Piper Cherokee SIX 300 Service Manual page 236

PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
TABLE VA-IV. HYDRAULIC SYSTEM TROUBLESHOOTING (cont.)
Trouble
Landing gear retraction
system fails to operate. (cont.)
Landing gear extension
system fails to operate.
NOTE: If the extension solenoid of the pump can be heard to actuate when operating the gear
selector switch, it may be assumed that the gear control circuit is operating properly and the
actuator circuit should be further checked.
VA - HYDRAULIC SYSTEM
Cause
Pressure head air
passage obstructed. *
Pressure head hose off. *
Split or hole in diaphragm
of auxiliary extender. *
* Can be checked by using override.
Landing gear actuator
circuit breaker open.
Landing gear selector
circuit breaker open.
Landing gear actuator
circuit wires broken.
Landing gear selector
circuit wires broken.
Pump extension solenoid
inoperative (outboard
solenoid).
Gear selector switch
ground incomplete.
Gear selector switch
inoperative.
Hydraulic pump ground
incomplete.
Hydraulic pump in
operative.
Hydraulic fluid in
reservoir below
operating level.
Low or dead battery.
1K8
Remedy
Clear obstruction
Reconnect hose.
See latest revision of
Piper Service Letter
No. 810.
Reset circuit breaker
and determine cause
for open circuit breaker.
Reset circuit breaker
and determine cause
for open circuit breaker.
Check wiring.
Check wiring.
Replace solenoid.
Check ground.
Replace switch.
Check ground.
Replace or overhaul
pump.
Fill reservoir with
hydraulic fluid.
Check condition of
battery.
07/15/06