Piper Navajo PA-31 Service Manual page 349

PIPER NAVAJO SERVICE MANUAL
d. Operate the test hand pump to raise the pressure in the reservoir until the pressure gauge
indicates 50 PSI maximum.
e.
Check for leaks, there should be no external leakage.
f.
Crack the vent fitting to release the pressure, remove the test equipment, drain the reservoir
and
cap the fittings.
g.
The hydraulic Power Pack is now ready to be installed in the airplane.
6-95. INSTALLATION OF POWER PACK. (See Paragraph 6-54.)
6-96. LANDING GEAR SELECTOR HANDLE MECHANISM.
NOTE
Instructions contained in Paragraphs 6-98 through 6-101 apply to
airplanes with serial numbers 31-5 through 31-511. Instructions
contained in Paragraphs 6-102 through 6-105 apply to airplanes
with serial numbers 31-512 and up.
6-97. OPERATION OF GEAR SELECTOR HANDLE MECHANISM. The operation of the
landing gear
selector handle must give the feel of having made a positive engagement with a detent. With
the selector
handle in the up or down position and in a detent, a force of 3-1/2 to 6 pounds applied
perpendicular to
the centerline of the handle at the centerline of the knob will be required to move the handle
from the
detent and return it to the neutral position. To check the operation of the gear selector handle
mechanism,
place the airplane on jacks (refer to Jacking, Section II) and operate the landing gear selector
handle
through its entire travel, both up and down.
6-98. REMOVAL OF GEAR SELECTOR HANDLE MECHANISM. (Refer to Figure 6-24.) The
removal
of the gear selector handle mechanism can be divided into four individual assemblies: The
Solenoid
Assembly, the Selector Handle Assembly, the Torque Tube Assembly, and the Long Link Assembly.
(Refer
to Figure 6-24.)
a. Removal of Solenoid Assembly:
1. Remove the wire from the solenoid at the rear of the selector handle.
2. Remove the two locknuts and strap holding the solenoid to the selector handle assembly
and remove the solenoid.
b.
Removal of Selector Handle Assembly:
1. Remove the stop pin (3) and pull the control knob (1) and sleeve (2) from the lever
assembly.
2.
Remove the screw holding the gear selector placard and remove the three remaining screws
holding the selector assembly (5) to the instrument panel.
3. Remove the wires from the rear of the selector assembly (5) and mark them for ease of
installation.
4. Remove the cotter pin, washer and clevis pin from the short link (7) to the torque tube arm
(8).
5. Remove the selector assembly (5) from the instrument panel.
c. Removal of Torque Tube Assembly:
1. Remove the cotter pin, washer, and clevis pin from the short link (7) clevis and torque tube
arm (8).
2. Remove the cotter pin, washer and clevis pin from the long link (11) clevis and arm at the
right end of the torque tube assembly.
Reissued: 10/12/79
HYDRAULIC SYSTEM
2C19