Piper Navajo Service Manual - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
6-105. ADJUSTMENT OF LANDING GEAR SELECTOR HANDLE. (Refer to Figure 6-25.)
a. Ascertain that the selector arm on the lever assembly is safety wired as shown in Figure 6-25.
b. Depress the button on the solenoid lock to allow the handle to travel freely between the two
neutral positions.
c. To check the handle-release mechanism, disconnect the control cable from the arm at the Power
Pack. Connect a spring scale to the arm and pull both fore and aft, perpendicular to the centerline of the
arm to determine that it will leave the detent at a force of 9 + 1-2 pounds. If it does not release at the
required force, adjust the mechanism in accordance with instructions given in Paragraph 6-46 for Ozone
units or Paragraph 6-87 for Wiebel Tool units.
d. Position the control arm on the power pack in neutral. Refer to paragraph 6-87 for method of
holding the control arm in the neutral rigging position. Position and hold the selector handle in the down
neutral rigging by inserting a .125 drill or punch through the rigging hole in body and into hole in selector
handle. Rigging hole for selector handle is noted as hole "A" in Figure 6-25.
e. Connect the terminal ends of the cable assembly to the Power Pack Control arm and the selector
handle.
f. The terminal ends can be adjusted to obtain the neutral position in both the control arm and
selector handle.
g. Recheck that the handle will leave the detent at 3-1/2 to 6 pounds.
6-106. FILLING HYDRAULIC RESERVOIR. (Refer to Section II, Servicing Hydraulic Reservoir.)
6-107. BLEEDING THE HYDRAULIC SYSTEM.
a. Jack the airplane as described in Section II.
b.
Ascertain that the reservoir is full.
c. Connect a hydraulic test unit to the airplane as described in Paragraph 6-8.
d. Cycle the landing gear system through several cycles.
e. Check that hydraulic reservoir is full.
f.
Disconnect the hydraulic test unit as described in Paragraph 6-17.
g.
Ascertain that the landing gear selector handle is in the down neutral position, and that the
landing gear is down and locked.
h. Remove the airplane from jacks.
6-108. HAND PUMP (EMERGENCY) (OZONE).
6-109. REMOVAL OF HAND PUMP.
a. Remove the pump access panel located aft of the control pedestal.
b.
Disconnect the hydraulic pressure and suction lines from the forward end of the pump.
c.
Remove the pump from its mounting bracket by removing attachment bolts.
d. Remove the pump from the airplane.
e. Cover the pressure and suction lines to prevent contamination.
6-110. DISASSEMBLY OF HAND PUMP. (Refer to Figure 6-26.)
a.
To remove the plunger (13) and component parts, remove pin (22) and Allen screws (19)
allowing the bracket (18) to separate from the pump body (6).
b.
Pull the plunger assembly from the pump body.
c. Slide the scraper (17) and packing gland (15) from the plunger (13).
d. To remove the check ball assembly from the plunger, remove the snap ring (7) in the end of the
plunger and with a low charge of air injected into the hole in the side of the plunger, blow the check ball
(10) and seat (9) from the plunger. Remove the spring (11).
Reissued: 10/12/79
HYDRAULIC SYSTEM
2D1