HPL HPG Series Multiple Aluminum Gear Pump | HPGPA336D21 | HPLPA114

LIC Hydraulic offers the HPL & HPG Series, a premier range of multiple aluminum gear pumps engineered for high-performance mobile applications. The standout feature of this series is its tandem/multiple stage capability, allowing one drive shaft to power multiple independent hydraulic circuits. Models like HPGPA336D21G7G6B00 (Group 3) and HPLPA114DDDG3G3B0 (Group 2) utilize high-strength extruded aluminum bodies combined with pressure-balanced bushings. These pumps deliver heavy-duty performance up to $250\text{ bar}$ ($3625\text{ PSI}$) while maintaining the lightweight profile necessary for modern vehicle efficiency.

Technical Specifications (Bulleted List)

• Series: HPL (Standard) / HPG (High Power).

• Configurations: Single, Double, Triple, and Quadruple stages.

• Max Pressure: Continuous up to $250\text{ bar}$, peak $280\text{ bar}$.

• Materials: High-tensile aluminum alloy with anti-friction coated bushings.

• Efficiency: Volumetric efficiency $\ge 92\%$ across the pressure range.

• Standard Mounting: SAE, European, and specialized agricultural flanges.

Key Technical Advantages

• Lightweight Modular Design: Aluminum construction significantly reduces the gross vehicle weight, improving fuel efficiency and payload capacity for mobile machinery.

• Customizable Multi-Stages: Engineers can mix and match displacements (e.g., combining a large Group 3 pump with a smaller Group 2 stage) to meet precise flow requirements for lift and steering.

• Advanced Axial Compensation: Floating bushings automatically adjust to gear face clearance, ensuring minimal internal leakage even at high operating temperatures.

• Low Pulsation: Precision-machined gears ensure smooth fluid delivery, reducing stress on downstream hoses and valves.

Application Areas

• Material Handling: Primary lift and auxiliary pumps for IC and electric forklifts.

• Municipal Vehicles: Powering the compaction and tilting systems of refuse trucks.

• Mobile Work Platforms: Providing the hydraulic logic and power for scissor and boom lifts.

Expert Maintenance Tips

• Shaft Alignment: For engine-driven applications, ensure the pump shaft is perfectly aligned with the PTO. Misalignment in multiple pumps can lead to premature failure of the intermediate coupling.

• Inlet Sizing: Because multiple pumps pull significant volumes of oil, ensure the suction line is not restricted. Starvation in any stage will cause rapid internal erosion of the aluminum housing.

• Fluid Cleanliness: To maintain the efficiency of the aluminum gear faces, keep oil cleanliness at $ISO\text{ 19/17/14}$ or better. Hard particles are the primary cause of internal “scoring” and pressure loss.