replacement kit
(Appendix D, Item 676)
Four lockwashers (Appendix D, Item 377)
Lockwire (Appendix D, Item 419)
Cleaning cloth (Appendix C, Item 21)
Adhesive (Appendix C, Item 5)
REFERENCES (TM)
LO 9-2320-272-12
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
a. Removal
1.
Remove four screws (4), lockwashers (3), and seal guard (5) from steering knuckle (2). Discard
lockwashers (3).
2.
Remove twelve screws (7), safety wire (1), and retaining plate (6) from steering knuckle (2). Discard
safety wire (1).
3.
Pull one side of steering knuckle seal (12) aside to expose inner retaining clamp screw (10).
4.
Remove inner retaining clamp screw (10) and spacer (9) from inner retaining clamp (11).
5.
Remove seal (12) and inner retaining clamp (11) from steering knuckle (2).
NOTE
Some seals may not have a zipper.
6.
Open zipper (8) or cut to remove seal (12) from axle housing (13).
b. Cleaning and Inspection
1.
Clean surface of steering knuckle (2), retaining plate (6), and steering knuckle seal (12) with
cleaning cloth. Ensure there is no dirt or dust is inside steering knuckle (2).
2.
Inspect steering knuckle seal (12) for cracks, tears, and damaged zipper (8). Replace if cracked, torn,
or zipper (8) is damaged.
c. Installation
1.
Place steering knuckle seal (12) on axle housing (13), with fabric side of zipper (8) facing steering
knuckle (2).
2.
Close zipper (8) and apply large amount of adhesive to locks and fabric of zipper (8). Allow adhesive
to sit overnight.
3.
Force inner lip of steering knuckle seal (12) into groove on axle housing (13). Ensure steering
knuckle seal (12) is aligned to holes in steering knuckle (2).
4.
Position inner retaining clamp (11) to lip of seal (12) and install clamp screw (10) and spacer (9).
3-430
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