Gear pumps gr. 1

Our gear pumps size 1 (HM1) efficiently convert mechanical energy into hydraulic pressure and flow, making them the ideal choice for a wide range of hydraulic systems. Learn more about our size 1 gear pumps in the FAQs.

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Picture1 Hydraulic Gear Pump, Group 1 HM1-1-1199-C
Hydraulic Gear Pump, Group 1, europ. flange, pipe mounting, Conical shaft 1:8, Selectable displacement 1 up to 7,9 ccm/REV
  • group 1
  • displacement 1 ccm/REV
  • shaft: conical 1:8
  • centering Ø 25,4mm
  • inlet / outlet port: pipe mounting 3/8’’
  • Plessey flange
  • rotation direction: right
80,66 EUR
68,94 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
68,94 EUR excl. 17% tax
Hydraulik gear pump group 1 ccm M6 3.4 front
Hydraulic Gear Pump, Group 1, Europ. flange, side ports flange connection, conical shaft 1:8, selectable displacement from 1 ccm/REV up to 7 ccm/REV
  • group 1
  • selectable displacement from 1 ccm/REV up to 7 ccm/REV
  • shaft: conical 1:8
  • centering Ø 25,4mm
  • inlet / outlet port: 4x M6 / Ø 30mm, type 1
  • Plessey flange
  • rotation direction: right
80,66 EUR
68,94 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
68,94 EUR excl. 17% tax
Hydraulik gear pump group 1
Hydraulic Gear Pump, Group 1, Europ. flange, side ports type 2, conical shaft 1:8, Selectable displacement 1 ccm/REV up to 7,8 ccm/REV
  • group 1
  • selectable displacement von 1 ccm/REV up to 7,8 ccm/REV
  • shaft: conical 1:8
  • centering Ø 25,4mm
  • inlet / outlet port: 4x M6 / Ø 30mm, type 2
  • Plessey flange
  • rotation direction: right
80,66 EUR
68,94 EUR excl. 17% tax
incl. 17% tax excl. Shipping costs
68,94 EUR excl. 17% tax
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These robust hydraulic pumps offer a constant displacement from 1 to 7.9 cm³ and achieve nominal pressures from 170 to 250 bar. Thanks to their simple design and attractive price level, our HM1 pumps are perfectly suited for applications in industry, agriculture, and construction machinery.

 

HM Gear Pumps Size 1 – Frequently Asked Questions

What are the requirements for inlet pressure and fluid inlet velocity?

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

How is the ordering code for HM1 gear pumps structured?

The ordering code for HM gear pumps consists of several sections:

  • Group: HM1
  • Displacement: specified in cm³ (e.g., 1, 1.25, …, 7.9)
  • Shaft: type (e.g., Type 01 Tapered 1:8)
  • Flange: type (e.g., Type 01 Plessey)
  • Suction and pressure ports: connection type (e.g., 4 x M6 / Ø30, G 3/8" thread)
  • Rotation: Clockwise (C) or Counterclockwise (A)

What different types of HM gear pumps are offered?

We offer several types, mainly differing in their port configurations and the related technical data:

  • HM1-1111-C/A: features 4 x M6 / Ø30 ports for suction and pressure sides
  • HM1-1122-C/A: also with 4 x M6 / Ø30 ports, but with specific dimensions and nominal speed ranges
  • HM1-1199-C/A: characterized by G 3/8" threaded ports
  • HM1-1122-C/A-DBV: this variant of the HM1-1122-C/A is equipped with a pressure relief valve (DBV)

How do the nominal pressure and nominal speed depend on displacement?

The nominal pressure and nominal speed of the gear pumps are directly dependent on the displacement. In general:

  • Larger displacements (e.g., 7.9 cm³) tend to have a lower nominal pressure (170 bar) and lower maximum speeds (700–2000 RPM)
  • Smaller displacements (e.g., 1 cm³) allow for higher nominal pressures (250 bar) and higher maximum speeds (700–3500 RPM)

What do the letters C and A in the model designation mean?

The letters C and A in the model designation indicate the rotation direction of the gear pump. C stands for clockwise rotation and A for counterclockwise rotation. This specification is important for correct installation and proper operation of the pump in your hydraulic system.

What port configurations are available for HM gear pumps?

Our HM gear pumps offer various port configurations for maximum flexibility:

  • 4 x M6 / Ø30 ports: standard port configuration for most applications
  • G 3/8" threaded ports: for applications requiring threaded connections

The choice of port configuration depends on the specific requirements of your hydraulic system and the existing line connections.

What is a pressure relief valve (DBV) and when is it needed?

A pressure relief valve (DBV) is a safety component that protects the hydraulic system from overpressure. In the HM1-1122-C/A-DBV variant, this valve is already integrated. It automatically opens when the preset maximum pressure is reached, diverting excess oil back to the tank. This prevents damage to the pump and other system components due to excessive pressure.