GHP1A-D-7-FG MARZOCCHI Gear Pump 5.2 cm³/rev 270 bar

Product Overview

The GHP series is a highly representative high-pressure external gear pump product line from MARZOCCHI—one of the world’s largest manufacturers of gear pumps and gear motors. The series comprises three groups—GHP1A, GHP2A, and GHP3A—with displacements covering a complete range from 1.4 cm³/rev to 87 cm³/rev. Models include GHP1A-D-7-FG, GHP1A-D-9-FG, GHP2A-D-6-FG, GHP2A-D-9-FG, GHP2A-D-50-FG, GHP3A-D-30-FG, and GHP3A-D-33-FG, widely used in construction machinery, agricultural machinery, hydraulic machine tools, injection molding machines, and other medium-to-high-pressure hydraulic systems.

As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the MARZOCCHI GHP series. Every GHP series gear pump undergoes 100% performance testing under simulated actual operating conditions—from displacement accuracy and pressure stability to volumetric efficiency—fully benchmarked against MARZOCCHI original equipment standards.

Model Code Explanation (using GHP1A-D-7-FG as an example):

• GHP: Product series—high-pressure external gear pump (fixed displacement)

• 1A: Size group—1A (GHP1, 2–20 cm³/rev); 2A (GHP2, 6–50 cm³/rev); 3A (GHP3, 20–87 cm³/rev)

• D: Mounting type—D = Flange mounting (SAE/DIN); S = Shaft mounting

• 7: Displacement level—corresponds to 5.2 cm³/rev theoretical displacement

• FG: Special options—F = Pressure relief valve; G = Mechanical seal

Technical Specifications

GHP Series General Pressure Parameters:

• GHP1: Max continuous 250 bar, max intermittent 275 bar, peak 290 bar

• GHP2: Max continuous 280 bar, max intermittent 295 bar, peak 310 bar

• GHP3: Max continuous 280 bar, max intermittent 295 bar, peak 310 bar

GHP1A-D-7-FG

• Brand: MARZOCCHI (Italy)

• Series: GHP1A High-Pressure External Gear Pump

• Theoretical Displacement: 5.2 cm³/rev

• Rated Flow: Approx. 7.4 L/min (@1,500 rpm)

• Maximum Continuous Pressure: 270 bar (3,915 PSI)

• Peak Pressure: 310 bar (4,495 PSI)

• Maximum Speed: 3,500 rpm

• Control Type: External gear pump, fixed displacement

• Rotation Direction: Clockwise (viewed from shaft) / Counter-clockwise optional

• Mounting Type: Flange mounting (SAE/DIN)

• Body Material: Special high-resistance extruded aluminum alloy

• Flange & Cover Material: Ductile cast iron

• Bearing System: Dual aluminum bushings supporting gear pair

• Seal Type: Mechanical seal (Type G)

• Volumetric Efficiency: ≥ 92%

• Noise Level: Low-noise design

• Weight: Approx. 2.1 kg

GHP1A-D-9-FG

• Theoretical Displacement: 6.2 cm³/rev

• Rated Flow: Approx. 8.8 L/min (@1,500 rpm)

• Maximum Continuous Pressure: 270 bar

• Peak Pressure: 310 bar

• Maximum Speed: 3,000 rpm

• Weight: Approx. 2.1 kg

GHP2A-D-6-FG

• Theoretical Displacement: Approx. 4.5 cm³/rev

• Rated Flow: Approx. 6.75 L/min (@1,500 rpm)

• Maximum Continuous Pressure: 210 bar

• Peak Pressure: 280 bar

• Maximum Speed: 3,600 rpm

• Recommended Speed Range: 500–3,000 rpm

GHP2A-D-9-FG

• Theoretical Displacement: 8.2 cm³/rev

• Rated Flow: Approx. 13.5 L/min (@1,500 rpm)

• Maximum Continuous Pressure: 280 bar

• Peak Pressure: 310 bar

• Maximum Speed: 4,000 rpm

• Volumetric Efficiency: ≥ 92%

GHP2A-D-50-FG

• Theoretical Displacement: 35.2 cm³/rev

• Maximum Continuous Pressure: 160 bar

• Maximum Speed: 1,800 rpm

GHP3A-D-30-FG

• Theoretical Displacement: 22 cm³/rev

• Rated Flow: Approx. 31 L/min (@1,500 rpm)

• Maximum Continuous Pressure: 280 bar

• Peak Pressure: 310 bar

• Maximum Speed: 3,500 rpm

GHP3A-D-33-FG

• Theoretical Displacement: 22 cm³/rev (same as GHP3A-D-30, different configuration)

• Maximum Continuous Pressure: 280 bar

• Peak Pressure: 310 bar

• Maximum Speed: 3,500 rpm

Important Note: The above specifications are compiled from MARZOCCHI official technical documentation and publicly available industry data. The number in the model code does not directly equal displacement (e.g., GHP1A-D-7 has a displacement of 5.2 cm³/rev). Please refer to the product nameplate or technical agreement for exact specifications.

Key Technical Advantages

1. High-Strength Composite Materials — Lightweight with High Strength

The GHP series pump body is manufactured from special high-resistance extruded aluminum alloy, while the flange and cover are made of ductile cast iron. This material combination achieves significant weight reduction while maintaining structural rigidity and impact resistance. The ductile cast iron covers resist deformation under high-pressure conditions, ensuring long-term stable operation.

2. Axial Clearance Auto-Compensation — High Efficiency Throughout Service Life

The GHP series features axial clearance auto-compensation, automatically compensating for clearance changes caused by wear and thermal expansion through precision fit between floating side plates and gear end faces. This design minimizes internal leakage, achieving volumetric efficiency of 92% or higher with stable performance throughout the entire service life.

3. Alloy Steel Nitrided Gears + Heavy-Duty Plain Bearings — Extended Service Life

Gears are manufactured from alloy steel with nitriding treatment, achieving tooth flank hardness of HRC 60+ for excellent wear resistance and impact strength. The bearing system utilizes heavy-duty plain bearings with hydraulic oil self-lubrication, offering low noise and high load capacity. The gear pair is supported by dual aluminum bushings, significantly extending pump service life.

4. Low Noise Across the Entire Operating Range

The GHP series maintains low noise levels across the entire operating range. Optimized gear design and precision machining effectively suppress pressure pulsation and noise generation. GHP2A series measured noise level is ≤ 68 dB(A) (at 1,500 rpm / 200 bar, 1 m distance).

5. Integrated Pressure Relief Valve — Comprehensive System Protection

FG suffix models feature an integrated pressure relief valve (safety valve) with adjustable cracking pressure for system protection. When system pressure exceeds the set value, the safety valve automatically opens to relieve pressure, effectively protecting the hydraulic system from overpressure damage.

6. Flexible Configuration Options and Multiple Pump Combinations

The GHP series offers rich configuration options—flange mounting (D) and shaft mounting (S), FG (mechanical seal) and EP (NBR seal) options. Multiple pump combinations (GHPA/GHPP series) are also available, providing different pressure/flow combinations driven by a single shaft to save installation space.

Application Areas

• Construction Machinery: Hydraulic systems for excavators, loaders, rollers, and related equipment

• Agricultural Machinery: Hydraulic systems for tractors, harvesters, and agricultural equipment

• Injection Molding Machinery: Hydraulic power supply for injection molding and die-casting machines

• Machine Tool Hydraulic Systems: Hydraulic clamping and feed systems for CNC machines and machining centers

• Industrial Hydraulic Power Units: Various industrial hydraulic stations

• Petrochemical Industry: Transfer of corrosive and high-viscosity liquid media

• Environmental Engineering: Fluid circulation and filtration in wastewater and exhaust gas treatment

• Pharmaceutical & Food Processing: Precise fluid transfer control

Expert Maintenance Tips

1. Verify Rotation Direction

GHP series pumps must only be operated in the specified rotation direction. Always verify that the rotation direction marked on the nameplate matches the drive motor’s rotation before installation. Reverse operation is strictly prohibited.

2. First Start-up and Priming

Ensure the pump cavity is fully primed with hydraulic fluid before first start-up. Never start the pump dry—this will cause severe wear or seizure of gears and bearings.

3. Fluid Cleanliness and Filtration

Install appropriately rated filters on the pump suction line and regularly inspect filter element condition. Compatible fluids include HL/HLP hydraulic oils; ensure fluid cleanliness meets system requirements.

4. Speed and Pressure Limits

• GHP1 Series: Continuous 250 bar, peak 290 bar, max speed 3,600 rpm

• GHP2 Series: Continuous 280 bar, peak 310 bar, max speed 3,500 rpm

• GHP3 Series: Continuous 280 bar, peak 310 bar, max speed 3,000 rpm

• Peak pressure is permitted for short-term transient conditions only (single occurrence < 10 minutes)

5. Suction Pressure Control

Insufficient suction pressure will cause cavitation, damaging internal pump components. Ensure suction lines are unobstructed and fluid viscosity is appropriate.

6. Regular Inspection and Maintenance

Regularly inspect the system filter element condition. Regularly monitor the pump for abnormal operating noise—if abnormal noise, excessive housing temperature rise, or system pressure drop is detected, shut down immediately for inspection. The GHP series features modular design for convenient maintenance with few wear parts.