Hydraulic Power Pack (Wiebel Tool); Power Pack Disassembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
6-55. HYDRAULIC POWER PACK (WIEBEL TOOL).
6-56. REMOVAL OF POWER PACK. (See Paragraph 6-21.)
6-57. DISASSEMBLY OF POWER PACK. (Refer to Figure 6-13.) After the Power Pack has been removed
from the airplane and all ports are capped or plugged, spray with cleaning solvent (Federal Specifications
P-S-661, or equivalent) to remove all accumulated dust or dirt. Dry with filtered compressed air. To
disassemble the unit, proceed as follows:
a. Remove wire (37), nut (35), reservoir cover (36) and "O" ring (47). Cover is a snug fit on
reservoir. Use a soft mallet and tap cover lightly to remove.
b.
Remove deflector plate (107) and snap ring (44) from center stud (41) and remove baffle plate (4)
from reservoir. Drain remaining hydraulic fluid from reservoir.
c. Remove the reservoir (46) and "O" ring (104). Reservoir is a snug fit in Body (67) and requires a
hard pull to disengage from Body.
d.
Remove center stud (41) and "O" ring (40).
NOTE
All electrical wires are color coded. Disregard color of wire
terminals. If colored wires are matched when wires are reinstalled.
the wires will be connected correctly.
e.
Remove screws (46), washers (45), switch assembly (44) and insulating plate (43). Switch will
remain hanging from the electrical wires. (Refer to Figure 6-14.)
f. Remove plastic strap (48) attaching the electrical wires to the door solenoid valve (11) and
remove the safety wire (47) from the door solenoid valve. (Refer to Figure 6-14.)
g.
Disconnect electrical wires of switch and door solenoid from terminal block (80).
h.
Remove four bolts (42) attaching the manifold assembly. Work the manifold assembly from the
Power Pack. taking care to prevent the loss of the transfer sleeves (36) between the manifold and the Power
Pack. (Refer to Figure 6-14.)
i.
Remove the five transfer sleeves (36) from the manifold (35). (Refer to Figure 6-14.)
NOTE
As the manifold is separated from the Power Pack body, the teeth
on the landing gear selector spool become disengaged from the
gear. This will permit the selector spool to move. DO NOT remove
the selector spool from its position. Never move it to a position
that is more than flush ( .06 inch) with the manifold body at the
end opposite the selector spool teeth. If moved beyond this
position, an "O" ring will become caught and the selector spool
will then be difficult to remove.
Revised: 10/5/83
HYDRAULIC SYSTEM
2B19