GR Series Hydraulic Gear Pump | GR20 GR45 GR80 High Pressure Gear Pump Replacement

Genlu Hydraulic proudly introduces our GR Series (covering 20 to 80 cc/rev displacements) high-performance high-pressure gear pumps. This series is engineered for versatility and power, making it a perfect fit for construction machinery, agricultural equipment, and industrial hydraulic power units. Known for exceptional volumetric efficiency, superior pressure-shock resilience, and low-noise operation, the GR series utilizes precision-machined floating bush compensation to maintain tight tolerances even under full pressure. Genlu guarantees 100% Drop-in Interchangeability in mounting dimensions, shaft profiles, and port layouts compared to the original GR series units. Each gear pump is validated through 100% simulation testing to ensure a reliable and pulsation-free flow for your hydraulic system.

Technical Specifications 

• Product Series: GR Series High-Pressure External Gear Pump

• Key Configuration Model: GR45-SMT16B-180LAC28B5 (High-Pressure Helical Gear Series)

• Displacement Range: 20cc/rev to 80cc/rev

• Rated Operating Pressure: 25 MPa (250 bar)

• Peak Pressure: 28 MPa (280 bar)

• Max Operating Speed: Up to 3000 rpm (model dependent)

• Control Mode: Fixed Displacement

• Rotation: Clockwise (R) or Counter-Clockwise (L)

• Mounting Interface: Industrial Standard Flange (SAE/ISO)

Key Technical Advantages:

• Helical Gear Engineering: Incorporating helical gear profiles significantly reduces engagement pressure pulsations, leading to quieter operation and lower vibration impact on shaft bearings.

• Floating Bush Compensation: Advanced axial clearance compensation automatically adjusts end-plate gaps based on system pressure, minimizing internal leakage and maximizing volumetric efficiency under heavy loads.

• High-Rigidity Housing: Precision-cast and treated for maximum structural integrity, the housing resists deformation under continuous high-pressure cyclic loading.

• Premium Sealing System: Utilizing high-performance Viton seals, our pumps maintain excellent anti-leakage integrity even in demanding, high-temperature industrial environments.

Application Areas:

• Construction Machinery: Hydraulic systems for forklifts, mini-excavator auxiliary circuits, and loader power units.

• Agricultural & Specialty Vehicles: Tractor linkage systems and harvester implement actuators.

• Industrial Equipment: Auxiliary circuits for injection molding machines, hydraulic elevators, and industrial clamping units.

Expert Maintenance Tips:

• Fluid Cleanliness Standards: Gear pumps are highly sensitive to particulate contamination. Always install a filter at the suction inlet rated at ≤25µm to prevent scoring in the gear mesh zone.

• Prevent Cavitation: Maintain airtight suction connections to prevent air ingress. Ensure suction fluid velocity remains within the recommended range (0.5-1.5 m/s) to avoid excessive vacuum-induced cavitation.

• Cold-Start Protocol: In sub-zero temperatures, perform a few minutes of low-pressure no-load operation upon start-up to ensure that gear components receive sufficient lubrication.