TM 9-2320-272-24-1
2-20. UNIT TROUBLESHOOTING INDEX
PAGE
PARA.
TITLE
NO.
NO.
Mechanical Troubleshooting
Electrical System Troubleshooting
Compressed Air and Brake System Troubleshooting
STE/ICE Troubleshooting
Central Tire Inflation System (CTIS) Troubleshooting
2-21. MECHANICAL TROUBLESHOOTING
NOTE
If malfunction corrective action does not correct malfunction,
notify direct support maintenance.
a . This section provides information to diagnose and correct malfunctions of the mechanical system at
the unit maintenance level.
b . This section cannot list all mechanical malfunctions that may occur. If a malfunction occurs that is
not listed in table 2-2, notify direct support maintenance.
MECHANICAL TROUBLESHOOTING SYMPTOM INDEX
TROUBLESHOOTING
MALFUNCTION
PROCEDURE
MALFUNCTION
NO.
PAGE
ENGINE
Engine will not crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.
Engine cranks but will not start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.
Starter cranks engine slowly, hard to start. . . . . . . . . . . . . . . . . . . . . . . .
3.
Engine stops during normal operation . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.
Engine stops when accelerator is returned to idle position . . . . . . . . . . .
5.
Engine fails to stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.
Engine misfires during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.
Engine idle rough, erratic (M939A2 only). . . . . . . . . . . . . . . . . . . . . . . . .
8.
Poor acceleration and/or lack of power . . . . . . . . . . . . . . . . . . . . . . . . . . .
9:
Enginesurges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.
Excessive engine oil loss or consumption . . . . . . . . . . . . . . . . . . . . . . . . .
11.
Engine oil pressure too low or too high at normal operating temperature
12.
Engine oil contaminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.
Excessive vibrating or clunking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14.
Excessive fuel consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.
ETHER START SYSTEM
Engine cranks but will not start in cold weather
16.
(fuel system operating properly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EXHAUST SYSTEM
Exhaust color blue during normal operation . . . . . . . . . . . . . . . . . . . . . .
17.
Exhaust color white during normal operation and idle . . . . . . . . . . . . . .
18.
Exhaust color black during normal operation and idle. . . . . . . . . . . . . . .
19.
Excessive exhaust noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20.
Exhaust fumes in cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21.
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