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MECHANICAL TROUBLESHOOTING SYMPTOM INDEX - TM-9-2320-272-24-10152
Table 2-2. Mechanical Troubleshooting.

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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TM 9-2320-272-24-1
MECHANICAL TROUBLESHOOTING SYMPTOM INDEX
TROUBLESHOOTING
MALFUNCTION
PROCEDURE
MALFUNCTION
NO.
PAGE
WINCH
Winch does not operate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-84
59.
Winch operates in one direction only . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-85
60.
Drag brake does not operate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-86
61.
Winch will not hold load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-86
62.
Automatic brake overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-86
63.
Front winch operates at one speed only . . . . . . . . . . . . . . . . . . . . . . . . . .
2-86
64.
Rear winch cable tensioner will not operate. . . . . . . . . . . . . . . . . . . . . . .
2-86
65.
Vehicle rolls while operating rear winch. . . . . . . . . . . . . . . . . . . . . . . . . .
2-87
66.
POWER TAKEOFF (PTO)
Excessive noise at power takeoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67.
2-87
Hard shifting of power takeoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-87
68.
Leaking lubricant at power takeoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-87
69.
INSTRUMENTS AND GAUGES
Speedometer or tachometer noisy or erratic. . . . . . . . . . . . . . . . . . . . . . .
2-87
70.
Air pressure gauge inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-88
71.
Oil pressure gauge inoperative (oil level is correct) . . . . . . . . . . . . . . . . .
2-88
72.
RADIO INTERFERENCE SUPPRESSION
73.
2-88
Interference while vehicle in motion. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
74.
2-88
Interference only when engine is running . . . . . . . . . . . . . . . . . . . . . . . .
FIFTH WHEEL
Trailer will not hitch to fifth wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-88
75.
MEDIUM WRECKER (M936)
Hydraulic system does not operate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-89
76.
Hydraulic pump noisy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-89
77.
DUMP BODY (M929, M930)
Dump body will not raise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-89
78.
Dump body will not lower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-90
79.
Dump body will not hold in raised position . . . . . . . . . . . . . . . . . . . . . . .
2-90
80.
Hydraulic pump noisy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-90
81.
Tailgate will not open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-90
82.
EXPANSIBLE VAN (M934, M935)
Side panels hard to retract or expand. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-90
83.
Side panel cannot be locked in retracted position. . . . . . . . . . . . . . . . . . .
2-90
84.
Van body not waterproof or lighttight. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-91
85.
Door lock will not operate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-91
86.
2-91
Heater will not ignite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
87.
2-63






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