Piper Navajo PA-31 Service Manual page 329

PIPER NAVAJO SERVICE MANUAL
k. Lubricate and install the two "O" rings on the landing gear handle release plunger and insert the
plunger in the body.
1.
Lubricate the landing gear handle release spring, guide, retainer and nut and install in the body.
Tighten the retainer (adjusting plug) until approximately .312 inch of thread is engaged.
m.
Install the gear and rack protective cover. Safety the attaching screws.
6-44. INSTALLATION
AND ADJUSTMENT OF INBOARD GEAR DOORS SOLENOID VALVE
SWITCH. (Refer to Figure 6-12.)
a. Install the landing gear up-down switch and the switch attaching bracket. Note that the washers
are used between the bracket and Power Pack. The switch bracket has slotted holes for switch adjustment.
b. Adjust the top edge of the bracket (50) to be flush with the edge of the manifold assembly.
Tighten the screws securely and safety wire them.
c. Adjust the switch to the full up position in the slot provided.
d.
Move the selector spool to the gear up position and check that the switch retraction arm does not
bottom on the switch body.
e.
Move the selector spool to the gear up and gear down position to ensure switch actuates on and
off.
f.
If removed, install the terminal strip and place the capacitor along side the strip. Connect
electrical wires to the terminal strip and ground, clamp wires to the door solenoid valve.
NOTE
Electrical wires are coded with color stripes. Disregard the color of
wire terminals or plastic sleeving. If the color codes are matched
when the wires are installed, the wires will be connected correctly.
g. Continue reassembly of the Power Pack after pressure adjustments have been completed.
6-45. 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 (MIL-H-5606).
b.
Minimum equipment needed is as follows:
1. Test unit pump or hand pump with a capacity of over 2100 psi.
2. One hydraulic pressure gauge with a capacity of over 2100 psi.
3. One hydraulic pressure gauge of 150 psi capacity.
c.
Connect the test pressure hose to the pressure inlet port of the Power Pack. The higher pressure
gauge is to operate off of 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 Power Pack.
f.
Cap all other fittings with high pressure caps.
NOTE
For 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 door hydraulic circuits.
Reissued: 10/12/79
HYDRAULIC SYSTEM
Effectivity
2B23
OZONE