Piper Navajo PA-31 Service Manual page 380

PIPER NAVAJO SERVICE MANUAL
TABLE VI-IV. TROUBLESHOOTING, HYDRAULIC SYSTEM (cont.)
Trouble
Cause
Remedy
Gear retracts or
extends before
doors open.
Priority valve leaks
in power pack.
Solenoid valve
stuck in closed
position.
Check valve
cracking pressure.
Turn off power
and hand pump
doors open. (Note
With power off
solenoid valve
shuttles to door
open and the doors
may be opened with-
out selecting gear
up or down.)
Micro switch on
power pack out of
adjustment.
Check for loose wire
or mounting, or bent
bracket.
Doors come open
in flight.
NOTE
Refer to Landing Gear
Troubleshooting Chart,
Table VII-I.
Doors fail to
close.
Improper rigging of door
actuator.
Malfunction of actuator lock
mechanism.
Faulty limit
switch.
Check for proper rigging.
Check actuator operation.
Check all indicator
lights.
Low electric
power supply.
Check battery.
HYDRAULIC SYSTEM
Revised: 10/12/83
2E2