GPA2 Double Gear Pump | GPA2-6-6 GPA2-10-10 GPA2-16-16 | Low Noise Hydraulic Pump

The GPA2 Series from LIC Hydraulic represents the premium standard in Internal Double Gear Pump technology. Engineered for high-pressure, low-noise industrial applications, the GPA2 range (including GPA2-6-6 and GPA2-16-16) provides two independent fluid circuits from a single drive source. These pumps are favored by manufacturers for their minimal flow ripple and exceptional service life. We provide 100% drop-in replacements, matching the original Japanese and European industrial standards for mounting, shafting, and porting.

Technical Highlights

• Frame Sizes: 6, 10, 16 ($6.0\text{–}16.0\text{ cc/rev}$ per section).

• Max Pressure: Rated up to $25\text{ MPa}$ ($250\text{ bar} / 3625\text{ psi}$).

• Type: Dual-Section Internal Gear Pump.

• Noise Level: Extremely low (typically $<65\text{ dB}$ at full load).

Core Advantages

• Ultra-Quiet Operation: The internal gearing mechanism ensures smoother meshing compared to external gear pumps, virtually eliminating the “whining” sound common in hydraulic power units.

• High Volumetric Efficiency: Utilizing radial and axial pressure compensation, the GPA2 series maintains high performance even as hydraulic temperatures rise, ensuring consistent machine speed.

• Minimized Pressure Ripples: Stable flow output reduces mechanical fatigue on hoses and valve seals, improving the overall reliability of the hydraulic circuit.

• Space-Efficient Integration: The twin-section design allows for a “High-Low” pump system or independent dual-circuit operation without the need for a tandem gearbox or multi-drive engine PTO.

Expert Maintenance Tips

• Fluid Cleanliness: Internal gear pumps have very fine tolerances between the internal and external gears. Maintain oil cleanliness at ISO 18/16/13 to prevent scoring and efficiency loss.

• Rotation Check: Always confirm the “R” (Clockwise) or “L” (Counter-clockwise) rotation before installation. Running an internal gear pump backward will cause immediate vacuum damage to the internal seals.

• Suction Line Integrity: Given the high-pressure capability, ensure the suction lines are perfectly sealed. Even a small air leak (aeration) will cause cavitation and destroy the precision-ground gear teeth within a short period.