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TM10-3930-660-20
2-12 .
MECHANICAL TROUBLESHOOTING
Refer to table 2-3 for mechanical troubleshooting procedures~ and use
the symptom index below to quickly locate a particular fault or
malfunction.
Because of its complexity, the mechanical troubleshooting is divided
into the following functional systems:
l Engine (page 2-25)
l Cooling System (page 2-37)
l Transmission (page 2-39)
l Axles and Differentials (page 2-43)
l Brakes (page 2-43)
l Steering (page 2-46)
l Hydraulic System (page 2-48)
MALFUNCTION
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
MECHANICAL TROUBLESHOOTING SYMPTOM INDEX
MALFUNCTION
TROUBLESHOOTING
PROCEDURE
PAGE
ENGINE
Engine cranks but fails to start . . . . . . . . . . . . . . . . . . . . ..2-25
Engine cranks but will not start - no
smoke from exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-25
Engine hard to start or will not start -
smoke from exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-26
Engine surges (speed change) . . . . . . . . . . . . . . . . . . . . . . . ...2-28
Engine starts but will not keep running . . . . . . . . . . . . ...2-28
Rough idle (irregularly firing or
engine shaking) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-30
Engine runs rough or misfiring . . . . . . . . . . . . . . . . . . . . . ...2-30
Engine RPM will not reach rated speed . . . . . . . . . . . . . . . ..2-3O
Low power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-31
Execssive exhaust smoke. . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-32
Engine lubricating oil pressure low . . . . . . . . . . . . . . . . ...2-33
Engine lubricating oil pressure too high . . . . . . . . . . . ...2-33
Engine lubricating oil loss . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-34
Contaminated engine lube oil . . . . . . . . . . . . ..... . . . . . . . .
2-34
Fuel or oil leaking from exhaust
manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-35
Compression knocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-35
Excessive fuel consumption. . . . . . . . . . . . . . . . . . . . . . . . . . ..2-35
Engine will not shut off . . . . . . . . . . . . . . . . . . .. 2-36
Excessive vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-36
Excessive engine noises . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-36
COOLING SYSTEM
Coolant temperature above normal . . . . . . . . . . . . . . . . . . . ...2-37
Coolant temperature below normal . . . . . . . . . . . . . . . . . . . . ..2-38
2-23
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