Bulletin HY13-1650-M1/USA
Piston Pump Service Procedure
P2 / P3 Series
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee US
11
SERVICE NOTES:
* Use a clean lubricant (compatible with the working fluid) on all pump components during assembly.
* Thoroughly clean the reservoir, suction lines, suction strainer, drain lines, etc. before re-installing the pump.
Most premature pump failures occur when contaminants from a previous failure have not been completely
removed from the system, or cause for previous failure is still present (i.e. water in oil, filter bypassing, etc.).
* Always fill the case with the clean fluid before starting a new or service pumps (fill as high as inlet port will
allow on a P3 style pump). For flooded suction, purge air from suction lines by cracking the inlet fitting or vent/
gage plug on pump body. This should prevent an airlock condition and allow for faster priming. Starting the
pump slowly by jogging (or turning over engine without allowing it to start) will help the pump prime and makes it
easier to determine when priming has occurred. Plumb P3 style pump air bleed directly to tank if pump is
mounted above tank.
* Check for proper shaft rotation if there is a possibility it may have changed during a system rebuild.
* Start pump with an open circuit whenever possible. Reduce the compensator to its minimum setting during
start-up. Cycle the pump on and off stroke while increasing the compensator to its required setting. This will
assist in break-in of new components and help purge air from the case.
Technical Information
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