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 151 of 1015
TM 9-2320-272-24-1
MECHANICAL TROUBLESHOOTING SYMPTOM INDEX
MALFUNCTION
NO.
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
WINCH
Winch does not operate.
......................................
Winch operates in one direction only
2-84
2-85
............................
Drag brake does not operate.
..................................
2-86
Winch will not hold load
......................................
Automatic brake overheats
....................................
2-86
2-86
Front winch operates at one speed only
..........................
Rear winch cable tensioner will not operate.
2-86
......................
2-86
Vehicle rolls while operating rear winch.
.........................
2-87
POWER TAKEOFF (PTO)
Excessive noise at power takeoff.
...............................
2-87
Hard shifting of power takeoff
.................................
2-87
Leaking lubricant at power takeoff.
.............................
2-87
INSTRUMENTS AND GAUGES
Speedometer or tachometer noisy or erratic.
......................
2-87
Air pressure gauge inoperative.
................................
Oil pressure gauge inoperative (oil level is correct)
2-88
2-88
.................
RADIO INTERFERENCE SUPPRESSION
Interference while vehicle in motion. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-88
Interference only when engine is running . . . . . . . . . . . . . . . . . . . . . . . .
2-88
FIFTH WHEEL
Trailer will not hitch to fifth wheel.
.............................
2-88
MEDIUM WRECKER (M936)
Hydraulic system does not operate.
.............................
Hydraulic pump noisy.
.......................................
2-89
2-89
DUMP BODY (M929, M930)
Dump body will not raise
.....................................
2-89
Dump body will not lower.
....................................
Dump body will not hold in raised position
2-90
2-90
.......................
Hydraulic pump noisy.
.......................................
Tailgate will not open
2-90
2-90
........................................
EXPANSIBLE VAN (M934, M935)
Side panels hard to retract or expand.
...........................
2-90
Side panel cannot be locked in retracted position.
..................
Van body not waterproof or lighttight.
2-91
...........................
2-90
Door lock will not operate.
....................................
Heater will not ignite
........................................
2-91
2-91
2-63
Back to Top
