Piper Navajo PA-31 Service Manual page 321

PIPER NAVAJO SERVICE MANUAL
h. Remove time-delay valve ball, spring, spacer, and spring by removing time-delay retainer.
NOTE
Do not remove the time-delay plunger until after the manifold
assembly has been removed.
i. Cut the safety wire and remove the screws attaching the gear and rack protective cover. Remove
the cover.
j.
Remove the clamp attaching the electrical wires to the door solenoid valve and remove the safety
wire from the door solenoid valve.
k. Cut the safety wire and remove the four screws attaching the manifold assembly. Work the
manifold assembly from the Power Pack, taking care to prevent loss of transfer tubes between the manifold
and Power Pack.
1. Remove the seven transfer tubes from the manifold or Power Pack.
CAUTION
As the manifold is separated from the Power Pack body, the rack
on the landing gear selector spool becomes 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 with the manifold body at the end
opposite the selector spool rack. If moved beyond this position, an
"O" ring will become caught and the selector spool will then be
extremely difficult to remove.
6-23. DISASSEMBLY OF MANIFOLD. (Refer to Figure 6-12.)
a. Cut the safety wire (35) and remove the door solenoid (16) by unscrewing from the manifold
(29). This solenoid is hand tightened. Use a strap wrench or strip of sandpaper to grip the door solenoid for
removal. Remove the plunger return spring (18).
b.
Remove the plunger retainer pin (19) and then remove the plunger (20) from the spool (8) by
carefully pulling from the manifold.
c. Using a hook formed from a brass welding rod, withdraw the transfer sleeve from the manifold,
by inserting the hook into the oil hole in the transfer sleeve (5).
NOTE
Be sure that the end of the hook is not over .062 inch long, and
use the hook with care to prevent scratching the bore in the
manifold. The sleeve will be hard to withdraw due to "O" ring
friction.
d. Remove the plunger (3) of the time-delay valve, using a small wooden dowel inserted in the
center of the plunger. The plunger should slide out of the manifold easily.
e. On OAS 2930-1 Power Packs only remove the screws (13), bracket (36), bushing (12), spring
( 11), stop (10) and screw assembly (9) from the back of the landing gear selector spool (31).
f.
Remove the landing gear selector spool (31) by grasping the rack end of the spool and carefully
pulling it from the manifold.
Reissued: 10/12/79
HYDRAULIC SYSTEM
Effectivity
5
OZONE 2B15