Hydraluic Pump Disassembly - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
6-153. DISASSEMBLY OF HYDRAULIC PUMP. (Refer to Figure 6-28.)
a.
Clean outside of pump thoroughly.
b.
Mark a line from the rear side, across the centerplate to the drive side with blue Dykem or some
equivalent removable substance. This will assure proper reassembly.
CAUTION
During disassembly do not use a screwdriver or sharp tool to
separate the parts.
c.
Remove the four socket head cap screws (12), securing the rear side (13), centerplate (10) and
drive side (7) together. These screws are threaded into the drive side.
d.
Remove the four locknuts (8) from the studs (14) extending out of the drive side flange that
mates with the centerplate.
e.
Remove the rear side by rocking it from side to side and sliding it from the four dowels (11). In
case of sticking, tap gently with a plastic or rubber hammer.
f.
Remove the four studs (14) from the rear side. Remove and discard the large "O" ring seal (15)
from the rear side. Pull the drive (1) and secondary shafts (17) until drive pins (16 and 2) clear gears.
Remove drive pins.
g.
Remove drive gear (19), secondary gear (18), and secondary shaft (17) by pulling from
centerplate (10).
h.
Remove drive shaft by pushing out of drive side. Remove centerplate, with dowels, by rocking it
from side to side.
i.
Remove large "O" ring seal (9) from drive side and discard.
j.
Remove retainer ring (3) securing seal (4 or 5) in drive side seal bore. Note proper position of seal
(4 or 5) upon disassembly. Seal must not be reversed at reassembly. Remove and discard the two part seal.
Reissued: 9/23/80
2D5
HYDRAULIC SYSTEM