Troubleshooting Chart (Hydraulic System) - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VI-IV. TROUBLESHOOTING CHART (HYDRAULIC SYSTEM)
Trouble Cause Remed
Troube ly
Landing gear system
fails to operate.
Selector lever dis-
connected.
Connect lever.
Selector lever out
of adjustment.
Selector lever
jammed. (Note: Se-
lector lever can-
not be moved to
gear up while left
main gear strut is
compressed or with
power off.)
Hydraulic fluid in
reservoir below
operating level.
Leak or obstruction
in hydraulic lines.
Internal leakage in
main relief valve.
Internal leakage in
hand pump relief
valve.
Adjust lever.
Adjust lever.
Refer to paragraph 6-158.
Then fill the power pack
with hydraulic fluid.
Refer to paragraph 6-158.
Then check the system
with hydraulic test unit
or hand pump.
Check system opera-
tion per paragraph
6-13.
Check system operation
per paragraph 6-14.
Gear operates abnor-
mally slow or
partially.
Low fluid level.
Refer to paragraph 6-158.
Then fill power pack with
hydraulic fluid.
Leaking or kinked
line.
Internal leak in
cylinder.
Priority valve out
of adjustment or
leaking.
Refer to paragraph 6-158.
Then replace line.
Repair or replace
cylinder.
Check valve operation
per paragraph 6-12.
HYDRAULIC SYSTEM
Reissued: 9/23/80
2Dll