Parker P1 Series - Page 41

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
41
23. Install bearing spacer as determined from the chart (see step 11.) Install the
rear bearing on the drive shaft.
24 Confirm that compensator rotation, port plate rotation, control and bias
piston location indicate same direction of rotation.
25 Carefully install the assembled port block on the pump housing. Press the
port block to compress the bias spring and install housing bolts. Tighten the
bolts in a cross pattern to insure the port block does not get cocked on the
housing. When port block is seated on the housing, torque bolts in a cross
pattern as specified in chart 4.
26. Install o-ring seals and assembled compensator on side of pump housing.
Pump rotation is indicated by arrow on compensator housing. Torque bolts
to 5 0.25 Nm (45 3 in-lb).
CCW port plates
CW port plates
Dowel
CCW pump with
compensator
CW pump with
compensator
CCW
CW compensator
note slot length
and quantity
Industrial port plates
Mobile port plates
Chart 4
Pump Housing bolt
torque
045
018, 028, 045 Pump Maintenance
Chart 3
Pump Housing bolt
torque
018 51 Nm (38 ft lbs)
028 70 Nm (52 ft lbs)
045 85 Nm (63 ft lbs)
Figure 7
11. Install the cam bearings in the cradle area of the housing. The chamfer on
the back of the bearing must face the outer wall of the housing. Use Loctite
Primer Grade “T” or other suitable primer on screws and mating threads in
housing. Apply Loctite #242 (use sparingly) to screw threads and install
orice screws to hold bearings in place. Torque screws to 3.4 ± 0.25
Nm (33 ± 3 in-lb).
12. Place thin lm of clean oil on cam bearing surfaces. Install cam in housing.
For 045, the cam must be tilted to permit entry into the housing. (Figure 2)
NOTE: The large pocket on the bottom surface of the cam must be on the
same side as the three pressure communication holes on the main housing.
Pump rotation does not affect the assembly of the cam.
13. Install the drive shaft into the pump housing. Position pump horizontally.
Install the rotating group over the pump shaft. Rotate the barrel to insure
that it is seated against the cam. Insure that the pump shaft is seated
properly in the front bearing.
14. Conrm that compensator rotation, port plate rotation, control and bias
piston location indicate same direction of rotation.
15. Carefully install the assembled port block on the pump housing. Press the
port block to compress the bias spring and install housing bolts. Tighten
the
bolts in a cross pattern to insure the port block does not get cocked on the
housing. When port block is seated on the housing, torque bolts in a cross
pattern as specied in chart 3.
16. Install o-ring seals and assembled compensator on side of pump housing.
Pump rotation is indicated by arrow on compensator housing. Torque bolts
to 5 ± 0.25 Nm (45 ± 3 in-lb). (See Figure 7)
PUMP ASSEMBLY PROCEDURES
Continued