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Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump & Motor Division Europe
Chemnitz, Germany
Axial Piston Pump
Series PV, series 47 and higher
Bulletin MSG30-3245-INST/UK
Installation manual
11. Trouble shooting guide
Pump delivers no output flow.
Drive motor does not turn.
Reason
Motor is not connected correctly or one of the three phases has failed.
Motor does not turn smoothly when pump is disconnected from pump.
Solution
Check motor connections, check electrical power supply.
Reason
Pump mechanically blocked. Motor turns smoothly when disconnected from pump.
Solution
Send pump to factory for service.
Drive motor only turns at slow speed.
Reason
Motor is not selected properly. In star circuit not enough torque.
Solution
Start pump at unloaded system. Use motor with more horse power.
Reason
Pump is hydraulically blocked. No function of compensator, no pressure relief valve.
Pump stops after e few turns.
Solution
Check function of pump compensator (see below). Start pump at unloaded system.
Drive motor turns, pump does not turn.
Reason
Coupling is not or not correctly mounted.
Solution
Check coupling assembly and correct it.
Drive motor turns and pump turns.
Reason
Wrong direction of rotation.
Solution
Change direction of motor rotation.
Reason
Fluid reservoir empty or not filled to level, suction line ends above fluid level.
Solution
Fill reservoir to required level, if necessary increase suction pipe length.
Reason
Suction line is blocked. E.g. by plugs, cleaning tissues, plastic-plugs.
Ball valve in the suction line closed. Suction filter blocked.
Solution
Check suction line for free flow. Open valves in suction line. Valves should be
equipped with electrical indicator. Check suction filter.
Reason
Suction line not gas tight, pump gets air into suction port.
Solution
Seal suction line against air ingression.
Reason
Pressure line / system is not able to bleed air out.
Solution
Unload pressure port, unload system before start, bleed air from pressure line.
Pump does not build up pressure, but delivers full flow at low pressure.
Reason
Standard pressure compensator is set to minimum pressure.
Solution
Adjust compensator setting to desired pressure.
Reason
Orifice in remote pressure compensator blocked.
Solution
Make sure orifice Ø 0.8 mm in control spool is free and open.
Reason
No pressure pilot valve connected to port P
R
.
Solution
Install suitable pressure pilot valve and adjust it to the desired setting.
Reason
Multiple pressure pilot selector valve is not energized. Pump works in stand-by.
Solution
Energize selector valve solenoid.
Reason
No load sensing line connected.
Solution
Connect system load sensing port to compensator.
Reason
Load sensing valve is closed or too small.
Solution
Open load sensing valve, use larger valve size.
Reason
Too much pressure drop between pump and load sensing valve.
Solution
Make sure connection is wide enough and has not too much pressure drop.
Reason
Differential pressure at compensator is adjusted improperly (too low).
Solution
Check differential pressure adjustment and correct it as described above.
