Piper Arrow IV Turbo Maintenance Manual page 332

CHART 2901. HYDRAULIC SYSTEM TROUBLESHOOTING (cont.)
Trouble
Pump fails to shut off
though gear has fully
retracted. (cont.)
Pump fails to shut off
though the gear has fully
extended.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Cause
Internal leakage of system.
External leakage of system.
Pump relief valve out of
adjustment.
Pump extension solenoid
sticking (outboard sole-
noid).
Nose gear down limit switch
actuator out of adjustment.
Nose gear down limit switch
failed.
2C5
Remedy
Check back-up extension
unit valve for internal
leakage.
Check gear actuating
cylinders for internal leakage.
Check for internal damage
to hydraulic pump.
Check back-up extension
unit valve for external
leakage.
Check gear actuating
cylinders for external
leakage.
Check for broken or
damaged hydraulic lines
or hoses.
Replace pump.
Replace solenoid.
Adjust switch actuator.
(Refer to Adjustment of
Nose Gear Down Limit
Switch, Chapter 32.)
Replace switch.
29-00-02
Page 29-11
December 1, 1978