As high-performance external gear pumps designed by Marzocchi, a leading Italian manufacturer in hydraulic components, the GHP1, GHP2, and GHP3 series are engineered to deliver exceptional reliability, efficiency, and durability in demanding hydraulic systems. Tailored to cover a wide range of displacement and pressure requirements, these pumps excel in both industrial and mobile applications, setting benchmarks for performance in their class.

Core Design & Structural Advantages

All GHP series pumps share a robust construction that combines precision engineering with high-quality materials, ensuring consistent performance even under heavy-duty conditions. The pump body is crafted from high-strength aluminum alloy via extrusion, while the flange and cover adopt spheroidal cast iron or die-cast aluminum alloy, minimizing deformation under continuous, intermittent, or peak high pressure.

The gear pairs are made of special alloy steel, undergoing case-hardening, quench hardening, precision grinding, and fine finishing processes to achieve a high surface finish and hardness of HRC 58-62. Optimized tooth profile design and geometric proportions effectively reduce pulsation and noise during operation, with noise levels ≤70 dB(A) measured at 1 meter under full load and 2000 rpm.

A key structural feature is the advanced bushing system: bushes are manufactured from low-friction, high-resistance aluminum alloy via die-casting, equipped with anti-friction bearings. Special symmetric compensation zones on the flange and cover, insulated by preformed seals with anti-extrusion rings, allow axial and radial movement proportional to operating pressure, significantly reducing internal leakage and ensuring excellent volumetric and mechanical efficiency.

Series-Specific Performance Parameters

GHP1 Series

Positioned as the compact solution for medium to small hydraulic systems, the GHP1 series offers a displacement range of 1.4 to 13.8 cm³/rev. It operates at a maximum working pressure of 250 bar (peak pressure up to 310 bar) and a rotational speed range of 500 to 3600 rpm. With a volumetric efficiency of up to 92%, this series is ideal for applications requiring precise flow control in limited installation space. The standard configuration features a G-type mechanical seal (temperature resistance up to 120℃, service life exceeding 5000 hours) and flange mounting (Type D) compatible with SAE/DIN standards.

GHP2 Series

As the second-generation optimized model, the GHP2 series enhances performance with improved gear tooth profiles, further reducing noise and pulsation. Its displacement ranges from 4.5 to 35.2 cm³/rev, with a maximum working pressure of 250 bar (peak pressure 310 bar) and a rotational speed range of 500 to 3600 rpm. This series offers flexible sealing options, including G-type mechanical seals, L-type lip seals, and M-type magnetic seals for zero-leakage requirements. With a volumetric efficiency of 92% and mechanical efficiency ≥87%, the GHP2 series balances versatility and performance, suitable for a wide spectrum of industrial and mobile applications.

GHP3 Series

Engineered for heavy-duty applications requiring high flow rates, the GHP3 series boasts a displacement range of 20 to 87 cm³/rev. It operates at a maximum working pressure of 250 bar (peak pressure 310 bar) and a rotational speed range of 500 to 3000 rpm. The reinforced construction, including spheroidal cast iron components, ensures durability under extreme working conditions. With a volumetric efficiency of up to 91%, this series delivers reliable hydraulic power for large-scale machinery. Standard accessories include a woodruff key, M14x1.5 hexagonal nut, and washer, facilitating easy installation and maintenance.

Applications & Compatibility

The GHP series pumps are widely utilized across multiple industries, including construction machinery (mini-excavators, forklift lifting mechanisms), agricultural machinery (tractor hydraulic steering systems, harvester conveyors), and industrial equipment (injection molding machines, stamping machine auxiliary power units). They are compatible with hydraulic oils of ISO VG 16-68 cSt (low-viscosity oils recommended for low-temperature environments) and require oil cleanliness of NAS 1638-9 or higher to ensure long service life.

Key Advantages

• High Efficiency: Volumetric efficiency up to 92% and mechanical efficiency ≥87% reduce energy consumption and operational costs.
• Durability: Heat-treated alloy steel gears and high-resistance seals ensure long service life even in harsh conditions.
• Flexibility: Multiple configurations (seal types, mounting methods, port directions) adapt to diverse system requirements.
• Low Noise: Optimized tooth profiles and compensation structures minimize operational noise, suitable for noise-sensitive environments.

Backed by Marzocchi’s decades of hydraulic expertise, the GHP1, GHP2, and GHP3 series gear pumps are trusted solutions for hydraulic systems requiring consistent performance, durability, and adaptability.