QX Internal Gear Pumps


Pump ‘all-rounders’ up to 400 bar

The QX series is the 5th generation of Bucher's internal gear pumps and has proven itself for decades in the mobile and industrial hydraulics markets. Many aspects of the design have been enhanced, and it is characterized by a simple layout with relatively few components. It is exceptionally compact and robust. As a direct result of the special gear profile that Bucher uses, QX pumps achieve extremely low levels of pulsation and noise emission, even at high pressures and speeds. Thanks to the wide range of variants, QX pumps can be used for virtually all applications.


  • Open circuits up to 400 bar max. working pressure
  • Wide range of displacements up to 500 cm3/rev
  • Extremely low noise levels < 75 dB(A)
  • Long service life
  • Can be used with all hydraulic fluids
  • Can be used with fixed- and variable-speed drives

Technical Data

Type Operating pressure (continuous) up to
Operating pressure (intermittend) up to
Speed max.
QX2... 100-320 125-400 3-16 3600
QX3... 100-360 125-400 10-32 3400
QX4... 100-360 125-400 20-63 3200
QX5... 100-340 125-400 40-100 3000
QX6... 100-330 125-400 80-250 2500
QX8... 100-330 125-400 160-450 1800


  • Hydraulic presses
  • Machine tools
  • Waste compactors
  • Pressure die casting machines
  • Elevator/lift drives
  • Power units
  • Plastics-processing machinery
  • Stackers/Forklifts


(Click on the required photo for the animation)

 QX Function


 QX Demontage



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