TM 55-4920-384-13&P
Hydraulic pump fails to deliver
sufficient volume.
Fluid volume control defective
Repair fluid volume control.
Bleed air from the system.
Air in the hydraulic system
Engine speed too low
Check engine with hand speed indicator.
Replace tachmoeter if defective.
Replace or repair fluid flow
Fluid flow indicator defective
indicator.
Replace high pressure filter.
High pressure filter clogged
Replace fluid by-pass valve,
Fluid by-pass valve leaking
Hydraulic system pressure
too high.
High pressure relief valve
Repair or replace high
pressure relief valve.
defective
Compensator control defective
Repair or replace compensator
control.
Fluid pressure gage defective
Repair or replace fluid pressure
gage.
Hydraulic Fluid Temperature
too high.
Fluid temperature gage defective
Replace fluid temperature gage.
Filter pressure filter clogged
Replace high pressure filter.
Thermoswitch defective
Adjust or replace the thermoswitch.
Compensator pressure switch set
Adjust relief valve to a setting
150 to 200 psi higher than
higher than relief valve pressure setting
compensator setting.
4-9
