Gear Pump Assembly 3

Our hydraulic gear pumps size 3 (HM3) efficiently convert the mechanical energy of the drive motor into the flow energy of the operating fluid (pressure and flow). Their simple design and relatively low prices allow for wide use in various hydraulic systems. Learn more about our size 3 gear pumps in our FAQs.

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Gear pump hydraulic group 3 ccm 25 front
Hydraulic Gear Pump, Group 3, European flange type 1, Conical Shaft 1:8, Flange connection, Selectable Displacement 19,5 to 63 ccm/REV, rotation right
  • group 3
  • Selectable Displacement 19,5 to 63 ccm/REV
  • European rectangular flange 4 x Ø 9mm
  • centering Ø 50,8mm
  • shaft: conical 1:8
  • Side ports: flange connection type 4
  • rotation direction: right
175,59 EUR
150,08 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
150,08 EUR excl. 17% tax
Pompe à engrenages Hydraulique, Groupe 3
Hydraulic Gear Pump, Group 3, European flange, Conical Shaft 1:8, Flange connection, Selectable Displacement 19,5 to 63 ccm/REV, rotation right
  • group 3
  • Selectable Displacement 19,5 to 63 ccm/REV
  • European rectangular flange 4 x Ø 11 mm)
  • centering Ø 50,8mm
  • shaft: conical 1:8
  • Side ports: flange connection type 4
  • rotation direction: right
175,59 EUR
150,08 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
150,08 EUR excl. 17% tax
product image Hydraulic Gear Pump, Group 3
Hydraulic Gear Pump, Group 3, European flange, Conical Shaft 1:8, threaded connection, Selectable Displacement 28 to 42 ccm/REV, rotation right
  • group 3
  • Selectable Displacement 28 to 42 ccm/REV
  • European rectangular flange 4 x Ø 11 mm)
  • centering Ø 50,8mm
  • shaft: conical 1:8
  • Side ports: threaded connection type 1
  • rotation direction: right
175,59 EUR
150,08 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
150,08 EUR excl. 17% tax
Hydraulic Gear Pump, Group 3
Hydraulic Gear Pump, Group 3, SAE B flange, splined shaft 13 T 16/32 Dp, Flange connection, Selectable Displacement 22 to 42 ccm/REV, rotation right
  • group 3
  • Selectable Displacement 22 to 42 ccm/REV
  • SAE B Flange
  • centering Ø 101,6
  • shaft: splined shaft 13 T 16/32 Dp
  • Side ports: flange connection type 2
  • rotation direction: right
175,59 EUR
150,08 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
150,08 EUR excl. 17% tax
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These robust HM3 pumps are designed for displacements from 20 to 63 cm³. They achieve nominal pressures from 160 to 250 bar and a nominal speed of 700 to 2500 rpm, with these values depending on the respective displacement. The maximum suction speed of the fluid is 2.5 m/s, and the pumps can operate continuously with an inlet pressure between -0.2 and 0.5 bar.

Thanks to their versatility, our HM3 gear pumps are used in a wide range of applications, including hydraulic power units, hydrostatic circuits in agricultural vehicles, forestry machinery, construction machinery, and machine tools.

 

HM3 Gear Pumps - Frequently Asked Questions

What are the typical applications for HM3 gear pumps?

HM3 gear pumps are widely used in various fields. These include hydraulic systems, hydraulic power units and hydrostatic circuits in agricultural vehicles, construction machinery, and machine tools.

What are the characteristic performance data of HM3 gear pumps?

The characteristic performance data of HM3 gear pumps include:

  • Rated pressure: 160–250 bar
  • Rated speed: 700–2500 rpm
  • Displacement: 20–63 cm³

It is important to note that both rated pressure and rated speed can depend on the respective displacement.

What are the inlet pressure and fluid inlet velocity requirements?

The maximum inlet velocity of the hydraulic fluid should be 2.5 m/s. Under this condition, all pumps can operate continuously with an inlet pressure between -0.2 and 0.5 bar while reliably achieving the outlet pressure specified in the catalogue.

Can HM3 pumps be equipped with additional control functions?

Yes, upon customer request, HM3 pumps can be equipped with pressure regulators or priority flow regulators to enable more flexible control of hydraulic systems. This additional equipment provides enhanced control over system pressure levels and oil distribution.

How is the ordering code for HM3 gear pumps structured?

The ordering code is composed of several parts:

  • Group: HM3
  • Displacement: In cm³ (e.g., 20, 22.5, 25, ... 63)
  • Shaft: Various types such as tapered 1:8 or splined 13T 16/32
  • Flange: Various types such as Plessey (4xØ11), Oval SAE B, or Plessey (4xØ9)
  • Suction and pressure ports: Various types such as Plessey (HEE), DIN (BOSCH) or BSP thread
  • Rotation: Clockwise (C) or Counter-clockwise (A)

An example would be HM3-2444-C/A.

What suction and pressure port variants are available for HM3 models?

The technical datasheets show various port configurations:

  • HM3-2444-C/A and HM3-2144-C/A: Feature suction and pressure ports of the Plessey type (E F d dimensions such as Ø39.7 Ø19 M8, Ø50.8 Ø27 M10, or Ø61.9 Ø33.5 M12)
  • HM3-2411-C/A: Uses BSP threaded ports (e.g., 3/4", 1", 1¼")
  • HM3-2422-C/A and HM3-6322-C/A: Use DIN (BOSCH) ports (A F d dimensions such as Ø55 Ø26 M8 or Ø62 Ø33 M12)

The specific dimensions vary depending on the displacement of the respective pump.

What shaft types are available for HM3 gear pumps?

HM3 gear pumps are available with different shaft types:

  • Tapered shafts 1:8: Standard shaft type for most applications
  • Splined shafts 13T 16/32: For applications requiring high torque and precise power transmission

The choice of shaft type depends on the specific requirements of your drive unit and the desired power transmission.

What flange types are offered for HM3 gear pumps?

HM3 gear pumps are available with various flange types:

  • Plessey (4xØ11): For larger pumps with higher displacement
  • Plessey (4xØ9): For more compact designs
  • Oval SAE B: For applications with SAE standard requirements

The choice of flange allows optimal adaptation to different installation situations and system requirements.

What do the letters C and A in the HM3 type designation mean?

The letters C and A in the type designation indicate the direction of rotation of the HM3 gear pump. C stands for clockwise rotation and A for counter-clockwise rotation. This specification is critical for correct installation and proper operation of the pump in your hydraulic system, as it determines the flow direction.