TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 353 of 481
TM 9-2320-272-10
3-4
MALFUNCTION
NO.
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
3-4. TROUBLESHOOTING SYMPTOM INDEX (Contd)
39.
Ceiling lights and service receptacles fail to energize when
doors are closed under blackout conditions (110 volt system) . . . . . . . . . 3-15
40.
Emergency light, blackout light, and ceiling lights fail to
illuminate (24 volt system) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
41.
Heater will not ignite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
42.
Air conditioner compressor fails to start . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
SPECIAL PURPOSE KITS
RADIATOR AND HOOD COVER KIT
43.
Engine fails to reach operating temperature . . . . . . . . . . . . . . . . . . . . . 3-16
44.
Engine temperature exceeds 200°F (93°C) . . . . . . . . . . . . . . . . . . . . . . . 3-16
FUEL BURNING PERSONNEL AND ENGINE COOLANT HEATER KITS
45.
Fuel burning personnel heater fails to start when run-off-start
switch is held in start position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
46.
Engine coolant heater fails to start when run-off-start switch
is held in start position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
47.
Heater fails to continue burning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
48.
Windshield defrosters not operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
49.
Engine oil pan shroud not receiving heat (engine coolant
heater only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
50.
Engine coolant system not receiving heat (engine coolant
heater only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
A-FRAME KIT
51.
Winch inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
52.
A-frame misaligned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
AIRBRAKE CONTROL KIT
53.
Trailer airbrakes do not operate when airbrake control
handle is pulled down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
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