Piper Navajo PA-31 Service Manual page 338

PIPER NAVAJO SERVICE MANUAL
6-58. DISASSEMBLY OF MANIFOLD. (Refer to Figure 6-19.)
a.
Remove the door solenoid (12) by unscrewing it from the manifold (35). Use proper wrench.
Remove the plunger return spring (14).
b. Remove the pin (16), and then remove the plunger (15) from the spool (10) by carefully pulling
it from the manifold.
c. Using a hook formed from a brass welding rod, withdraw the transfer valve sleeve (7) from the
manifold, by inserting the hook into one of the oil holes in the transfer valve sleeve.
NOTE
Be sure that the end of the hook is not over .06 inches 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 screw (5), spring (3) and the plunger (2) using a small wooden dowel inserted in the
center of the plunger. The plunger should slide out very easily.
e. Remove the landing gear selector spool (19) by grasping the rack (teeth) end of the spool and
pulling it from the manifold.
NOTE
DO NOT bend the selector spool, pull straight out. The landing
gear selector spool (19), time delay plunger (2) and the manifold
(35) are matched, lapped parts. If it is necessary to replace any of
these three parts, replace them as an assembly only.
f.
Remove the landing gear handle-release retainer (26), spring (25) and plunger (23) from the
manifold. The end of the plunger has a ball which should remain in the plunger. If it does not, remove the
ball from the manifold.
g.
Remove the caps and the fittings and wash the manifold in cleaning solvent (Federal
Specification P-S-661 or equivalent) and dry with filtered, compressed air. Be sure internal passages are
clean. Reinstall caps on fittings.
6-59. DISASSEMBLY OF HAND PUMP SUCTION SCREEN. (Refer to Figure 6-18, item 48.)
a. Remove the suction screen (50) by removing the snap ring (49).
6-60. DISASSEMBLY OF HAND PUMP RELIEF VALVE. (Refer to Figure 6-18, item 51.)
a. Remove the adjusting screw (52) at the top of the hand pump relief valve.
b. Remove the hand pump relief valve body (55) by unscrewing from the body (67).
c. Remove the spring (53) and the stem (54) from body (55).
d. Remove ball (56).
e. Use a brass hook and remove the seat (57) from the body (67). Be careful not to score the bore.
f.
Remove the "O" ring (58) from the bottom of the cavity.
Revised: 10/12/83
HYDRAULIC SYSTEM
Effectivity
2C8
WIEBEL