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TM 9-2320-279-20-1
Troubleshooting Index (Cont)
Table 2-8. Troubleshooting Subject Index (Cont)
Subject
Vehicle System
Page
Mast raises or lowers abnormally, slowly, or will not raise or lower . Material handling Crane
(M977, M985, M984A1) . . . .
Moisture in air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air . . . . . . . . . . . . . . . . . . . . . . . .
Noisy compressor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air . . . . . . . . . . . . . . . . . . . . . . . .
Noisy drive axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front and Rear Axle
Tandems . . . . . . . . . . . . . . . . . .
Noisy or vibrating propeller shaft or U-joints . . . . . . . . . . . . . . . . . . . . . Propeller shaft and
Universal Joints . . . . . . . . . . .
Noisy transfer case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer Case . . . . . . . . . . . . . .
Oil leaks in case area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer Case . . . . . . . . . . . . . .
Oil pressure low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine . . . . . . . . . . . . . . . . . . . .
One or more hydraulic circuits not working . . . . . . . . . . . . . . . . . . . . . . Hydraulic . . . . . . . . . . . . . . . . . .
One or more lights not working (warning or service lights) . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Outrigger cylinder will not retract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Material Handling
Crane (M983) . . . . . . . . . . . . .
Outrigger operation slow or abnormal or outriggers will not extend
or retract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Material Handling Crane
(M977, M985, M984A1) . . . .
Overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine . . . . . . . . . . . . . . . . . . . .
Parking brakes will not apply at front axle (M984A1) . . . . . . . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Parking brakes will not release at front axle (M984A1) . . . . . . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Power Takeoff Switch (PTO) will not engage . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Pressure buildup slow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air . . . . . . . . . . . . . . . . . . . . . . . .
Pressure drops over 25 psi at gage when brakes are applied . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Pressure drops rapidly after engine shutdown . . . . . . . . . . . . . . . . . . . . Air . . . . . . . . . . . . . . . . . . . . . . . .
Primary pump makes excessive noise . . . . . . . . . . . . . . . . . . . . . . . . . . . Tanker . . . . . . . . . . . . . . . . . . . .
Rear axle tandem out of line or not tracking properly . . . . . . . . . . . . . Suspension . . . . . . . . . . . . . . . .
Remote controller will not operate crane or operates abnormally . . . Material Handling Crane
(M977, M985, M984A1) . . . .
Retriever system will not lift load, will not lower load, or will not
center tow cylinders (M984A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Retriever . . . . . . . . . . . . . . . . . .
Safety valve fails to release system pressure at 150 psi (1 034 kPa) . Air . . . . . . . . . . . . . . . . . . . . . . . .
Service brakes fail to release or release slowly . . . . . . . . . . . . . . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Service lights not working . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Slips out of gear or operates abnormally . . . . . . . . . . . . . . . . . . . . . . . . . Transmission . . . . . . . . . . . . . . .
Spring brakes will not apply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Spring brakes will not release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dual Air Brake . . . . . . . . . . . . .
Steering wheel does not turn fully in either direction . . . . . . . . . . . . . Steering . . . . . . . . . . . . . . . . . . .
Stoplights do not work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Sudden increase in effort to turn steering wheel . . . . . . . . . . . . . . . . . . Steering . . . . . . . . . . . . . . . . . . .
Swing operation slow or abnormal in one or both directions . . . . . . . Material Handling Crane
(M977, M985, M984A1) . . . .
Switches do not work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Throttle treadle accelerates engine but no air pressure in
remainde of air system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air . . . . . . . . . . . . . . . . . . . . . . . .
Tires unevenly worn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wheels and Tires . . . . . . . . . . .
Trailer electrical system does not work . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical . . . . . . . . . . . . . . . . . .
Change 7
3
2-57
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