Parker PGP517 & PGP640 Hydraulic Gear Pump | High-Pressure Replacement

Genlu Hydraulic proudly introduces our precision-engineered PGP517 and PGP640 Series high-pressure external gear pumps, designed as the power heartbeat for heavy-duty industrial hydraulic systems and mobile machinery. This series serves as a precise match for Parker technical specifications, encompassing the entire PGP500 through PGP640 range, and fully compatible with complex engineering codes such as PGP517A0520CD1H3NP4P3B1B1 and PGP640A1000CD1H3NT6T5B1B1. Genlu unequivocally guarantees 100% Drop-in Interchangeability in mounting flanges, drive shafts, port configurations, and geometric displacements. Backed by our uncompromising 100% Simulation Load Testing, each gear pump is validated for volumetric efficiency, load pulsation, and continuous durability before dispatch, ensuring relentless, stable, and high-performance flow delivery in even the most demanding operating environments.

Technical Specifications 

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

• Representative Models: PGP517A0520CD1H3NP4P3B1B1, PGP640A1000CD1H3NT6T5B1B1

• Displacement Range: 20 cc/rev (PGP517) to 100 cc/rev (PGP640)

• Rated Continuous Pressure: 250 bar (3625 psi)

• Max Peak Pressure: 275 bar (4000 psi)

• Speed Range: 2500 – 3000 rpm (Model-dependent)

• Control Mode: Fixed displacement, mechanically driven

• Housing Material: Heavy-duty precision cast iron for superior rigidity and pressure resistance

Key Technical Advantages:

• Heavy-Duty Cast Iron Housing: Our housings are crafted from high-density precision cast iron. This material provides exceptional structural rigidity compared to aluminum alternatives, ensuring gear mesh clearances remain geometrically stable under long-term shock and vibration, fundamentally preventing stress-fatigue.

• Pressure-Balanced Floating Side Plates: Internally equipped with balanced floating side plates that dynamically adjust gear end-face clearances based on system pressure. This maintains ultra-high volumetric efficiency under peak loads, significantly reducing heat generation from internal leakage.

• Low-Pulsation Gear Profile: Optimized gear tooth mesh geometry and fluid channel design significantly smooth out flow output curves. This results in reduced hydraulic noise and high-frequency vibration, effectively protecting downstream execution components from pulsating shocks.

• Impact-Resistant Long-Life Bearings: Critical shaft support utilizes heavy-duty, impact-resistant bearing sets. This imparts exceptional radial load-bearing capacity, maintaining oil film integrity even during frequent load fluctuations and preventing metallic galling.

Application Areas:

• Construction Machinery: Implement circuits for excavators, bulldozers, and cranes.

• Material Handling: Lift systems for forklifts and hydraulic drives for port loading equipment.

• Industrial Power Stations: Primary power units for stationary presses, scrap shears, and machinery tools.

• Municipal Vehicles: Hydraulic power output for refuse compactors and cleaning equipment.

Expert Maintenance Tips:

• Suction Vacuum Monitoring: Cast iron gear pumps are highly sensitive to inlet flow restrictions. Ensure suction lines are unobstructed and keep absolute vacuum below 0.8 bar to prevent cavitation, which rapidly erodes gear end-faces.

• Coaxiality Verification: Because these pumps are built with heavy-duty tolerances, they are sensitive to installation alignment. Always verify that coupling coaxiality is maintained within 0.05 mm to prevent premature failure of the shaft and seals due to radial side-loads.

• Pre-fill Startup Protocol: Always pre-fill the pump casing with clean hydraulic fluid before installation. Jog the motor at low speed to bleed trapped air from the system before applying full operational load. Never operate the pump in a dry-start condition.