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External Gear Pump

And Motor Series


Bucher Hydraulics has developed a new external series of gear pumps and motors: AP/APM212. Through improvements in design, manufacturing techniques and manufacturing control based on the latest technology, we have achieved high operating pressures, excellent volumetric and mechanical efficiency, minimal noise, reduced vibration and low flow pulsation. This series includes a specially developed unit, Low Noise (LN), with even less operating noise.

The AP/APM212 series reflects the ECOdraulics concept developed by Bucher Hydraulics. The goal of ECOdraulics is to reduce the burden on the environment by manufacturing products that meet the following criteria: reduced energy consumption; less noise or heat loss; optimised efficiency through system design. The low pulsation design of the new AP/APM212 reduces both power unit noise and vibration in the entire hydraulic system. In addition, the new design meets customer needs for a long life expectancy.


Technical Data



Max. cont. pressure

Fluid temperature range

Recommended fluids

Viscosity range





Standard sealing material

Values, Units

4.4-27.1 cm3/rev

250 bar

-20 to +80°C

hydraulic mineral oil-based

Recommended: 20-120 mm2/sec (cSt)

Permitted: up to 700 mm2/sec (cSt)

Permitted for starting: 2000 mm2/sec (cSt)

For operation pressure >170 bar:
21/18/15 ISO4406

For operating pressure <170 bar:
22/19/16 ISO4406



Product Advantages:

  • Lower pressure pulsation and less noise thanks to a higher number of teeth and new profile
  • Longer working lifetime due to high performance material and innovative heat treatment
  • Larger and stronger shaft for increased transmitting torque
  • Integrated valves in the cover to save space and assembling costs