Piper Navajo PA-31 Service Manual page 346

6-85. INSTALLATION AND ADJUSTMENT OF INBOARD GEAR DOORS SWITCH. (Refer to Figure
6-19.)
a.
Install switch assembly (44) with insulating plate (43) between switch and manifold (35) and
secure with washers (45) and screws (46). Tighten screws lightly.
b.
Move the selector spool to the gear up and down position a couple of times to insure proper
actuating of switch from "on" to "off." Torque switch screws to 20 inch-pounds.
c.
Safety wire solenoid (12) to bracket (74) (see Figure 6-18) using safety wire (47).
d.
Connect the electrical wires from switch to the terminal block (80) (see Figure 6-18) and secure
to solenoid (12) using plastic strap (48).
NOTE
Electrical wires are color coded. Disregard the color of the wire
terminals. If the colors are matched when installing the wires, the
wires will be connected correctly.
e. (Refer to Figure 6-18.) Install plungers (85), springs (84) and button (83) into the handle-release
bodies (86) and retain with snap rings (82).
f. (Refer to Figure 6-18.) Install the handle-release assemblies (81) in the body (67). Install
assemblies loose, they will be adjusted later.
6-86. POWER PACK BENCH TEST ADJUSTMENT. After completion of the overhaul, the Power
Pack
may be bench tested prior to installation in the airplane using a hydraulic test unit or similar test
equipment. This procedure requires a minimum of test equipment for testing the Power Pack.
a. Use only clean hydraulic fluid per MIL-H-5606.
b.
Minimum equipment needed is as follows:
1. Test unit pump and hand pump with a 2500 PSI capacity.
2. One hydraulic pressure gauge of 2500 PSI capacity.
3.
One hydraulic pressure gauge of 200 PSI capacity.
c.
Connect the test pressure hose to the pressure inlet port of the Power Pack. The 2500 PSI gauge
is to operate off the pressure line.
d.
Connect the suction hose to the suction port of the Power Pack.
e. If a vent hose is part of the test unit, connect it to the vent port at the top of the reservoir cover Do
not plug vent port.
f.
Cap all other fittings with high pressure caps.
NOTE
For the control of the door valve solenoid, it will be necessary to
fabricate an electric harness as shown in Figure 6-35. This harness,
when connected to a 24-volt battery will allow control of the
electrical current to the door valve solenoid, permitting operation
of the hydraulic door circuits.
6-87. ADJUSTMENT OF HANDLE-RELEASE MECHANISM. (Refer to Figure 6-23.) The following
procedure outlines the adjustments to set the handle-release cartridges and stops in the correct position
before installing the Power Pack into the airplane.
a. Rotate the input shaft into the "gear up" detent position and adjust stop screw (1) to allow a
slight overtravel past the detent position.
b. Rotate the input shaft into the "gear down" detent position and adjust stop screw (8) to allow a
slight overtravel past the detent position.
Revised: 10/12/83
HYDRAULIC SYSTEM
Effectivity
2C16
WIEBEL
PIPER NAVAJO SERVICE MANUAL