HG Series Ultra-Low Noise Stable Output Wide Speed Range Hydraulic Gear Pump

HG Series Gear Pump Single Pump

Features

It uses axial and radial pressure compensation design—so volumetric efficiency stays high even at low speeds or low viscosity.

Ultra-Low Noise & Stable Output

Made of high-strength cast iron with exclusive internal noise reduction: noise levels stay very low.

Minimal flow and pressure pulsation: stable output even at low speeds.

High-Pressure & Wide Speed Range

Max working pressure reaches 35MPa.

Wide speed range: up to 3000r/min.

Versatile & Durable

Can be combined into a double pump.

Resistant to oil contamination, long service life.

Widely used in hydraulic systems (e.g., plastic machinery, shoe-making machines, die-casting equipment, forklifts); ideal for servo inverter-driven energy-saving systems.

Structure

The HG series hydraulic pump is a backlash compensation internal gear pump with a fixed displacement.

lts basic composition is: front cover (1), pump body (2), rear cover (3), gear shaft (4), ring gear (5), sliding bearing (6), front and rear side plates (7) and positioning Rod (8), and the radial compensation function composed of the crescent sub-plate (9), the crescent main plate (10) and the plastic rod (11).

Specifications

Model Number Designation

Note: Counter clockwise rotation limited to HG series single pump

Precautions for Use

1.Working medium

Petroleum-based mineral oil with a viscosity range of 10-300mm/s can be used. ISO VG46 anti-wear hydraulic oil is recommended.

2.Working temperature

The working temperature range is -10℃-100℃. In order to ensure long-term reliable life, the best working temperature range is 20℃-80℃.

3.Cleanliness control

The cleanliness level of the control system oil is required to be no more than 9 (NAS 1638) or 17/14 (ISO 4066).

4. Pump installation

When connecting the shaft and the motor, use a flexible coupling as much as possible to avoid bending moment or axial thrust. The maximum allowable coaxiality error between the shaft and the motor shaft is less than0.15mm.

5. Inlet pressure and piping

Allow the absolute pressure ofthe suction port to be 0.2-2Bar. The reasonable piping diameter should not be smaller than the oil suction port of the pump to ensure an average oil suction speed of 0.6-1.2m/s.

6. Import and export connection

Try to avoid hard connection of steel pipes in and out of the oil pipes. Rubber hoses are recommended to avoid additional noise caused by additional loads.

7.Exhaust

Before the first operation, the pump should be filled with oil or an exhaust valve should be added to remove the air in the pump and the system pipeline. If there is air residue in the pump or pipelinelt will cause the vibration and noise of the pump, and indirectly affect the service life of the pump.

8. Maintenance

In order to improve the service life of the pump, the system should be regularly checked for abnormal vibration, noise, oil temperature, whether there is bubble formation in the oil tank, and whether there is leakage and other problems, and timely maintenance.