Bulletin MSG30-3245-INST/UK
Installation Manual
12
Parker Hannifin
Pump & Motor Division Europe
Chemnitz, Germany
Axial Piston Pump
Series PV, series 44 and higher
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.
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