Permco HPLPA / HPLPB Hydraulic Gear Pump | HPLPA High Pressure Gear Pump Replacement

Genlu Hydraulic proudly introduces our HPLPA & HPLPB Series high-performance high-pressure gear pumps. This series is engineered as a seamless, direct-fit replacement for the classic Permco HPLPA/B series. Purpose-built for demanding mobile machinery and robust industrial power systems, these pumps are renowned for their exceptional pressure-bearing capacity, shock-load resilience, and long-term stability under heavy operational loads. Genlu guarantees 100% Drop-in Interchangeability in SAE mounting flanges, drive shaft profiles, and port geometries compared to the original Permco units. Every HPLPA/B pump is validated through 100% simulation testing to ensure peak volumetric efficiency under rated pressures, making it the definitive choice for your heavy-duty hydraulic system maintenance and upgrades.

Technical Specifications 

• Product Series: Permco HPLPA / HPLPB Series High-Pressure Gear Pump

• Key Configuration Models: HPLPA114HDDG3G3B00, HPLPA206SSPG6G4B00

• Displacement Range: 20 cc/rev to 150 cc/rev (model dependent)

• Rated Operating Pressure: 25 MPa (250 bar)

• Peak Pressure: 28 MPa (280 bar)

• Maximum Speed: 2500 rpm

• Control Mode: Fixed displacement gear transmission

• Mounting Interface: SAE Standard 2-bolt or 4-bolt flange

• Fluid Recommendation: Mineral hydraulic oil, ISO VG 46/68

Key Technical Advantages:

• Advanced Axial Pressure Compensation: Features precision-engineered floating bushing structures that automatically compensate for gear end-face clearances based on system pressure, significantly reducing internal leakage and maintaining high volumetric efficiency.

• Heavy-Duty Roller Bearings: Integrated high-capacity needle roller bearings minimize friction loss during high-pressure operation and enhance the pump’s resistance to radial loads, substantially extending shaft life.

• Optimized Gear Tooth Profile: Gears are machined from hardened alloy steel with optimized profiles to provide high contact-fatigue strength, reducing pressure pulsation and operational noise levels.

• Robust Ductile Iron Housing: Constructed from high-strength ductile iron, the housing is structurally reinforced to prevent deflection under high-pressure cycles, ensuring consistent internal seal integrity.

Application Areas:

• Heavy Mobile Machinery: Refuse truck compactors, dump truck lifting circuits, and heavy-duty loader power systems.

• Industrial Engineering Equipment: Power sources for high-pressure drilling rigs and hydraulic actuators in mining machinery.

• Specialized Vehicles: Crane outrigger drives and hydraulic systems for recovery and towing vehicles.

Expert Maintenance Tips:

• Monitor Inlet Vacuum: High-pressure pumps are sensitive to suction resistance. Ensure inlet lines are unobstructed and intake filters are adequately sized to prevent cavitation, which can cause severe pitting on gear tooth surfaces.

• Control Pressure Spikes: While the pump is designed for high-pressure tolerance, integrate reliable relief valves into your circuit to strictly cap peak pressure at 28 MPa, protecting the pump seals and internal structural integrity.

• Routine Fluid Analysis: To ensure the longevity of the floating bushings, perform regular fluid cleanliness testing. If contamination exceeds ISO 19/17/14, replace filters immediately to prevent fine particulates from scoring the bushing surfaces.