Priority Valve Adjustment; Door Solenoid Valve Adjustment; Adjustment Of Door Vent Valve; Reservoir Leakage Test - Piper Navajo Chieftain PA-31-350 Service Manual

6-90. ADJUSTMENT OF PRIORITY VALVE. (Refer to Figure 6-13, item 10.)
a. Place the input shaft in the "gear up" position and remove cap from the "gear up" fitting.
b. Apply pressure and note and priority valve cracking pressure by observing the pressure gauge
when fluid first starts to flow from the "Gear up" port.
c. Adjust the adjusting screw (11) until the valve cracks at the required pressure given in Table
VI-II. Bleed pressure after each adjustment by cracking cap on "door open" fitting.
d. Disconnect the test unit and cap all open fittings.
6-91. ADJUSTMENT OF DOOR SOLENOID VALVE. (Refer to Figure 6-14, item 11.)
a. Remove the caps from the "door open" and "door closed" fittings on Power Pack.
b. Connect a test harness to the electrical plug of the Power Pack and to power source. (Test harness
may be fabricated as shown in Figure 6-29.)
c. With the test harness switch in the "OFF" position and the input shaft in either the "up neutral"
or "down neutral" position, apply pressure and note that fluid flows from the "door open" fitting.
d. With the test harness switch in either the "gear up" or "gear down" position, the input shaft in
either the ' up neutral" or "down neutral" position, apply pressure and note that fluid flows from the
"door closed" fitting.
e. Disconnect the test equipment and cap all open fittings.
6-92. ADJUSTMENT OF DOOR VENT VALVE. (Refer to Figure 6-13, item 26.)
a. Remove the cap from the "door open" fitting on the Power Pack and attach the pressure hose
from the hand pump with the 200 PSI pressure gauge to the "door open" fitting.
b. Slowly apply pressure to see that fluid seeps from the door vent valve.
c. Adjust the adjusting screw (27) so that fluid flows from the vent valve from 0 to 100 PSI (See
Table VII-II.)
d. Increase pressure to 150 PSI max. and check to see that the door vent valve is shut off. If
pressure falls below 100 PSI, fluid must resume flowing from door vent valve (also see Table VI-II).
e. Relieve pressure by cracking the hose fitting from the hand pump.
f. Disconnect the test unit and cap all open fittings.
6-93. ASSEMBLY OF POWER PACK. (Refer to Figure 6-13.) To complete the reassembly of the Power
Pack, proceed as follows:
a. Install the reservoir cover (36) on the reservoir (46) and secure with nut (35) and safety wire nut
(35) to reservoir cover (36) by using safety wire (37). Torque nut (35) to 35 inch-pounds.
NOTE
When positioning reservoir cover (36) make sure that the vent
fitting (39) points to the left when Power Pack is installed in the
airplane. Also when installing reservoir cover (36), be sure large
"O" ring (47) is not being pinched.
6-94. TESTING RESERVOIR FOR LEAKAGE. (Refer to Figure 6-13.)
a. Remove the drain fitting (100) as applicable, and attach hand pump with 200 PSI gauge to the
drain port.
b. Remove the cap from the reservoir vent fitting (39) at the top of the reservoir and operate the
hand pump until the reservoir is completely full, as indicated by fluid coming out of vent fitting (39).
c. Cap the reservoir vent fitting (39).
Reissued: 9/23/80 HYDRAULIC SYSTEM
2C8
NAVAJO CHIEFTAIN SERVICE MANUAL