GPC4 High Pressure Gear Pump | GPC4-25-1E2F1-30-L GPC4-20 GPC4-32 | Hydraulic External Gear Pump

LIC Hydraulic’s GPC4 Series High-Pressure External Gear Pumps are engineered as high-reliability power units for precision industrial hydraulic systems and mobile machinery. This series (including GPC4-20, GPC4-25, and GPC4-32) utilizes a high-tensile aluminum body combined with an advanced pressure compensation structure to deliver exceptional power density. As a premium replacement, all mounting flanges, shafts, and ports are designed for 100% Drop-in Interchangeability with OEM standards. Every GPC4 unit is subjected to 100% simulated load testing before delivery, ensuring maximum volumetric efficiency and minimal noise levels under continuous high-pressure operation.

Technical Specifications (Bulleted List)

• Model Series: GPC4 Series (e.g., GPC4-25-1E2F1-30-L)

• Displacement Range: 16.0 cm³/rev to 40.0 cm³/rev

• Nominal Pressure: 21 MPa (210 bar / 3045 PSI)

• Peak Pressure: 25 MPa (250 bar / 3625 PSI)

• Rated Speed: 1500 RPM – 3000 RPM

• Rotation: L (Counter-Clockwise) or R (Clockwise)

• Mounting Flange: Standard 2-Bolt or 4-Bolt patterns

• Shaft Options: Keyed or Splined shafts

• Body Material: High-tensile extruded aluminum alloy

Key Technical Advantages

• Axial Clearance Compensation: Features a floating bushing design that automatically adjusts axial clearances via system pressure, maintaining volumetric efficiency above 95% across varying pressure ranges.

• Heavy-Duty Bushing Technology: Equipped with specialized DU composite bushings, providing superior wear resistance and shock absorption. These bushings significantly extend bearing life compared to standard gear pumps, even under high-temperature conditions.

• Trapped Oil Relief Geometry: Precision-engineered relief grooves eliminate hydraulic trapping, smoothing flow ripples and dramatically reducing operational noise while lowering mechanical stress on the bearings.

• Premium Sealing Integrity: Critical seals are made from high-performance imported rubber, offering excellent aging resistance and high back-pressure capability, effectively preventing external leakage and premature shaft seal failure.

Application Areas

• Forklifts & Material Handling: Main lift system pumps and steering auxiliary pumps.

• Industrial Power Units: Auxiliary circuits for presses and compact Hydraulic Power Units (HPUs).

• Agricultural Machinery: Tractor hitch systems and harvester hydraulic circuits.

Expert Maintenance Tips

• Oil Cleanliness Control: We recommend maintaining hydraulic fluid to ISO 4406 18/16/13 standards. Clean oil is vital to prevent scoring on the gear end faces.

• Pre-Start Lubrication: After installation, fill the pump housing through the inlet with clean hydraulic oil and rotate the shaft manually to prevent dry-run damage during initial startup.

• Inlet Suction Inspection: Ensure the suction line is adequately sized and airtight. Excessive vacuum at the inlet can lead to cavitation, which severely reduces the pump’s service life.