Parker P1 Series - Page 40

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
40
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
Figure 6
018, 028, 045 Pump Maintenance
5. Install the locating pin on the port block face.
6. For 045: Apply Loctite Primer Grade T to guide threads and allow to dry. In
-
stall unlubricated o-rings on the control guide and bias guide. Apply Loctite
271 to guide threads. For left hand rotation the bias guide is installed near
-
est to the dowel pin (gure 5A.) For right hand rotation the control guide is
installed nearest to the dowel pin (gure 5B.) Torque the control and bias
guides as specied in Chart 2. For 018, 028: The guides are identical and
press t into the holes. (Not shown in picture below)
7. Apply light oil lm to control piston and install it in the control guide bore.
8. Apply light oil lm to the bias piston. Install the bias spring and the bias
piston in the bias piston guide bore.
9. Apply a light layer of petroleum jelly to the back surface of the port plate.
Install the port plate on the port block, lining up the slot on the port plate
with the locating pin. (Refer to Figure 6)
Chart 2
Pump Control and bias
guide torque
018 Press Fit
028 Press Fit
045 142 Nm (105 ft lbs)
13. Apply a light film 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.
14. Install the locating pin on the port block face.
15. Apply Loctite Primer Grade T to guide threads and allow to dry. Install
unlubricated o-rings on the control guide and bias guide. Apply Loctite 271to
guide threads. For left hand rotation the bias guide is installed nearest to the
dowel pin (figure 5A.) For right hand rotation the control guide is installed
nearest to the dowel pin (figure 5B.) Torque the control and bias guides as
16. Apply light oil film to control piston and install it in the control guide bore.
NOTE: The 140 had a lubrication hole in the piston. Confirm that the hole is
facing the port block. The control guide has nonsymmetrical lubrication
grooves. The end with the closest grooves must be installed towards the
port block.
17
. Apply light oil film to the bias piston. Install the bias spring and the bias
piston in the bias piston guide bore.
18. Apply a light layer of petroleum jelly to the back surface of the port plate.
Install the port plate on the port block, lining up the slot on the port plate with
the locating pin.
19. Install the large o-ring in the groove on the pump housing. Install the three
Teflon o-rings in the pressure communication ports on the pump housing.
20. 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
orifice screws to hold bearings in place. Torque screws to 3.4 0.25 Nm (33
3 in-lb).
21. Place thin film of clean oil on cam bearing surfaces. Install cam in housing.
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.
22. 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.
Figure 5A
Port Block with Left
Hand configuration
Figure 5B
Port Block with Right
Hand configuration
specified in Chart 3.
Locating pin
Bias Piston
Guide
Control Piston
Guide
Chart 3
Pump Control and bias
guide torque
045
045 Picture
10. Install the large o-ring in the groove on the port block. Install the three tef-
lon o-rings on the pressure communication ports of the port block.
PUMP ASSEMBLY PROCEDURES
Continued