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 636 of 991
TM 9-2320-272-24-2
3-456. FRONT WHEEL VALVE MAINTENANCE
THIS TASK COVERS:
a. Removal
b. Cleaning and Inspection
c. Installation
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M939A2
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
EQUIPMENT CONDITION
●
Parking brake set (TM 9-2320-272-10).
●
Air reservoirs drained (TM 9-2320-272-10).
Three locknuts (Appendix D, Item 334)
Three lockwashers (Appendix D, Item 400)
O-ring (Appendix D, Item 437)
O-ring (Appendix D, Item 487)
Four locknuts (Appendix D, Item 273)
Antiseize tape (Appendix C, Item 72)
GENERAL SAFETY INSTRUCTIONS
Eyeshields must be worn when releasing
compressed air.
a. Removal
1.
2.
3.
4.
5.
6.
7.
8.
WARNING
Air system components are subject to high pressure. Always relieve
pressure before loosening or removing air system components.
Remove cap (2) and valve stem (3) from tank valve (5), and allow tire (18) to deflate completely.
Install valve stem (3) and cap (2) on tank valve (5).
Remove two locknuts (27), washers (26), screws (28), washers (29), shield (1), and spacer (25) from
studs (16) and axle flange (20). Discard locknuts (27).
Remove hose (15) from elbow (7) and turret valve (17).
Loosen nut (14) and remove air manifold (22) from wheel valve (4).
Remove screw (24), washer (23), air manifold (22), and O-ring (21) from axle flange (20) and air
tube (19). Discard O-ring (21).
Remove two locknuts (8), washers (9), washers (10), and wheel valve (4) from studs (16). Discard
locknuts (8).
Remove three locknuts (13), lockwashers (12), and bracket (11) from wheel valve (4). Discard
locknuts (13) and lockwashers (12).
Remove elbow (7) and O-ring (6) from wheel valve (4). Discard O-ring (6).
NOTE
For repair of wheel valves, refer to para. 3-461.
b. Cleaning and Inspection
1.
For general cleaning instructions, refer to para. 2-14.
2.
For general inspection instructions, refer to para. 2-15.
3.
Inspect wheel valve (4) for cracks, leaks, and stripped threads. Replace or repair wheel valve (4) if
cracked, leaking, or threads are stripped.
4.
Inspect bracket (11), shield (1), air manifold (22), hose (15), spacer (25), elbow (7), and turret
valve (17) for cracks, bends, or stripped threads. Replace parts if damaged.
3-1244
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