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 318 of 799
TM 9-2320-272-24-3
4-106. AXLE LEAKAGE TEST
THIS TASK COVERS:
a. Test
b. Corrective Action
INITIAL SETUP:
TOOLS
EQUIPMENT CONDITION
General mechanic’s tool kit (Appendix E, Item 1)
• Parking brake set (TM 9-2320-272-10)
Air pressure gauge
• Rear wheels chocked (TM 9-2320-272-10).
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
1.
Remove breather (1) from axle housing (4).
2.
Install nipple (9) and tee (6) on axle housing (4).
3.
Install air pressure gauge and quick-disconnect coupling (7) on tee (6).
CAUTION
Do not allow air pressure to exceed 15 psi (103 kPa). Seals will be
damaged if air pressure exceeds 15 psi (103 kPa).
4.
Connect air supply hose (8) to quick-disconnect coupling (7).
5.
Turn on air supply and observe air gauge. When air pressure reaches 8 psi (55 kPa), disconnect air
supply hose (8). Begin timing for a period of 45 seconds. After 45 seconds, check air gauge reading.
6.
If air gauge reading indicates leakage of 5 psi (35 kPa) or faster, perform corrective action
(task b.).
b. Corrective Action
1.
Tighten all axle housing (4) and differential carrier (5) nuts and screws.
2.
Reconnect air supply hose (8) to quick-disconnect coupling (7) and turn on air supply. When air
pressure reaches 8 psi (55 kPa), disconnect air supply hose (8).
3.
Apply soapsuds around front oil seal cover (2), rear oil seal cap (3), and base of differential
carrier (5) and axle housing (4). Air bubbles indicate defective or missing sealing compound. Remove
front oil seal cover (2), rear oil seal cap (3), or differential carrier (5) and reseal (para. 4-102, 4-103,
or 3-158).
4.
Remove quick-disconnect coupling (7), air pressure gauge, tee (6), and nipple (9) from axle housing (4).
5.
Install breather (1) on axle housing (4).
4-582
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