T M 9 - 2 3 2 0 - 2 7 9 - 1 0 - 1
Troubleshooting Index (Cont)
3 - 3 . T R O U B L E S H O O T I N G S Y M P T O M S ( C O N T ) .
T a b l e 3 - 1 . S y m p t o m I n d ex
Troubleshooting
Procedure
P a ge
A I R S Y S T EM
Air horn will not operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Buzzer sounds and AIR indicator is lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Loses pressure or AIR indicator lights and buzzer sounds during
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Trailer brake does not apply when service brake treadle or parking
brake is used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20
Windshield washer will not operate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
E L E C T R I C A L S Y S T E M
One or more lighting circuits not operating . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
E N G I NE
Cranks but fails to start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Excessive engine oil consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Fails to crank when engine start switch is turned to start position. . . . . 3-4
Low OIL PRESS gage indication.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Starts or runs roughly after proper warmup. Does not develop full
power or makes excessive exhaust smoke . . . . . . . . . . . . . . . . . . . . . . . 3-6
Will not stop running when ENGINE STOP switch is activated . . . . . . . . . 3-10
H Y D R A U L I C S Y S T E M
One or more hydraulic circuits will not operate . . . . . . . . . . . . . . . . . . . . . 3-25
Operates either too slow, too fast, or with jerky movements . . . . . . . . . . 3-25
M A T E R I A L H A N D L I N G C R A N E ( M 9 7 7 , M 9 8 5)
Boom operation abnormal when telescoping in or out. . . . . . . . . . . . . . . . 3-28
Boom raises or lowers slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29
Boom will not raise or lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Boom will not telescope in or out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
Crane controls sticking in engaged position . . . . . . . . . . . . . . . . . . . . . . . . . 3-32
Crane will not operate or operates abnormally. . . . . . . . . . . . . . . . . . . . . . 3-33
Hoist operation slow or abnormal when lifting or lowering load. . . . . . . . 3-34
Hoist will not lift load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35
Mast raises or lowers abnormally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
Mast raises or lowers slowly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
Outrigger operation slow or abnormal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-37
Swing operation abnormal in both directions . . . . . . . . . . . . . . . . . . . . . . . 3-37
Swing operation abnormal in one direction only . . . . . . . . . . . . . . . . . . . . 3-38
3 -2
