Bulletin MSG30-3245-INST/UK
Installation Manual
13
Parker Hannifin
Pump & Motor Division Europe
Chemnitz, Germany
Axial Piston Pump
Series PV, series 44 and higher
Reason Horse power compensator setting changed.
Solution Check setting of horse power compensator and correct it, if required.
Reason Proportional displacement control is not connected as required.
Solution Check wiring; connect according to installation manual for electronic module.
Reason Displacement transducer (LVDT) adjustement changed.
Solution Correct zero setting at displacement transducer.
Reason Electronic module has no supply power.
Solution Make sure module is powered with 22 - 36 V DC.
Reason Plug instead of orifice Ø 0.8 mm in the load sensing line to pump.
Solution Install orifice as required.
Reason Cylinder block lifts from valve plate due to excessive wear.
Solution Send pump to factory for service.
Pump does not compensate.
Reason No orifice is in load sensing line to compensator code FFC.
Solution Install orifice Ø 0.8 mm as shown in circuit diagram (page 8).
Reason No pressure pilot valve connected to compensator or valve is blocked.
Solution Connect pressure pilot valve to compensator, make sure valve opens as
required.
Reason Load sensing line connected incorrectly (e. g. upstream of load sensing valve)
Solution Connect load sensing line downstream (actuator side) of load sensing valve..
Reason No or too low pressure at pump outlet port.
Solution Pump outlet pressure must be at least 15 bar, because otherwise the bias spring
in the pump cannot be compressed.
Pump does not upstroke, sticks at zero displacement.
Reason Compensator is blocked due to contamination.
Solution Clean hydraulic fluid, clean compensator valve.
Reason Cable to LVDT or proportional solenoid is interrupted.
Solution Check wiring and make sure cable is ok. Replace if necessary.
Compensator is unstable.
Reason Compenstor spool sticks, due to contamination of hydraulic fluid.
Solution Clean hydraulic system, clean compensator valve.
Reason Compensator differential pressure changed (too low or too high).
Solution Adjust compensator differential pressure to required setting.
Reason Wrong pilot orifice or pressure pilot valve improperly selected.
Solution Select pilot orifice and pressure pilot valve as recommended.
Reason Dynamic critical system, e. g.: pressure compensator combined with pressure re-
ducing valve, load sensing (flow) compensator combined with flow control valve.
Solution Use remote pressure compensator instead of standard pressure compensator,
install orifice in load sensing line remote from compensator (as close as possible
to load sensing valve).
For additional questions, your need of spare parts or in case
of service needs please contact:
Parker Hannifin Manufacturing Germany GmbH & Co KG
Pump & Motor Division Europe
Neefestr. 96
09116 Chemnitz
Tel.: +49-(0)371 / 3937-0
Fax: +49-(0)371 / 3937-488
Internet: www.parker.com/pmde
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