Main Relief Valve Adjustment; Handle Release Adjustment (Wiebel Tool) - Piper Navajo Chieftain PA-31-350 Service Manual

1. STOP SCREW
2. INPUT SHAFT RETURN CAM
3. RETURN PLUNGER BALL
4. POWER PACK BODY
5. HANDLE RETURN CARTRIDGE
5
6. HANDLE
RETURN CARTRIDGE
7. RETURN PLUNGER BALL
8.
STOP PLUNGER
RETURN CAM IN HORIZONTAL
POSITION (NEUTRAL)
9. ARM
Figure 6-18. Handle Release Adjustment (Wiebel Tool)
c.
Rotate the input shaft to the neutral position, which will bring the input shaft return cam (2) to
the horizontal position.
d.
Hold the input shaft return cam (2) in the horizontal (neutral) position by inserting a .125 dia.
drill or punch through hold in the arm (9) and into rigging hole in body (4). Rigging hole is noted as hole
"A" in Figure 6-18. Adjust handle return cartridges (5 and 6) in such a manner that their return plunger
balls (3 and 7) touch the surface of the input shaft return cam (2) slightly.
CAUTION
Remove drill or punch from rigging hole "A".
e.
The detent must hold in both detent positions and must return with a positive snap when
manually released from either detent position.
6-88. ADJUSTMENT OF HAND PUMP RELIEF VALVE. (Refer to Figure 6-13, item 51.)
a.
With the input shaft in either the "gear up" or "gear down" position, apply hand pump pressure
very slowly until fluid flows from the hand pump relief valve.
CAUTION
It is important that the hand pump be operated slowly as pressure
is being increased to bleed the hand pump relief valve.
b.
Bleed air from the Power Pack by cracking the cap on the "door open" fitting.
c.
Adjust the adjusting screw (52) at the top of the valve until the valve cracks at the miximum
required pressure as given in Table VI-II, pumping slowly. Bleed pressure by cracking the cap on the "door
open" fitting after each adjustment.
6-89. ADJUSTMENT OF MAIN RELIEF VALVE. (Refer to Figure 6-13, item 1.)
a.
With the input shaft in the "gear up" or "gear down" position, apply pressure until fluid flows
from the main relief valve.
b.
Adjust the adjusting screw (2) at the top of the main relief valve until the valve cracks at the
required pressure given in Table VI-II. Bleed pressure after each adjustment by cracking the cap on the
"door open" fitting.
Reissued: 9/23/80
HYDRAULIC SYSTEM
NAVAJO CHIEFTAIN SERVICE MANUAL
2C7