Operating instructions

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 (fig. 1-6)
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) System (para. 2-4).
sufficient
volume Air or suction line Bleed (para. 2-4).
Dirty, clogged low pressure Replace elements
filter (Chapter 3, Section
III).
Pump volume control set too low Adjust.
(Refer to para. 2-6)
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 (Chapter 3, Section
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 Check gage (Chapter 3,
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