Power Pack Assembly; Assembly Of Time Delay Check Valve; Door Vent Valve Assembly; Main Relief Valve Assembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
6-71. ASSEMBLY OF POWER PACK.
a.
Use new "O" rings and gaskets during assembly.
b.
Lubricate all "O" rings with petrolatum per VV-P-236 or equivalent during assembly.
c.
Lubricate all threaded surfaces on the various valves in the Power Pack with MIL-G-7711 grease
or equivalent before installing
6-72. ASSEMBLY OF TIME DELAY CHECK VALVE. (Refer to Figure 6-13, item 59.)
a.
Install ball (63) into check valve body (65).
b.
Lubricate and install the "O" ring (61) in the seat (62).
c.
Install seat (62) into check valve body (65) and secure with snap ring (60).
d.
Lubricate threads, install "O" ring (66) on the valve body (65) and install the assembly into the
body (67). Torque to 45 inch-pounds.
6-73. ASSEMBLY OF DOOR VENT VALVE. (Refer to Figure 6-13, item 26.)
a.
Install the piston (32) into the vent valve body (33).
b.
Lubricate and install the "O" ring (31) on the retainer (30) screw retainer into the valve body
(33), tighten and secure with wire (105).
c.
Install stem (29), spring (28) and adjusting screw (27) into the retainer (30). Install adjusting
screw (27) flush.
d
Lubricate threads, install "O" ring (34) on the valve body (33) and install assembly into body
(67). Torque to 55 inch-pounds.
6-74. ASSEMBLY OF VENT FILTER. (Refer to Figure 6-13.)
a.
Install vent filter (42) into reservoir cover (36) and secure with snap ring (43).
6-75. ASSEMBLY OF STANDPIPE-FILTER. (Refer to Figure 6-13.)
a.
Install standpipe-filter (99) into body (67). Torque to 55 inch-pounds.
6-76. ASSEMBLY OF HAND PUMP CHECK VALVE. (Refer to Figure 6-13, item 88.)
a.
Install poppet (93), spring (94) and guide (95) into fitting (89) and secure with snap ring (96).
b.
Lubricate threads, install "O" ring (90), back up (91) and "0" ring (92) on the fitting (89) and
install assembly into body (67). Torque to 55 inch-pounds.
6-77. ASSEMBLY OF PRIORITY VALVE. (Refer to Figure 6-13, item 10.)
a.
Lubricate and install the "O" ring (18) and the back up (17) on the poppet (19) and insert the
poppet into the priority valve body (14).
b.
Lubricate "O" ring (21) and install into the body (67).
c.
Inspect the poppet seat (20) for a sharp seating edge. Lap as required to obtain a good, sharp
seating edge. Push the poppet seat into the valve body (14) and install assembly into body (67). Torque to
70 inch-pounds.
d.
Install button (13) and spring (12) and secure with adjusting screw (11). The adjusting screw
provides adjustment for the priority valve. Install flush at this time.
6-78. ASSEMBLY OF MAIN RELIEF VALVE. (Refer to Figure 6-13, item 1.)
a.
Inspect the poppet (6) and the poppet seat (7) for pitting or score marks. The two parts are
matched parts. If either or both are damaged, replace as an assembly only.
b.
Lubricate and install the "O" ring (9) and back up ring (8) on the poppet seat (7); insert the
poppet (6) into the seat (7) and install the assembly into the body (67).
c.
Lubricate threads and install relief valve body (5) into the body (67). Torque to 70 inch-pounds.
d.
Install button (4) and spring (3) into the relief valve body (5) and secure with adjusting screw (2).
The adjusting screw provides adjustment for the main relief valve. Install flush at this time.
Revised: 10/5/83
HYDRAULIC SYSTEM
2C2