HPLPA220 Series Internal Gear Pump | HPLPA114 HPLPA148 HPLPA180 | Servo Hydraulic Pump

The HPLPA Series from LIC Hydraulic is a premier line of High-Pressure Internal Gear Pumps specifically engineered for high-performance industrial applications. Models such as the HPLPA220SMNG6G4BHY are optimized for integration with servo-motor drives, providing a dynamic and energy-efficient power source. Known for their ultra-low noise levels and minimal pressure ripple, these pumps are the industry standard for precision molding and metal-forming machinery. We provide 100% drop-in replacements, ensuring total mechanical and functional compatibility with original SAE mounting and efficiency ratings.

Technical Highlights

• Displacements: $114, 131, 148, 180, 220\text{ cc/rev}$.

• Max Operating Pressure: Rated for continuous duty up to $315\text{–}350\text{ bar}$ ($4560\text{–}5075\text{ psi}$).

• Design: Internal gear with dual-gap axial and radial pressure compensation.

• Interface: Compliant with SAE 4-bolt and 2-bolt standard configurations.

Core Advantages

• High Volumetric Efficiency: The advanced compensation system automatically adjusts for clearances as internal pressure increases, ensuring peak flow delivery even under maximum load and varying temperatures.

• Whisper-Quiet Operation: The smooth, progressive meshing of the internal gears significantly reduces hydraulic turbulence and mechanical vibration, meeting the strictest noise emission regulations.

• Optimized for Servo Dynamics: Capable of handling rapid speed fluctuations and prolonged pressure-holding at zero-speed, the HPLPA series maximizes the energy-saving potential of modern servo-hydraulic circuits.

• Rugged Reliability: Constructed with high-strength cast-iron bodies and hardened gears, these pumps are built to withstand heavy-duty cycles in construction-grade or high-volume industrial environments.

Expert Maintenance Tips

• Initial Priming: Always fill the pump body with clean hydraulic oil before the first run. Running an HPLPA pump “dry” will cause immediate damage to the precision-ground side plates and gears.

• System Filtration: To maximize the life of the gap compensation components, maintain fluid cleanliness at ISO 18/16/13. Particle contamination is the primary cause of volumetric efficiency loss over time.

• Oil Temperature Control: Internal gear pumps are highly efficient, but for continuous high-pressure operation, ensure the hydraulic fluid remains within the $30\text{°C — 60°C}$ range to maintain optimal oil film thickness for the internal seals.

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