16. Place the barrel (3) on a clean working surface.
Insert the washers (27) and spring (18) into the center
hole. The washers (27) should be located on both
ends of the spring.
17. Compress the spring (18) using a mechanical
press. Secure the spring with the retaining ring (40).
18. Place the barrel (3) on a clean sheet of paper or
cloth. Insert the three dowels (56) into the holes
located outside of the spline hole. Place the guide
ball (14) on top.
19. Compress manually, and confirm spring(18) force.
20. Hold the guide plate (15) horizontal with one
hand, and insert the nine piston assemblies (5) into
the guide plate bores. The piston shoes should move
freely on the pistons.
21. Support the guide plate horizontally, and insert the
piston assemblies (5) into the barrel bores (3).
22. Place the pump body (1) so that the shaft (8) is
horizontal. Assemble the barrel (3), piston assemblies
(5), guide ball (14) and guide plate (15) together onto
the shaft.
CAUTION: Do not force the shaft spline
into the barrel groove. Carefully rotate
the parts, and apply slight pressure to
work them together. Assembly is correct
when the edge of the barrel is approximately .25
in. below the edge of the pump body.
23. Place the pump body (with shaft end pointing
down) on a fixture, and coat the face of the barrel with
clean hydraulic fluid. Place the gasket (24) on the
pump body.
24. Assemble the plunger (21) and port plate (4) onto
the cover (2).
25. Lightly coat the port plate (4) with grease. Place
the port plate on the cover (2), locating the “U”
shaped slot over the pin (66). See Fig. 10
26. Hold the cover so the plunger (21) does not fall
off. Then carefully place the cover on the pump body.
27. Secure the cover (2) with socket head screws
(46), tightened diagonally. The final tightening torque
should be as follows:
Series
N - m
Lbs. - Ft.
Min.
Max
Min.
Max
HPV-6
5.4
6.9
4.0
5.1
HPV-10
7.8
9.8
5.8
7.3
HPV-15
21.6
25.5
16.0
18.9
HPV-20
39.2
43.1
29.0
31.9
HPV-29
39.2
43.1
29.0
31.9
28. Attach rebuilt pressure compensator to pump
cover (2). Pressure compensator assembly
procedures are listed below, and on the next page.
29. Install the thread seal (54) and hex nut (45) on the
adjusting screw (22), then screw into the hole in the
pump cover (2). Finger tighten until the adjusting
screw bottoms against the plunger. Adjust to desired
volume.
Series
No. of Turns Full to Zero Vol.
HPV-6
8.5
HPV-10
8.5
HPV-15
8.5
HPV-20
9.7
HPV-29
10.5
30. Using a lever or hub, rotate the shaft several
times in the direction indicated by the arrow on the
escutcheon plate (61). Confirm that the pump rotates
freely and smoothly.
31. With the palm of your hand, cover the port on the
side on which the compensator is mounted. Rotate
the input shaft. If air is forced out of the piping port,
the pump is working properly.
32. Screw the case drain plug (58) into the pump
body. Seal other openings with plastic cap seals.
33. Clean the outside of the pump, and re-install onto
the original equipment. If the pump will be stored
before re-installation, coat all unpainted surfaces with
a light coating of oil, and store in a sealed plastic bag.
STANDARD PRESSURE COMPENSATOR
CONTROL (28) ASSEMBLY
1. Carefully clean the compensator body (28-1) and
spool (28-2). Soak in clean hydraulic fluid.
2. Check O-rings (28-8) and (28-9) for deformation or
wear. Replace as needed. Assemble O-ring (28-8) to
cap (28-3). Assemble O-ring (28-9) to spring seat
(28-4).
3. Carefully insert the spool (28-2) into the
compensator body (28-1).
4. Fit the spring seats (28-4) and (28-5) onto both
ends of the spring (28-6). Assemble into the
compensator body.
5. With the adjusting screw (28-11) and nut (28-12)
set on the cap, place the cap on the spring seat (28-
4), and screw into the threaded hole in the
compensator body. Tighten until the edge surface is
flush. Screw (28-11) adjustment rate
approximately 650 psi (45 bar) per turn.
14
Form No. R92.00 Rev. 10/03
PUMP ASSEMBLY (continued)
Figure 10
