GHP1 GHP2 GHP1-D-2 GHP2-D-10 GHP2-D-37 Series High Pressure Hydraulic Gear Pump

Product Overview

The GHP1-D-2, GHP2-D-10, GHP2-D-37 and the full GHP1/GHP2 series are high-pressure external gear pumps from the Italian manufacturer Marzocchi Pompe. The GHP1 series covers displacements from 1.4 to 13.8 cm³/rev, while the GHP2 series ranges from 4.5 to 35.2 cm³/rev.

The GHP series is Marzocchi’s high-performance pump line, developed to meet the demands of extremely high-pressure applications. The pump body is manufactured from high-strength extruded aluminum alloy, while the flange and cover are made of spheroidal cast iron. Gears are crafted from case-hardened, tempered, and ground steel. Internally, aluminum bushings with hydraulic compensation zones and DU self-lubricating bearings ensure high efficiency and extended service life. The series is available in both unidirectional and reversible (bi-rotational) configurations.

Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability. Each pump undergoes rigorous 100% simulated duty-cycle testing.

Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with Marzocchi Pompe original equipment. All Marzocchi brand names and model codes are referenced solely to indicate compatibility. This product is manufactured by an independent producer.

Technical Specifications 

GHP1 Series General Specifications (Group 1)

• Brand Series: Marzocchi GHP1 (Group 1)

• Displacement Range: 1.4 – 13.8 cm³/rev

• Max. Continuous Pressure: 270 bar

• Max. Intermittent Pressure: 290 bar

• Peak Pressure: 320 bar

• Maximum Speed: 6,000 rpm

• Flow Rate (@1500 rpm): 2.0 – 19.7 L/min

• Overall Efficiency: ≥90%

GHP2 Series General Specifications (Group 2)

• Brand Series: Marzocchi GHP2 (Group 2)

• Displacement Range: 4.5 – 35.2 cm³/rev

• Max. Continuous Pressure: 280 bar

• Max. Intermittent Pressure: 295 bar

• Peak Pressure: 310 bar

• Maximum Speed: 4,000 rpm

• Flow Rate (@1500 rpm): 6.4 – 50.2 L/min

• Overall Efficiency: ≥90%

Model-Specific Specifications

GHP1-D-2

• Displacement: 1.4 cm³/rev

• Continuous Pressure: 270 bar, Intermittent: 290 bar, Peak: 310 bar

• Maximum Speed: 6,000 rpm

• Flow Rate (@1500 rpm): 2.0 L/min

• Rotation: Right-hand (Clockwise / D)

• Mounting Flange: European standard flange

• Shaft Type: 1:8 tapered shaft

• Dimensions: L 40 mm × W 79 mm

GHP2-D-10

• Displacement: 7.0 cm³/rev

• Continuous Pressure: 280 bar, Peak: 310 bar

• Maximum Speed: 4,000 rpm

• Rotation: Right-hand (Clockwise / D)

GHP2-D-37

• Displacement: 25.2 cm³/rev

• Continuous Pressure: 280 bar, Peak: 310 bar

• Maximum Speed: 4,000 rpm

• Rotation: Right-hand (Clockwise / D)

Key Technical Advantages

1. Spheroidal Cast Iron Flange & Cover – Ultra-High Pressure Durability

The spheroidal cast iron flange and cover ensure minimal deformation even under continuous, intermittent, or peak high-pressure conditions. GHP2 series delivers 280 bar continuous and 310 bar peak pressure.

2. Hydraulic Compensation Bushings – High Efficiency & Long Life

Aluminum bushings feature hydraulic compensation zones with anti-extrusion seals, allowing axial and radial movement proportional to operating pressure. Internal leakage is dramatically reduced, ensuring high volumetric efficiency and proper lubrication.

3. Ultra-Wide Speed & Temperature Range

GHP1 reaches 6,000 rpm maximum speed, GHP2 up to 4,000 rpm. Standard operating temperature from -10°C to +80°C. Optional high-temperature (+120°C / +150°C) and low-temperature (-40°C) versions available.

4. Reversible Configurations – Maximum Installation Flexibility

Available in both unidirectional and reversible (bi-rotational) configurations. Multiple mounting options including European, SAE, and German standards. Supports multiple pump combinations.

5. Case-Hardened Steel Gears – Low Noise & Low Pulsation

Gears manufactured from case-hardened, tempered, and ground steel deliver low noise and low pulsation levels. High-precision machining ensures smooth, quiet operation.

6. 100% Simulated Duty-Cycle Testing

Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure and full speed range—ensuring zero-defect, plug-and-play performance upon installation.

Application Areas

• Construction Equipment: Excavators, loaders hydraulic systems

• Agricultural Machinery: Tractors, combine harvesters

• Industrial Machinery: Presses, injection molding machines, bending machines

• Material Handling: Forklifts, lift platforms

• Heavy-duty Equipment: Mining machinery, oil & gas equipment

• High/Low Temperature Environments: Special seal versions available

Expert Maintenance Tips

1. Fluid Cleanliness Control

Maintain system fluid cleanliness to ISO 4406 19/17/14 or better. Install a ≤10 μm absolute filtration filter upstream of the inlet port.

2. Inlet Line Requirements

Inlet pressure must be maintained between 0.7 – 3.0 bar (absolute). Recommended suction line flow velocity: ≤1.5 m/s to prevent cavitation.

3. Coupling Alignment Precision

Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended.

4. First-Start Priming Procedure

Before initial startup, prime the pump by bleeding air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts under no-load conditions until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.

5. Rotation Direction Confirmation

“D” indicates right-hand (clockwise) rotation; “S” indicates left-hand (counterclockwise) . Reversible versions support bi-rotational operation. Always verify that the drive motor/engine rotation matches the pump before installation.

6. Temperature & Viscosity Monitoring

Recommended fluid: mineral oil per DIN 51525 / VDMA 24317. Standard operating temperature: -10°C to +80°C. Special versions available from -40°C to +150°C.

Related models：

GHP1A-D-2-FG
GHP1A-D-3-FG
GHP1A-D-4-FG
GHP1A-D-5-FG
GHP1A-D-6-FG
GHP1A-D-7-FG
GHP1A-D-9-FG
GHP1A-D-7-FG
GHP1A-D-11-FG
GHP1A-D-13-FG
GHP1A-D-16-FG
GHP1A-D-20-FG
GHP1-D-2-FG
GHP1-D-3-FG
GHP1-D-4-FG
GHP1-D-5-FG
GHP1-D-6-FG
GHP1-D-7-FG
GHP1-D-9-FG
GHP1-D-7-FG
GHP1-D-11-FG
GHP1-D-13-FG
GHP1-D-16-FG
GHP1-D-20-FG
GHP2A-D-6-FG
GHP2A-D-9-FG
GHP2A-D-10-FG
GHP2A-D-12-FG
GHP2A-D-13-FG
GHP2A-D-16-FG
GHP2A-D-20-FG
GHP2A-D-22-FG
GHP2A-D-25-FG
GHP2A-D-30-FG
GHP2A-D-34-FG
GHP2A-D-37-FG
GHP2A-D-40-FG
GHP2A-D-50-FG
GHP2-D-6-FG
GHP2-D-9-FG
GHP2-D-10-FG
GHP2-D-12-FG
GHP2-D-13-FG
GHP2-D-16-FG
GHP2-D-20-FG
GHP2-D-22-FG
GHP2-D-25-FG
GHP2-D-30-FG
GHP2-D-34-FG
GHP2-D-37-FG
GHP2-D-40-FG
GHP2-D-37-FG
GHP2-D-50-FG
GHP2-D-37-FG