Pump Assembly
Piston Pump assembly must be done more carefully
than disassembly. The working environment must be
clean. All parts must be clean and inspected for wear
or damage in accordance with the Inspection
Procedures listed on pages 7 through 11.
1. Compare the disassembled parts with the exploded
view shown in Fig. 14 or 15 on page 20 for missing
parts or irregularities.
2. Inspect retaining rings. Replace if deformed.
3. Place the pump body (1) in a press, with the
mounting flange facing up.
4. Apply grease between the lips of the shaft seal.
Grease should not protrude above the tip of the lip,
and should fill approximately 80% of the space.
5. Use a press, and the tool shown in Fig. 5 on page
11, slowly force the shaft seal into the pump body (1)
until seated.
6. Assemble a retaining ring (68) on the shaft end.
The sharp edge of the retaining ring must always be
facing away from the part being retained.
7. Using the ball bearing installation tool shown in Fig.
6 on page 12, press the ball bearing (69) onto the
shaft. Do not exceed the maximum pressing force
guidelines listed as follows.
8. Install the remaining retaining ring (68).
Pressing Force
Series
Bearing Part No
Lbs.
N
HPV-6
258191
1330
5900
HPV10
258192
1500
6700
HPV10
258193
1690
7500
HPV10
258194
2200
9800
HPV10
258194
2200
9800
9. Rotate the bearing manually to check for unusual
noise or binding.
10. Fit the protective cone shown in Fig. 7 on page 12
over the end of the shaft. Apply a light coating of
lithium grease to the outer surface of the cone. Slide
the protective cone and shaft through the shaft seal,
positioning the ball bearing in place.
11. Assemble the retaining ring (41) into the pump
body.
12. Place the housing on a fixture with the shaft end
facing down. Insert the spring (19) and spring seat
(20) into the pump body.
13. Lightly coat the wear plate (16) with grease, and
mate to the hanger (9). Then fit into the pump body.
14. Press the hanger (9) until approximately
horizontal, using a press if necessary. Then install
the trunnions.
NOTE: A used trunnion shaft, turned
down to a slip fit simplifies hanger
installation. Slip the modified trunnion
into one side to hold it in place while the
working trunnion is press-fit into the opposite
side. See Fig. 8, page 12 for trunnion assembly
tool specifications.
15. Lightly coat the trunnions with teflon-based
sealing paste. Avoid putting sealing paste on the
section of the trunnion that will be held in the hanger.
Press them through the pump body, and into the
hanger.
NOTE: Be certain the hanger bores are
correctly aligned with the pump body.
After the trunnions have been installed,
confirm that the hanger moves freely on
them.
13
Form No. R92.00 Rev. 10/03
Trunnion Removal Tool
Series
A
B
C
D
E
F
DIA.
DIA.
THD.
DIA.
HPV-6
In.
1.75
1.50
.56
4.25
1/2-13
2.50
HPV-10 (mm) (44.5) (38.1) (14.2) (108)
(63.5)
HPV-15
In.
2.00
1.75
.81
4.50
3/4-10
2.75
(mm) (50.8) (44.5) (20.6) (114)
(69.8)
HPV-20
In.
2.25
2.00
.81
4.75
3/4-10
3.00
HPV-29 (mm) (57.15) (50.8) (20.6) (121)
(76.2)
Material:
Item . . . . . . . . . . . . . . . Material
(1) Sleeve . . . . . . . . . . Steel
(2) Spacer . . . . . . . . . . Steel
(3) Nut . . . . . . . . . . . . . Hardened Steel GR.5
(4) All-Thread Rod . . . . Hardened Steel GR.5
ASSEMBLY TOOLS (continued)
Figure 9 (not to scale)
ASSEMBLY PROCEDURES
