Parker P1 Series

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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

10. Remove cam bushing screws and cam bushings from pump.

11. Remove snap ring in housing and shaft bearing assembly.

12. If completing a seal change or a complete overhaul turn the housing over

and remove the snap ring and shaft seal from the housing.

12a. If you are working on an 045 pump please omit this step as this

has already been completed in step 8a.

12b. Always use a new shaft seal. Do not reuse old shaft seal.

13. If there is excessive wear on the port block bushing; remove the bushing

from the port block.

14. If complete overhaul or rotation change, remove control piston and bias

piston guides. The Control piston and bias piston guides are installed with

Anaerobic thread lock. Place the port block in an oven at 163°C (325°F).

NOTE: to prevent annealing of heat treated surfaces DO NOT USE A TORCH

TO HEAT PISTON GUIDES. (45 Size only)

NOTES: Access plugs on end of compensator spool bores are hardened plugs.

Do not interchange with other plugs in the control. For rotation change, the

complete compensator assembly will need to be replaced.

1. Measure and record the extension of the two pressure adjusting screws.

2. Carefully remove the main compensator spring cap. Remove the two

springs. Remove the seal piston and spring seat. Remove the o-ring boss

access plug on the opposite side of the compensator. Remove the

compensator spool. NOTE: the compensator spool and inner spring are not

interchangeable with the load sense compensator spool and spring.

3. Load sense compensator: Carefully remove the load sense compensator

spring cap with spring seat/seal piston. Remove the spring. Remove the

spring seat. Remove the o-ring boss access plug on the opposite side of the

compensator. Remove the load sense compensator spool. NOTE: the load

sense compensator spool and spring are not interchangeable with the main

compensator spool and inner spring of the main compensator.

4. Remove all SAE o-ring boss access plugs.

Proceed to inspection section of this manual.

COMPENSATOR DISASSEMBLY

PUMP DISASSEMBLY

Continued

018, 028, 045 Pump Maintenance

Parker P1 Series - Page 36