TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 110 of 1207
TM 9-2320-361-20
MECHANICAL SYSTEMS TROUBLESHOOTING
SYMPTOM INDEX
MALFUNCTION
NO.
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
ENGINE
Engine will not crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-28
Engine cranks but will not start . . . . . . . . . . . . . . . . . . . . . . . . .
2-28
Starter cranks engine slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-29
Engine stops during normal operation . . . . . . . . . . . . . . . . . . . . . . . .
2-29
Engine stops when accelerator is returned to idle position . . . . . . . . . .
2-30
Engine misfires during operation . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-30
Poor acceleration and/or lack of power . . . . . . . . . . . . . . . . . . . . . . . .
2-30
Engine surges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-31
Excessive engine oil loss or consumption during normal operation . . . .
2-31
Engine oil pressure too low or too high at normal
operation temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-31
Excessive vibration or clunking . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-32
Excessive fuel consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-32
EXHAUST SYSTEM
Exhaust color blue during normal operation . . . . . . . . . . . . . . . . . . .
2-32
Exhaust color white during normal operation and idle . . . . . . . . . . . .
2-32
Excessive exhaust noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-33
Exhaust fumes in cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-33
MANIFOLD HEATER SYSTEM
Engine cranks but will not start in cold weather
(fuel system operating properly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
COOLING SYSTEM
Engine temperature gage above 230°F (110°C). . . . . . . . . . . . . . . . . .
2-34
Engine does not reach normal operating temperature. . . . . . . . . . . . .
2-34
Coolant loss during normal operation . . . . . . . . . . . . . . . . . . . . . . . .
2-34
FUEL SYSTEM
No fuel at fuel injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-35
PERSONNEL HOT WATER HEATER
Personnel hot water heater does not heat cab . . . . . . . . . . . . . . . . . .
2-35
TRANSMISSION
Transmission noisy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-35
Transmission leaks oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-36
CLUTCH
Clutch pedal will not travel or depress . . . . . . . . . . . . . . . . . . . . . . .
2-36
Vehicle creeps with clutch depressed. . . . . . . . . . . . . . . . . . . . . . . . .
2-36
Clutch drags, slips, or does not engage . . . . . . . . . . . . . . . . . . . . . . .
2-36
2-25
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