Parker WP Series Gear Pump | WP03B1B025R22NA124N | WP09A1V1 WP09A2B0

LIC Hydraulic’s WP Series high-pressure external gear pumps are engineered for performance and reliability in a compact package. This series, featuring the WP03 and the larger WP09 (A1V1, A2B0, A4B1) models, utilizes a high-strength extruded aluminum housing to provide an excellent power-to-weight ratio. Our 100% Drop-in Replacement for the WP03B1B025R22NA124N ensures precise compatibility with standard SAE mounting and shafting. With axial pressure compensation and precision-ground gears, these pumps maintain high volumetric efficiency even under continuous high-pressure conditions up to $250\text{ bar}$.

Technical Specifications (Quick Reference)

• Model Framework: WP03 (Small displacement) / WP09 (Medium displacement).

• Pressure Rating: Continuous up to $250\text{ bar}$ ($3625\text{ PSI}$).

• Speed Range: Efficient operation up to $4000\text{ RPM}$ (size dependent).

• Material: High-tensile aluminum alloy body with forged steel gears.

• Interchangeability: Full dimensional match for major OEM gear pump brands.

Key Technical Advantages

• Pressure-Balanced Design: Floating bushes automatically adjust to the gear faces based on operating pressure, minimizing internal leakage and maximizing efficiency throughout the pump’s life.

• Rugged DU Bearings: High-lead bronze bearings support the gear shafts, providing superior load-carrying capacity and resistance to fluid contamination.

• Exceptional Versatility: The WP09A series offers various porting (Side or Rear) and flange configurations (A1V1, A2B0, etc.), making it easy to integrate into existing hydraulic circuits.

• Efficient Cold Starts: The tight tolerances and quality materials ensure consistent suction and flow, even during cold-weather startups.

Application Areas

• Mobile Hydraulics: Steering and auxiliary circuits for tractors, mowers, and agricultural equipment.

• Material Handling: Primary pump for tail lifts, pallet jacks, and small forklifts.

• Industrial HPUs: Compact power units for garage lifts, log splitters, and small industrial presses.

Expert Maintenance Tips

• Rotation Verification: Always double-check the rotation (Clockwise “R” or Counter-Clockwise “L”) before installation. Running the pump in the wrong direction will flip the internal seals and lead to immediate failure.

• Filtration Integrity: Gear pumps are sensitive to hard particles. Maintain oil cleanliness to ISO 4406 19/17/14 to prevent scoring of the pressure plates and gear tips.

• Avoid Over-Speeding: Operating the WP09 series beyond its rated RPM can cause cavitation, resulting in the characteristic high-pitched “screaming” noise and rapid erosion of the aluminum body.

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