Piper Navajo PA-31 Service Manual page 379

Selector lever and/or
connecting mechanism out
of adjustment.
If gear completes
cycle (red light out)
but doors do not
close, battery output
may be low.
Time delay valve and/
or piston release lock
out of adjustment.
Time delay valve air
locked.
Adjust control.
Check voltage.
Check operation per
paragraphs 6-10 and
6-11.
Bleed air out by
holding selector down
for 30 seconds, then
make three or four
rapid movements to
neutral and back to
down.
HYDRAULIC SYSTEM
PIPER NAVAJO SERVICE MANUAL
TABLE VI-IV. TROUBLESHOOTING, HYDRAULIC SYSTEM (cont.)
Trouble
Cause
Remedy
Gear operates
abnormally slow
or partially.
(cont.)
Priority valve
out of adjustment
or leaking.
Slow leak in
main relief
valve. (Engine
pump.)
Check valve opera-
tion per paragraph
6-12.
Check system opera-
tion per paragraph
6-13.
Slow leak in
hand pump
relief valve.
External leakage
at selector
valve.
One engine pump
inoperative.
Check system opera-
tion per paragraph
6-14.
Refer to paragraph 6-162.
Then replace damaged
"O" rings.
Refer to paragraph 6-155
before replacing pump.
Selector handle
returns to neu-
tral before cycle
is complete.
Cable, line or obstruction
restricting the travel
required to fully select
gear up or down.
Check and remove
obstruction.
Reissued: 10/12/79
2E1