Parker PQDXXA-Z10 - User Manual

Questions and Answers

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Sarah LopezAug 18, 2025
What to do if Parker Control Unit pump delivers full flow at low pressure but does not build up pressure?
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  Jennifer PeckAug 18, 2025
  If your Parker Control Unit pump delivers full flow at low pressure but doesn't build up pressure, there could be several reasons. The standard pressure compensator might be set to minimum pressure; adjust the compensator setting to the desired pressure. There might be no pressure pilot valve connected to port P . R; install a suitable pressure pilot valve and adjust it to the desired setting. If a multiple pressure pilot selector valve is not energized, the pump will work in stand-by; energize the selector valve solenoid. Finally, the differential pressure at the compensator might be improperly adjusted (too low); check the differential pressure adjustment and correct it.
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Anna FrenchAug 21, 2025
Why Parker Control Unit pump delivers no output flow and drive motor does not turn?
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  Michael HoweAug 21, 2025
  If the pump in your Parker Control Unit isn't delivering any output flow and the drive motor isn't turning, it could be due to a few reasons. The motor might not be connected correctly, or one of the three phases could have failed; check the motor connections and the electrical power supply. Alternatively, the pump might be mechanically blocked; in this case, send the pump to the factory for service.
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David FernandezAug 25, 2025
Why Parker Control Unit drive motor only turns at slow speed?
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  Jeffrey MooreAug 26, 2025
  If the drive motor in your Parker Control Unit only turns at slow speed, it could be due to the motor not being selected properly; consider using a motor with more horsepower. Alternatively, the pump might be hydraulically blocked; check the function of the pump compensator and start the pump at an unloaded system.
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Connor PachecoAug 28, 2025
How to fix unstable compensator in Parker Control Unit?
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  Maria RubioAug 28, 2025
  If the compensator in your Parker Control Unit is unstable, it could be due to several factors. The compensator spool might be sticking due to contamination of the hydraulic fluid; clean the hydraulic system and the compensator valve. The compensator differential pressure might have changed (too low or too high); adjust it to the required setting. The wrong pilot orifice or pressure pilot valve might be improperly selected; select the pilot orifice and pressure pilot valve as recommended. If it is a dynamic critical system (e.g., a pressure compensator combined with a pressure reducing valve), use a remote pressure compensator instead of a standard pressure compensator.
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floresstaceyAug 31, 2025
What causes Parker Control Unit pump to deliver full flow at low pressure but not build up pressure?
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  Dr. Kelly Gibson DVMAug 31, 2025
  If your Parker Control Unit's pump delivers full flow at low pressure but doesn't build up pressure, it might be due to a changed horsepower compensator setting; check and correct the setting if required. The proportional displacement control might not be connected correctly; check the wiring and connect it according to the installation manual for the electronic module. The displacement transducer (LVDT) adjustment might have changed; correct the zero setting at the displacement transducer. The electronic module might not have supply power; ensure the module is powered with 22 - 36 V DC. Finally, the cylinder block might be lifting from the valve plate due to excessive wear; send the pump to the factory for service.
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Gilbert Taylor DDSSep 4, 2025
What to do if Parker Control Unit pump does not upstroke and sticks at zero displacement?
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  Jessica PorterSep 4, 2025
  If the pump in your Parker Control Unit doesn't upstroke and sticks at zero displacement, it could be because the compensator is blocked due to contamination; clean the hydraulic fluid and the compensator valve. Alternatively, the cable to the LVDT or proportional solenoid might be interrupted; check the wiring and ensure the cable is okay, replacing it if necessary.
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Rebecca MartinSep 7, 2025
Why Parker Control Unit pump does not compensate?
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  aweaverSep 7, 2025
  If the Parker Control Unit pump does not compensate, it might be because there is no pressure pilot valve connected to the compensator, or the valve is blocked; connect a pressure pilot valve to the compensator and ensure the valve opens as required. Also, check if there is no or too low pressure at the pump outlet port; the pump outlet pressure must be at least 15 bar, because otherwise the bias spring in the pump cannot be compressed.
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Steven ThompsonSep 10, 2025
What to do if Parker Control Unit drive motor turns, but the pump does not turn?
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  Marcus NormanSep 12, 2025
  If the drive motor turns but the pump does not turn in your Parker Control Unit, the coupling might not be mounted, or not correctly mounted. Check the coupling assembly and correct it.
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richard76Nov 14, 2025
What to do if the drive motor and pump turns, but there is no output in Parker Control Unit?
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  watsonshannonNov 14, 2025
  If the drive motor and pump are turning but there's no output, several issues could be at play. First, the direction of rotation might be incorrect; try changing the motor's rotation. The fluid reservoir may be empty or not filled to the correct level, or the suction line ends above the fluid; fill the reservoir to the required level and, if needed, increase the suction pipe length. A blocked suction line could also be the culprit; check it for free flow, ensure any valves in the line are open and equipped with electrical indicators, and inspect the suction filter. Additionally, the suction line might not be gas-tight, causing the pump to draw in air; seal the suction line to prevent air from entering. Finally, the pressure line or system may not be able to bleed air; unload the pressure p...