Parker P1/PD Series User Manual

Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2708-02/SVC/EN | July 2019
Medium Pressure Axial Piston Pumps
P1/PD B-mod Service Information
35
Pump Disassembly Notes
1. Identify the pump from the information on the data tag. See Figure 1.
2. Drain uid from housing. Fluid drained from pump should be disposed of properly.
3. Mount pump in xture to prevent movement while removing the main housing
bolts (#1).
4. Remove the four bolts holding the compensator assembly to the pump housing.
Additional uid may drain out of the passages when the compensator is removed.
For compensator disassembly instructions, see Compensator Disassembly
Procedures section.
5. Remove the four bolts (#1) attaching the port block to the main housing.
6. Carefully remove the port block (#3) assembly. Except for the 18 & 28cc pump,
the control piston guide (#14) and bias guide (#11) are threaded with Loctite into
the block (#3). Use caution to avoid dropping the port plate (#9). Note the location
of the bias spring (#13) and piston (#12) assembly and the control piston (#15)
assembly. The control piston (#15), bias piston (#12), and bias spring (#13) may
remain in the pump when the port block is removed. Remove these items from
inside the pump if they remained in the pump when the port block was removed.
Remove and discard the white Teon O-rings (#8) on the port block. These seals
should be replaced every time the pump is disassembled.
NOTE: For rotation change, do not disassemble further. See Rotation
Change Procedure.
7. For the 60-140cc pumps, remove the tapered roller bearing cone (#18) and
shims (#17).
A. Pump disassembly for inspection should be limited to the
following cases:
a.) Malfunction or oil leakage resulting from damage or wear
and tear.
b.) Troubleshooting steps/actions listed towards the end of the
manual do not solve the problem.
B. For rotation change or shaft conversion, disassembly should be done only as
far as necessary to complete the conversion.
C. Disassembly and reassembly should be performed in a clean environment.
After disassembly, the internal parts should be coated with a lm of clean oil
and protected from dirt and moisture. Care must be taken to avoid dropping,
damaging, or contaminating the machined parts and control valve.
D. It is usually not necessary to replace spring (20) tted in cylinder barrel.
Do not replace the spring unless absolutely necessary.
CAUTION: Spring assemblies in the pump are normally set under high
compression and bodily injury may occur if caution is not taken
during disassembly.
Pump Disassembly Procedure
Figure 1 Pump Data Tag
Pump Service Procedures

Parker P1/PD Series Specifications

General

Brand	Parker
Model	P1/PD Series
Category	Water Pump
Language	English