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7. Use a 13 mm socket wrench to loosen and remove
the twelve capscrews (2) and lockwashers (3) from
the inlet manifold (1). See Fig 16.
8. Lift the manifold (1) off the inlet valve housing (6)
and remove the seats (17 and 22). Remove the
o-ring (16) from the seats.
CAUTION
If the pressure relief valve in the inlet seat (22) is
clogged or filled with material, soak the inlet seat in a
compatible solvent. Make sure all material residue is
cleaned from the ball and seat area.
If the relief valve cannot be thoroughly cleaned so
that the ball and spring are free to move, replace the
seat (22).
9. Inspect the pressure relief valve in the fluid inlet
seat (22) to make sure it is not clogged. Press
down on the valve's ball to see if the ball and
spring are free to move. See the detail in Fig. 16.
CAUTION
Be careful not to drop or damage the balls (13) or
seats (17 or 22). A damaged ball or seat cannot seal
properly and the pump will leak. One inlet valve seat
(17) can be reversed to provide longer use of the
seat. However, the fluid inlet seat (22) contains a
pressure relief valve and is not reversible. See the
detail in Fig. 16 for proper orientation.
10. Remove the balls (13), ball guides (14) and seals
(15) from the inlet valve housing (6).
11. Push the piston assembly through the cylinder just
enough to expose the piston (23) flats. Secure the
piston flats in a vise. Use a plastic mallet to tap the
cylinder (27) up and off the piston assembly.
NOTE: Refer to Fig. 11 for Steps 12–16.
12. Loosen the piston nut (26). Use Tool Kit 220385 to
remove the piston shaft (29) and piston nut (26).
See Fig. 12. Remove the piston nut o–ring (18)
and o–ring retainer (43) from the shaft. Remove
the plate (25) and the seal (24) from the piston
(23).
13. Inspect the piston shaft (29). If it is damaged or
the surface is scored, replace it.
20
309136
Service
14. Clean all piston parts and the cylinder thoroughly
in a compatible solvent. Inspect the inner surface
of the cylinder for scoring, and replace it if neces-
sary. A scored cylinder will quickly damage the
packings.
15. Lubricate the new piston seal (24*) and install it on
the piston.
16. Install the piston plate (25) with the beveled edge
facing away from the piston seal.
1
Torque to 270–284 NSm (200–210 ft-lb).
Apply medium strength sealant to threads.
2
Lubricate.
3
Apply anti-seize lubricant 222955 to the face of pis-
4
ton nut (26)
43
26
1
2
4
Fig. 11
Tool Kit 220385
Tighten the tool on the widest
part of the shaft (29). Grip the
tool with a wrench and
unscrew the shaft.
Fig. 12
29
2
18
19
25
24*
23
3
TI0219
29
01413
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