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 150 of 1015
TM 9-2320-272-24-1
MECHANICAL TROUBLESHOOTING SYMPTOM INDEX
MALFUNCTION
NO.
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
COOLING SYSTEM
Engine does not reach normal operating temperature.
..............
2-73
Engine overheats as indicated by engine coolant temperature gauge .
..
2-74
Loss of coolant.
.............................................
2-75
Contaminated coolant.
.......................................
2-75
TRANSMISSION
Excessive noise during shifting.
................................
2-75
Low transmission oil pressure
.................................
2-75
Transmission oil leaking.
.....................................
2-75
No response to shift lever movement
............................
2-76
Rough shifting.
.............................................
2-76
Transmission overheats as indicated by transmission temperature gauge
2-76
Dirt or metal particles in transmission oil
........................
2-76
Oil thrown from transmission dipstick tube.
......................
2-76
Transmission oil dirty, foamy, and/or milky
.......................
2-77
TRANSFER CASE
Hard shifting of transfer case.
.................................
2-77
Transfer case leaking oil.
.....................................
2-78
Excessive noise
.............................................
2-78
Excessive vibration
..........................................
2-78
PROPELLER AND DRIVESHAFTS
Excessive noise or vibration
...................................
2-78
FRONT AND REAR AXLES
Continuous axle or wheel noise.
................................
2-79
Oil leaking from front wheel drive lock-in switch.
..................
2-79
Differential noisy.
...........................................
2-79
Differential clunks during turns or initial takeoff
..................
2-79
Differential vibrates
.........................................
2-80
Differential leaks oil
.........................................
2-80
WHEELS AND TIRES
Uneven tire wear.
...........................................
2-80
Wheel shimmy or wobble
.....................................
2-80
STEERING
Hardsteering .
...........................................
2-81
Vehicle wanders or pulls to one side.
..........................
2-81
Excessive play in steering wheel.
...............................
2-82
Shimmy.
..................................................
2-82
FRAME AND BRACKETS
Towing pintle does not latch or lock
.............................
2-83
Pintle hook does not turn
.....................................
2-83
Excessively loose lifting shackle
................................
2-83
Loose spare tire carrier.
......................................
2-83
SPRINGS AND SHOCK ABSORBERS
Continuous wandering or swaying (poor control).
..................
2-83
Harsh or hard ride
..........................................
2-84
Spring leaf defect
...........................................
2-84
2-62
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