TM 9-2320-260-34-1
MECHANICAL SYSTEMS TROUBLESHOOTING
SYMPTOM INDEX (Contd)
TROUBLESHOOTING
MALFUNCTION
PROCEDURE
MALFUNCTION
NO.
PAGE
DUMP BODY
Dump body will not raise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dump body will not lower........ . . . . . . . . . . . . . . . . . . . . . . . . . .
Dump body will not hold in raised position . . . . . . . . . . . . . . . . . . . . . .
MEDIUM WRECKER CRANE (M816)
Crane boom fails to swing (other hydraulic systems operate
satisfactorily) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crane swings erratically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom fails to extend or retract (other hydraulic systems operate
satisfactorily) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boom extends or retracts sluggishly.. . . . . . . . . . . . . . . . . . . . . . . . . .
Hoist w-inch fails to rotate, operates too slowly, or operates erratically . . .
Boom fails to raise or raises and lowers sluggishly . . . . . . . . . . . . . . . . .
TRACTOR WRECKER (M819)
Crane boom fails to swing (other hydraulic systems operate
satisfactorily) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HYDRAULIC LIFTGATE (M820A2)
Liftgate will not open or close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Platform does not stop at proper height. . . . . . . . . . . . . . . . . . . . . . . . .
Liftgate at incorrect angle when closed. . . . . . . . . . . . . . . . . . . . . . . . .
Liftgate fails cooperate on remote control . . . . . . . . . . . . . . . . . . . . . . .
Liftgate fails to operate on manual (lever) control . . . . . . . . . . . . . . . . .
WINTERIZATION KITS
Heater does not start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower runs in START position; heater fails to ignite . . . . . . . . . . . . . . .
Heater starts, but fails to run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater runs continuously in high or low heat . . . . . . . . . . . . . . . . . . . .
Heater overheats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower does not stop when heater is shutoff . . . . . . . . . . . . . . . . . . . . .
Heater fails to start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel burning heaters fail to turn on . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel burning heaters overheat overheat switch is good . . . . . . . . . . . .
Fuel burning heaters overheat continue to bum . . . . . . . . . . . . . . . . .
Heater output too low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater smokes and bangs when starting. . . . . . . . . . . . . . . . . . . . . . . .
Blower will not stop after turn off. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Odor of fuel in ventilating air (personnel heater only). . . . . . . . . . . . . . .
Blower runs but heater fails to ignite. . . . . . . . . . . . . . . . . . . . . . . . . .
Heater smokes during normal operation . . . . . . . . . . . . . . . . . . . . . . . .
WINCHES
Clutch will not engage drum (front and midship winches). . . . . . . . . . . .
Winch noisy under load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drum overruns cable or cable coils loosen when paying out cable
(front and midship tithes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winch (all types) does not hold load when power released. . . . . . . . . . . .
Winch (all types) leaks oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear winch operates atone speed only. . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
