Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
07/15/06 VA - HYDRAULIC SYSTEM
1K9
TABLE VA-IV. HYDRAULIC SYSTEM TROUBLESHOOTING (cont.)
Trouble Cause Remedy
Landing gear retraction Hydraulic fluid in reservoir Fill reservoir with
extremely slow. below operating level. hydraulic fluid.
Restriction in hydraulic Isolate and check
lines. hydraulic lines.
Shuttle valve sticking Check cause.
in pump base.
Pump stops during gear Landing gear actuator Reset circuit breaker
retraction. circuit breaker opens. and determine cause
for overload.
Landing gear selector Reset circuit breaker
circuit breaker opens. and determine cause
for overload.
Pressure switch out of Remove and readjust or
adjustment. replace switch.
Mechanical restriction Place airplane on jacks
or obstruction in hydraulic and run retraction
system to allow pressure check. Isolate and
to build up and shut off determine cause.
pump before gear has
retracted.
Shuttle valve sticking in Check cause.
pump base.
Pump stops during gear Landing gear actuator Reset circuit breaker
extension. circuit breaker opens. and determine cause
for overload.
Landing gear selector Reset circuit breaker
circuit breaker opens. and determine cause
for overload.
Pump fails to shut off Pressure switch inoperative. Replace switch.
though gear has fully
retracted.
Pressure switch out of Replace switch.
adjustment.
Pump retraction solenoid Replace solenoid.
sticking (inboard solenoid).