Hydac PGE Series Gear Pump | PGE102 PGE103 PGE104 | External Hydraulic Gear Pump

The PGE Series external gear pumps from Chengyuan Hydraulic are lightweight power components designed for industrial automation, compact power units, and machine tool applications, offering full compatibility with Hydac standards. Featuring a high-precision aluminum alloy body and axial clearance compensation (pressure-balanced side plates), these pumps maintain superior volumetric efficiency even under continuous high-pressure loads. For core models PGE102, PGE103, and PGE104, we implement reinforced steel gear sets and specialized DU composite bushings. Every unit undergoes 100% simulated full-load testing to ensure performance and mounting parity with the OEM, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: PGE102 / PGE103 / PGE104

• Displacement Range: 1.0 $cm^3/rev$ to 28.0 $cm^3/rev$ (model dependent)

• Rated Operating Pressure: 250 bar (25 MPa)

• Peak Pressure: 280 bar (28 MPa)

• Speed Range: 500 – 4000 rpm (excellent high-speed stability)

• Body Material: High-tensile extruded aluminum alloy

• Seal Material: NBR standard, FKM available for high-temp environments

• Drive Shaft Options: Parallel Keyed, Splined, or 1:8 Tapered

• Mounting Flange: European 2-bolt / 4-bolt or SAE A standards

Key Technical Advantages:

• High-Pressure Axial Compensation: Floating side plates utilize hydraulic feedback to maintain contact with gear faces, minimizing internal leakage and sustaining volumetric efficiency over 93% even at 250 Bar.

• Low-Noise Gear Meshing: Precision-ground gears optimize the contact line and minimize fluid trapping. This results in a noise reduction of 3-5 dB(A) compared to standard pumps, ideal for indoor applications.

• Heavy-Duty DU Bushing Technology: Composite bushings offer exceptional resistance to radial loads and self-lubricating properties, effectively dampening vibrations and significantly extending the pump’s service life.

• Superior Power-to-Weight Ratio: The compact aluminum construction makes the PGE series highly space-efficient and lightweight, perfect for mobile machinery and integrated hydraulic manifolds.

Application Areas:

• Compact Hydraulic Power Units (HPU): Lift platforms and small hydraulic presses.

• Lubrication Systems: Forced lubrication circuits for heavy machinery.

• Machine Tools: Clamping fixtures and auxiliary control circuits.

• Municipal Vehicles: Sweeper brush drives and small snow plow circuits.

Expert Maintenance Tips:

• Pre-Priming for Start-up: To prevent dry-running friction during initial start-up, the pump housing must be pre-filled with clean hydraulic oil via the inlet or outlet port.

• Filtration Management: To protect the precision compensation plates, the system must be equipped with $10 \mu m$ absolute filtration, maintaining oil cleanliness at ISO 18/16/13 or better.

• Shaft Alignment: Ensure strict coaxiality between the pump and motor shaft, with a maximum error of 0.05mm, to prevent bushing wear and premature shaft seal leakage.