Piper ARROW III, Service Manual

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TABLE VI-III. HYDRAULIC SYSTEM TROUBLESHOOTING (cont)
Pump running inter- § Check for broken or
mittently after gear damaged hydraulic
has retracted. (cont) lines.
Gear stops part way up, § Pump high pressure § Replace pump.
but pump continues to relief valve out of
run. adjustment.
§ Internal leakage of * Check back-up extension
system. unit valve for internal
leakage.
§ Check gear actuating
cylinders for internal
leakage.
§ Check for broken or
damaged hydraulic
lines.
§ Hydraulic fluid in § Fill reservoir with
reservoir below hydraulic fluid.
operating level.
All gears fail to * Back-up extension unit * Check unit and valve
free fall. valve fails to open. and replace.
§ Back-up free fall § Check valve and
valve fails to open. replace.
* Gear free falls at * Back-up extender unit * Check extender unit
air speeds above hydraulic valve fails spring adjustment.
that required. to close.
* Check hydraulic valve
for sticking open.
* Check extender unit
diaphragm for damage.
* Check for restriction in air
pressure and static lines.
* Applies only to airplanes that are in compliance with Part II of Service Bulletin 866A and the back-up
gear extension system is operational.
§ Applies to all airplanes.
Trouble Cause Remedy
Revised: 2/13/89
CHEROKEE ARROW III SERVICE MANUAL
HYDRAULIC SYSTEM