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 165 of 1015
TM 9-2320-272-24-1
Table 2-2. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check for loose dipstick tube.
If loose, tighten.
NOTE
Perform step 3 if deep water was forded.
Step 3.
Remove vent line from transmission. Start vehicle and build up air pressure. If air is coming
from line, notify DS maintenance.
END OF TESTING!
34. TRANSMISSION OIL DIRTY, FOAMY, AND/OR MILKY
NOTE
Dirt/grit in transmission oil indicates oil needs to be changed
(step 2). Foaminess indicates contamination by air or water
(step 3). Milkiness indicates contamination by coolant (step 4).
Step 1.
Check oil filter tube seal for damage and leaks.
a.
If damaged, replace seal (para. 3-133).
b. If leaking, tighten.
Step 2.
Check for dirt/grit.
a.
Replace transmission internal oil filter (para. 3-133).
b.
Replace transmission external oil filter (para. 3-133).
c.
Notify DS maintenance for transmission replacement,
Step 3.
Check for excessive foaming.
Ensure transmission fluid is at proper level (TM 9-2320-272-10). Drain or fill fluid as
necessary (LO 9-2320-272-12).
Step 4.
Check for coolant in transmission fluid.
If coolant is present in transmission oil, perform malfunction 24, step 2.
END OF TESTING!
TRANSFER CASE
35. HARD SHIFTING OF TRANSFER CASE
Step 1.
Check transfer case fluid level (LO 9-2320-272-12).
Fill or drain to proper level as necessary (LO 9-2320-272-12).
Step 2.
Inspect transfer case shift linkage for proper lubrication.
Lubricate linkage as necessary (LO 9-2320-272-12).
Step 3.
Inspect shift linkage for bends, breaks, and missing parts.
If shift linkage is bent, broken, or has missing parts, notify DS maintenance.
Step 4.
Check wire 586 for good ground.
Repair or replace wire (para. 3-131).
END OF TESTING!
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