Internal Gear (Oil) Pumps

Internal gear pumps are positive displacement pumps that are used to transfer fluids such as gear oil, transmission fluid, steering fluid, hydraulic oil or compressor oil. As the gears inside the pump rotate, they create a void at the pump inlet, which creates suction and helps to draw the fluid in to the pump. As the gears turn, fluid is trapped in the mesh between the inner and outer gear teeth. The mesh between the gears closes at the outlet, and this pushes the fluid out of the pump. Gear pumps are robust and have been designed to operate in extreme conditions including applications with high discharge pressures and temperatures, as well as with more viscous fluids.

Typical Performance

  • Flow range 3 to 570 LPM
  • Differential Pressure to 18 BAR
  • Fluid Viscosity to 2000 cSt
  • Temperature to 200 ºC
  • Max Speed 1750 rpm


  • Internal type gear pump
  • Self Priming
  • Non-pulsating flow
  • Bolt on, integral relief valve (optional)
  • Sintered metal or steel idler gear
  • Horizontally or vertically mounted
  • Carbon Steel rotor
  • EN1561 EN GIS-250 body
  • Modular design for ports
  • Optional reverse feature for fixed port bi-rotational duties
  • Various shaft configurations for mounting to OEM equipment
  • Magnetically coupled (optional)
  • Can be closed coupled to AC/DC drives


  • Cranes / hoists
  • Light hydraulics
  • Lubrication (e.g. pumps)
  • Engine lubrication
  • Fuel supply
  • Gearbox lubrication
  • Large diesel engines
  • Machine tools
  • Filtration
  • Heavy automotive
  • Marine
  • Fuel injection
  • Force fed lubrication
  • Railroad equipment
  • Transmissions
  • Fuels
  • Transformer oils
  • Turbines

For any enquiries relating to internal gear pumps, please contact

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