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Section V: TROUBLESHOOTING
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TM-55-4920-335-14 Hydraulic Test Stand Type D-5B P/N 674016 Manual
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Appendix A: ILLUSTRATED PARTS BREAKDOWN
TM 55-4920-335-14
TABLE VI. Troubleshooting (Cont)
Trouble
Probable Cause
Remedy
Restricted flow in inlet line.
Clean inlet strainer. Remove water and sludge from fuel tank.
Low engine fuel
pressure.
Defective fuel pump.
Replace fuel pump.
Loose fuel line connections.
Tighten all connections between tank and pump.
Defective carburetor.
Replace carburetor.
Excessive fuel
consumption.
Fuel leaks.
Check tank, lines and all fittings.
Dirty air cleaner.
Clean mesh air cleaner element.
Choke partially closed.
Open choke.
Faulty regulator.
Replace regulator.
Battery needs
frequent recharging.
Electrolyte level not maintained.
Keep correct level by daily inspection.
Generator output inadequate.
Check generator for specified output, replace if necessary.
Loose or broken fan belt.
Adjust belt tension or replace belt.
Pump not primed.
Failure of hydraulic
Open line from compensator shutoff valve to compensator on pump.
pump.
Open compensator shut-off valve and operate pump until oil is free of air.
Stop engine, reconnect lines.
Pump cannot be bled.
Replace clogged filter element.
Sheared drive shaft on pump.
Replace pump.
Shaft seal leakage of pump.
Remove pump for overhaul.
Refill hydraulic reservoir.
Seizure due to inadequate oil
supply.
High pressure relief
Control cone not seating
Remove control knob seal piston, compression spring and cone. Inspect
valve chattering.
properly. Foreign material
cone for defects, replace if necessary. If trouble persists, remove valve
for overhaul.
lodged between control cone and
seat.
Valve improperly adjusted.
Adjust valve to proper setting for specific aircraft system.
Relief valve spool remaining
Remove valve for overhaul.
inoperative.
5-2

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