Bulletin HY13-1650-M1/USA
Piston Pump Service Procedure
P2 / P3 Series
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee US
8
Troubleshooting Checklist
1. Hose fittings loose, worn or
damaged.
2.Oil seal rings deteriorated by
excess heat.
3.Bolt loose or its sealing area
deteriorated by corrosion.
4.Shaft seal worn or damaged.
1. Pump not installed correctly.
2. Pump not getting oil.
1. Flow has an unrestricted path
1. Pump control settings too low.
2. Control is malfunctioning.
3. Internal leakage in cylinders,
valves, motors or pumps.
Oil Leakage
No Flow from
Pump (If pump
does not prime in
30 seconds STOP!)
Can’t Build Any
Pressure
Can only build a
few hundred PSI
(20-30 bar)
Check & replace damaged
fittings or “O” Rings. Torque to
manufacturers specifications.
Replace oil seal rings by disassembling Pump unit.
(a) Loosen then tighten single bolt to
torque specification.
(b) Replace bolt.
(a) If pump is single shaft seal option:
- Remove seal carrier from pump.
- Remove damaged seal from seal
carrier.
- If shaft is worn, install new seal in the
inner position.
- Reinstall seal carrier.
(b) If pump is dual shaft seal option:
- Remove seal carrier from pump.
- If shaft is damaged or worn, replace
shaft and seals.
- If shaft is not damaged, replace seals
and reinstall seal carrier.
NOTE: Check fluid leaking from housing weep
hole to better determine which seal has failed.
If pump is leaking hydraulic fluid the inboard
seal has failed. If the pump is leaking trans-
mission fluid the outboard seal has failed.
Check proper drive rotation. Make sure pump shaft
is turning (i.e. drive coupling is engaged). Check for
sources of suction leaks, inlet flange tight?
Pinched o-rings?
Make sure reservoir is full of oil.
Is it an open circuit to the reservoir.
Is compensator setting backed out? If load sense,
is there a load sense pressure signal? Is the
system relief valve vented?
Assure orifices in control are not plugged. Assure
control spools/springs are assembled correctly.
If non-torque control pump, assure m 6x6 set screw
is installed in torque control feed port.
Repair component.
CAUTION: If the hydraulic system fluid becomes overheated [in excess of 90°C (194°F), seals in the system
can shrink, harden or crack, thus losing their sealing ability.
Trouble Cause Remedy
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