Parker HPL Series Gear Pump | HPLPA206 HPLPA148 | High Pressure

Genlu Hydraulic proudly presents the HPL and its derivative series (HPLPA, HPLMA, HPLPT) high-pressure external gear pumps and motors, intricately engineered as heavy-duty core power units for mobile and industrial hydraulics. Fully complying with international mounting and performance standards set by top-tier brands like Parker, this comprehensive lineup covers core models such as the HPLPA114, HPLPA131, HPLPA148, HPLPA180, and highly specific engineering configurations like the HPLPA206SSPG6G4B00. Acting as the robust heart of fluid transmission systems, Genlu firmly guarantees 100% Drop-in Interchangeability for all SAE mounting flanges, port threads, drive shaft dimensions, and geometric displacements. Backed by our uncompromising 100% Simulation Load Testing, every single HPL gear pump is verified for volumetric efficiency, acoustic emissions, and high-peak pressure fatigue before leaving our facility, ensuring relentless and stable hydraulic power in the most demanding agricultural and construction environments.

Technical Specifications 

• Product Series: HPL (Base Series), HPLPA (High-Pressure Pump), HPLMA (High-Pressure Motor), HPLPT (Tandem / Specialty Flange variants)

• Representative Displacements: 11.4 cc/rev (HPLPA114), 13.1 cc/rev (HPLPA131), 14.8 cc/rev (HPLPA148), 18.0 cc/rev (HPLPA180), 20.6 cc/rev (HPLPA206)

• Rated Continuous Pressure: 250 bar to 280 bar (depending on displacement; smaller sizes accommodate higher continuous pressures)

• Max Intermittent Peak Pressure: Up to 300 bar

• Max Continuous Speed: 3000 rpm

• Min Operating Speed: 500 rpm (necessary to maintain an effective hydrodynamic lubrication film)

• Housing Materials: High-tensile extruded aluminum alloy body coupled with heavy-duty ductile cast iron end covers

• Control & Drive Mechanism: Fixed fluid displacement, driven mechanically via standard splined or parallel keyed shafts

• Weight: Approx. 4.5 kg to 6.0 kg (varies based on specific displacement and flange configuration)

Key Technical Advantages:

• Precision Gear Profile & Low Pulsation: The internal gear sets are manufactured using ultra-precise CNC micro-grinding processes. This optimized mesh geometry minimizes fluid trapping and pulsation, heavily reducing operational noise and dramatically improving operator comfort.

• Pressure-Compensated Floating Thrust Plates: Specialized bronze alloy thrust plates are fitted on both sides of the gear core. Pressurized system fluid actively forces these plates against the gear faces, dynamically adjusting axial clearances to maintain a volumetric efficiency above 93% even under continuous 280 bar loads.

• High-Pressure Shaft Seal Assembly: Equipped with premium imported double-lip shaft seals reinforced for high-pressure environments. Integrated with a dedicated internal drain channel, this architecture prevents seal blowout or lip inversion during sudden RPM surges or backpressure spikes.

• Lightweight & High Power Density: Combining the exceptional heat dissipation and lightweight characteristics of extruded aluminum with the structural integrity of cast iron covers. This compact footprint and low rotor inertia yield an outstanding power-to-weight ratio, making it ideal for high-efficiency mobile machinery.

Application Areas:

• Agricultural Machinery: Primary hydraulic power for large tractors, and header lift/steering circuits for combine harvesters.

• Construction & Earthmoving: Auxiliary implement circuits and pilot control systems for skid steer loaders and mini-excavators.

• Material Handling: Mast lifting systems and proportional steering circuits for high-capacity forklifts and aerial work platforms.

• Municipal & Specialty Vehicles: Rotary brush and fan drive systems for street sweepers, and high-pressure compaction circuits for refuse trucks.

Expert Maintenance Tips:

• Strict Suction Line Sizing: Gear pumps are extremely vulnerable to inlet restrictions (absolute pressure must remain above 0.8 bar). Ensure the suction line is generously sized and flawlessly sealed. Excessive vacuum will induce severe aeration, causing deafening noise and rapid destruction of the internal thrust plates.

• Initial Priming & Air Bleeding: Never start a newly installed pump at full speed under load. The pump casing must be pre-filled with clean hydraulic oil. Jog the prime mover several times with zero load to bleed trapped air from the circuit, preventing catastrophic dry-running bearing failure.

• Fluid Cleanliness Standards: Install return-line filtration with an absolute rating of 10μm or better. Maintaining system fluid cleanliness at ISO 4406 19/17/14 or superior will effectively double the lifespan of the precision gear faces and shaft seals.