TM 55-4920-394-13&P
Table 3-6. Trouble Shooting (cont' )
d
TROUBLE
PROBABLE CAUSE
REMEDY
Main Pump
Defective low pressure switch
Check switches.
Motor stops
during
operation
(Continued)
Oil Cooler
Circuit breaker tripped to OFF
Reset circuit breaker.
Fan Motor
Inoperative
Fan motor defective
Replace.
Reservoir
Power on switch not ON
Position switch to ON.
level
indicator
Defective sending unit
Check or replace.
does not
operate
Reservoir empty
Fill.
Pump fails
Insufficient fluid supply (test
Fill Reservoir. Fill
to deliver
stand will shut down)
sufficient
volume
Air or suction line
Dirty, clogged low pressure
Replace elements
filter
III).
Pump volume control set too low
Adjust.
Pump fails
Low boost pump pressure (Unit
Check boost pump
to deliver
will shut down)
pressure.
sufficient
pressure
Clogged low pressure and high
Clean or replace
pressure filters
III).
Pump compensator not set
Reset (Refer to para.
properly
2-5).
High pressure relief valve set
Reset (Refer to para.
too low (dumping before compen-
2-5).
sator setting)
Defective pressure gage
Section II).
Noisy
Pump cavitating; insufficient
Check for adequate
Operation
fluid supply, low boost pres-
fluid supply; boost
sure, pump case not filled with
pressure, check fil-
fluid
ters; fill pump case
with fluid.
3-15