Parker P1 Series - 018, 028, 045 Assembly

Parker Hannin Corporation
Hydraulic Pump and
Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2665-02/SVC/EN
Medium Pressure Axial Piston Pumps
P1/PD Maintenance
39
018, 028, 045 Pump Maintenance
For major overhauls, all plugs should be removed, and the seals replaced. Prior
to assembly, all parts should be thoroughly cleaned. Assembly should be
performed in a clean work environment.
Do not use bearing grease during installation. Grease does not dissolve in
hydraulic oil and may plug orices or lters in the system. Clean petroleum jelly is
preferred to lubricate o-rings and seals, and to adhere parts for assembly.
NOTE: For uids other than petroleum based hydraulic oil, insure that petroleum
jelly is compatible with the uid. If not compatible, another product should be
used instead.
Inspect all bearing surfaces and seal areas to insure that they are free from
nicks, dings, scratches, and rust.
1. Turn housing over. Using installation tool T1, press the shaft seal in the
seal bore. Install the snap ring into the groove in the seal housing bore.
NOTE: Install shaft and bearing on 45 unit before installing shaft seal.
T1 tool not used on 45 unit, use T3 tool to insert shaft seal over input shaft.
2. Install cylindrical bearing on pump shaft (slip t). Install external retaining ring
to hold bearing in place on the shaft. Insert shaft assembly into the pump
housing with the bearing sliding into the bearing diameter in the housing.
Install internal retaining ring into the housing. (See drawing)
3. If barrel hold down spring was removed during disassembly process, install
three pins to slots in barrel spline (45 Size only). Petroleum jelly can be used
to hold pins in place while installing remaining parts. (Figure 4) Place barrel on
xture with pin side down. Install backup washer and hold down spring and
second back up washer. Compress spring in press and install snap ring.
Caution: Make sure snap ring is properly seated in groove prior to removing
barrel from press.
4. Apply a light lm of oil into the piston bores. Lightly lubricate the spherical
surface of the guide ball. Install the nine pistons into the bores in the hold
down plate. Install the spherical guide ball into the hold down plate. While
holding the guide ball against the hold down plate, install the pistons into
the barrel.
ASSEMBLY PROCEDURE
CONTINUED 9. Repeat the procedure three times. Once recorded, take the average of the
three measurements.
10. With the average, use chart 2 to determine the correct shim to install in the
pump.
11. If barrel hold down spring was removed during disassembly process, install
three pins to slots in barrel spline. Petroleum jelly can be used to hold pins in
place while installing remaining parts. (Figure 4) Place barrel on fixture with
pin side down. Install backup washer and hold down spring. Compress
spring in press and install snap ring. Caution: Make sure snap ring is
properly seated in groove prior to removing barrel from press.
Figure 4
CHART 2
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minimum maximum thickness 018 part # 028 part # 045 part #
PUMP ASSEMBLY PROCEDURES