TM 55-4920-384-13&P
Table 3-2. Troubleshooting (Con't)
Probable Cause
Possible Remedy
Engine cold causing poor combustion
Allow sufficient time for engine warm up before
operating the hydraulic system.
Fuel Consumption excessive.
Choke control partially closed
Open choke control.
Dirty air cleaner
Service air cleaner.
Fuel leaks
Report to AVIM.
Defective Alternator, report to AVIM.
Battery needs frequent recharging.
Battery electrolyte level low
Add battery water to correct level.
Battery defective
Replace defective battery.
Hydraulic pump fails to deliver sufficient
pressure
High pressure relief valve out of
Adjust the high pressure valve.
adjustment.
Adjust the compensator control.
Compensator control incorrectly adjusted
Fluid by-pass valve open
Close the fluid by-pass valve.
Defective fluid pressure gage
Report to AVIM.
Fill prime port of pump.
Loss of prime
Hydraulic pump fails to deliver sufficient
volume.
Fluid volume control incorrectly adjusted
Adjust the fluid control.
Engine speed incorrect
Check throttle for pre-set stare position.
Bleed air from hydraulic system.
Air in hydraulic system
Hydraulic system pressure too high.
Adjust high pressure relief valve.
High pressure relief valve set too high
High pressure relief valve defective
Refer the malfunction to AVIM.
Hydraulic fluid temperature too high.
Allow fluid to cool.
Low pressure filter dirty
Report deficiency to AVIM.
Replace gage.
Defective temperature gage
Fill reservoir to correct level.
Reservoir fluid level low
Adjust or replace thermoswitch.
Defective thermoswitch
Adjust relief valve setting to a valve
Compensator pressure setting higher
of 150 to 200 psi higher than the compensator
than relief valve pressure setting
setting.
3-6
