Piper Navajo PA-31 Service Manual page 378

Selector lever
out of adjust-
ment.
Selector lever
(Note: Selector
lever cannot be
moved to gear
up while left
main gear strut
is compressed
or with elec-
trical power
off.)
Hydraulic fluid
reservoir below
operating level.
Leak or obstruc-
tion in hydraulic
lines.
Internal leakage
in main re-
lief valve.
Internal leadage
in hand pump
relief valve.
PIPER NAVAJO SERVICE MANUAL
TABLE VI-IV. TROUBLESHOOTING, HYDRAULIC SYSTEM
Trouble
Cause
Remedy
Landing gear
system fails
to operate.
Selector lever
disconnected.
Connect lever.
Adjust lever.
Adjust lever.
Refer to paragraph 6-162.
Then fill the power pack
with hydraulic fluid.
Refer to paragraph 6-162.
Then check the system
with hydraulic test unit
or hand pump.
Check system opera-
tion per paragraph
6-1 3.
Check system opera-
tion per paragraph
6-14.
Gear operates
abnormally slow
or partially.
Low fluid level.
Leaking or
kinked line.
Refer to paragraph 6-162.
Then fill power pack
with hydraulic fluid.
Refer to paragraph 6-162.
Then replace line.
Internal leak
in cylinder.
Repair or replace
cylinder.
HYDRAULIC SYSTEM
Reissued: 10/12/79
2D24