TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 685 of 991
TM 9-2320-272-24-2
MALFUNCTION
NO.
MECHANICAL TROUBLESHOOTING INDEX (Contd)
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
Low air pressure (no air leaks, governor properly adjusted and
operative).
................................................
4-12
Air compressor passes excessive oil (excessive oil bled from air
reservoirs) .
...............................................
4-12
Air compressor does not unload (air governor adjusted and operative) . .
4-12
Air compressor head leaking water.
.............................
4-13
STEERING
Steering wheel hard to turn
...................................
4-13
Excessive power steering pump noise.
...........................
4-13
Oil leaking from steering pump
................................
4-13
Steering gear leaking oil.
.....................................
4-13
Excessive play at steering wheel.
...............................
4-13
FRONT/REAR AXLES
Excessive play (backlash)
.....................................
4-14
Excessive noise
.............................................
4-14
Lubricant leaking
...........................................
4-14
DUMP BODY
66.
67.
68.
60.
61.
63.
64.
65.
56.
57.
58.
59.
53.
54.
55.
48.
49.
50.
51.
52.
46.
47.
45.
44.
Dump raises to full dump position, but does not power down
.........
4-14
Dump body does not hold in raised position
.......................
4-14
Hoist assembly does not raise dump body
........................
4-14
Dump hoist is inoperative or operates slowly.
.....................
4-15
MEDIUM WRECKER CRANE
Boom does not respond properly when boom control levers are moved . .
4-21
All boom controls operate abnormally.
...........................
4-32
Swing control operates abnormally; all other controls operate normally.
Crowd control operates abnormally; all other controls operate normally.
4-32
4-32
Hoist control operates abnormally; all other controls operate normally. .
4-32
Boom control operates abnormally; all other controls operate normally .
4-32
POWER TAKEOFF
Noisy power takeoff.
.........................................
4-33
Power takeoff slips out of gear
.................................
4-33
Lubricant leaking.
..........................................
4-33
FRONT WINCH
69.
Front winch is inoperative or operates slowly
.....................
4-33
AIR COMPRESSOR
4-3
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