90-830234R3 DECEMBER 1997 MID-SECTION - 5B-9
3. A leak path is created between the UP side of the
cylinder and the reservoir when the spool sticks
holding the pilot valve open.
abc de f
a - Cylinder/Manifold Mating Surface
b - O-ring
c - Spool
d - Return Spring
e - Valve Seat
f - Pilot Valve Held Open (away from valve seat)
4. Power trim units with date code 23289 and higher
have improved O-rings and improved surface fin-
ish on the inside of the sleeve to correct the prob-
lem.
5. To correct a slow leak down, check for debris be-
tween the valve seat and valve.
b
a
52792
a - Chip under Valve Tip
b - Rubber Seat
6. Inspect for nicked, deteriorated, or misplaced
O-ring.
d
a
b
c
51560
a - Valve and Seat
b - O-ring
c - O-ring
d - Scribe Mark
Reassembly
1. Install the spool into sleeve from the chamfered
end (end opposite the cross hole).
2. Insert spool into sleeve until end is flush with the
chamfered end of the sleeve. Inserting the spool
too far into the sleeve may allow the spool O-ring
to contact the sharp edges of the sleeve cross
hole and damage the O-ring.
3. After reassembly, insert driveshaft and check
pump rotor resistance to turning - housing halves
can shift/turn during reassembly. Align scribe
marks carefully.
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