Pump Fails To Shut Off Though The Gear Has Fully Extended - Piper PA-44-180 SEMINOLE Maintenance Manual

CHART 2902. TROUBLESHOOTING HYDRAULIC SYSTEM (cont.)
Trouble
Pump fails to shut off though
gear has fully retracted. (cont.)
Pump fails to shut off though the
gear has fully extended.
The out of adjustment or failed switch may be determined by
noting which down light is not lit.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Internal leakage of system.
External leakage of system.
Pump relief valve out of
a d j u s tment.
Pump extension lower s o l e n o i d
sticking.
Nose gear down limit switch
actuator out of adjustment.
Nose gear down limit switch
failed.
Main gear down limit switch out
of adjustment.
Main gear down limit switch
failed.
— NOTE —
2C4
Remedy
Check free fall valve for internal
leakage.
Check gear actuating cylinders
for internal leakage.
(2) Check for internal damage to
hydraulic pump.
Check free fall valve for external
leakage.
Check gear actuating cylinders
for external leakage.
Check for broken or damaged
hydraulic lines or hoses.
Replace pump.
(2) P restolite pumps
Return Oildyne pumps to Piper
A i r c r a f t v i a l o c a l P i p e r
d i s t r i b utor for overhaul.
Replace solenoid.
Adjust switch actuator. (Refer
to Adjustment of Nose Gear
Down Limit Switch.)
Replace switch.
Adjust switch. (Refer
Adjustment of Main Gear Down
Limit Switch.)
Replace switch.
Page 29-09
Revised: June 20, 1995
only.
to
29-02-00