QXM Internal Gear Units


Pump/motor operation in multi-quadrant applications

The QXM series is an extension of the QX pump series and is suitable for operation as both a pump and a motor. Thanks to the completely symmetrical design, these units can be used in multi-quadrant operation and are suitable for a wide range of applications in both industrial and mobile hydraulics. In 4-quadrant operation, the movement of cylinders can be controlled on the one hand, and exploited to recover/save energy on the other. For example, if the unit works as a pump during a lifting process, it can then work as a motor during the lowering process to feed energy back into the system.


  • Open/closed circuits up to 400 bar max. working pressure
  • Low noise level < 75 dB(A)
  • Particularly suitable for multi-quadrant operation
  • Can be used with all hydraulic fluids
  • Can be used with fixed- and variable-speed drives

Technical Data

Type Operating pressure (intermittend) up to
Operating pressure (continuous) up to
Speed max. pump
Speed max. motor
QXM2 400 100-320 5-16 4000 4600
QXM3 400 100-320 10-32 3200 4250
QXM4 400 100-320 20-63 2900 3900
QXM5 400 100-320 40-125 2500 3500
QXM6 400 100-320 80-250 2250 3600
QXM8 400 100-320 160-500 1600 3400


  • Injection molding machines
  • Hydraulic presses
  • Flight simulators
  • Fan drives
  • Wind turbines
  • Elevator/lift drives
  • Winch drives
  • Marine industry

QXM Function

(Click on the photo for the animation)

 QXM Function

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