Piper Navajo PA-31 Service Manual page 332

PIPER NAVAJO SERVICE MANUAL
6-49. ADJUSTMENT OF PRIORITY VALVE.
a.
Place the landing gear handle in the up position and remove the cap from the gear up fitting.
b.
Apply pressure and note the priority valve cracking pressure by observing the pressure gauge
when fluid first starts to flow from the gear-up port.
c. Adjust the priority valve to crack at the pressure stated in Table VI-I. Bleed pressure after each
adjustment by cracking the cap on the door-open fitting.
d. Disconnect the test unit and cap all open fittings.
6-50. ADJUSTMENT OF DOOR SOLENOID VALVE.
a. Remove the caps from the door-open and door-close fittings on Power Pack.
b. Connect a test harness to the electrical plug of the Power Pack and power source. (A test harness
may be fabricated as shown in Figure 6-35.)
c.
With the test harness switch in the OFF position, and the landing gear handle in either the up 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 down position, the landing gear handle in
either the up or down neutral position, apply pressure and note that fluid flows from the door-close fitting.
e. Disconnect the test equipment and cap all open fittings.
6-51. TESTING DOOR VENT VALVE.
a.
Remove the cap from the door-open fitting on the Power Pack, and attach the pressure hose from
the hand pump with the 150 psi pressure gauge to the door-open fitting.
b. Check for fluid seepage while slowly applying the stated pressure in Table VI-I.
c. Check to see that the door vent valve shuts off fluid flow when the pressure stated in Table VI-I
is applied. (Slow decrease in pressure from the valve leakage is normal.)
d.
Relieve pressure by cracking the hose fitting from the hand pump.
e.
Disconnect the test unit and cap all open fittings.
6-52. ASSEMBLY OF POWER PACK. (Refer to Figure 6-10 or 6-11.) To complete the reassembly of the
Power Pack, proceed as follows:
a. Install the reservoir cover attaching center stud (21). Install with the longer threaded end down,
and screw in until the stud bottoms in the reservoir.
b. Install the plate (82) and spacer (85) of the center stud. Safety wire the main relief valve locknut
(2) to the screened standpipe (69).
c.
Lubricate and install the "O" ring (86) in the groove of the reservoir cover.
d. Position the cover (57) on the reservoir, aligning the index marks on the reservoir and cover.
CAUTION
Be sure that the large "O" ring is positioned properly in the groove
of the reservoir cover and that the "O" ring is not pinched as the
cover is installed.
e.
Lubricate and install the "O" ring of the cover (88) at the top of the cover and around the center
stud (21).
f. Install the cover retaining nut (87) (cap nut), tighten and safety.
Reissued: 10/12/79
HYDRAULIC SYSTEM
Effectivity
2
OZONE
2C2