G5 Series Hydraulic Gear Pump | G5-16 G5-25 G5-20 | Single & Tandem Pump

The G5 Series external gear pumps by Chengyuan Hydraulic are high-performance components engineered for full compatibility with global industrial standards. This series covers displacements including G5-16, G5-20, and G5-25, and supports flexible tandem configurations (e.g., tandem pump G5-25-A13R-23R). Designed for heavy-duty applications, the G5 series utilizes high-strength extruded aluminum bodies and floating bushing technology to maintain exceptional volumetric efficiency at continuous pressures of 25 MPa. As an ideal OEM replacement, every G5 pump offers 100% original-place interchangeability and undergoes 100% simulated condition testing, ensuring pressure response, noise control, and service life perfectly match OEM benchmarks.

Technical Specifications :

• Core Models: G5-16, G5-20, G5-25 (Single & Tandem configurations)

• Displacement Range: $16\text{ cc/rev}$ to $32\text{ cc/rev}$ (based on specifications)

• Rated Pressure: $20\text{ MPa (200 bar / 2900 psi)}$

• Peak Pressure: $25\text{ MPa (250 bar / 3625 psi)}$

• Speed Range: $500\text{ to } 3000\text{ rpm}$

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

• Shaft Options: A13 (Splined), 1E13 (Keyed or Specific Tang)

• Mounting: SAE Standard or 4-bolt rectangular flanges

• Volumetric Efficiency: $\ge 95\%$

Key Technical Advantages:

• Automatic Axial Pressure Compensation: Features floating bushings that use discharge pressure to automatically adjust lateral clearances. This compensation mechanism minimizes internal leakage, ensuring stable flow even under high-temperature and high-pressure conditions.

• High-Strength Three-Piece Construction: The pump body is extruded from specialized high-tenacity aluminum alloy, paired with precision-cast iron covers. This design provides superior resistance to pressure ripples and fatigue, preventing housing cracks or deformation under extreme loads.

• Precision-Ground Conjugate Gears: Manufactured from premium steel with advanced heat treatment and gear grinding, our gears exhibit extreme geometric precision. This reduces mechanical power loss and significantly lowers noise caused by pressure pulsations for smoother system operation.

• Flexible Tandem Capability: The G5 series supports multi-stage tandem configurations. Reinforced internal coupling allows the front pump to reliably transmit torque to the rear stages. Configurations like the G5-25-A13R-23R provide independent flow paths, significantly simplifying hydraulic plumbing in mobile machinery.

Application Areas:

• Forklifts & Material Handling: Primary power for lifting, tilting, and attachment circuits.

• Agricultural Machinery: Tractor hitch lift systems and harvester auxiliary hydraulic power.

• Construction Equipment: Core pump for pilot circuits in mini-excavators, loaders, and steering boosters.

Expert Maintenance Tips:

• Coupling Alignment: When installing the drive coupling, ensure an axial clearance of $0.5\text{–}1.0\text{ mm}$ is maintained. Never press-fit the shaft forcefully, as this will disrupt the pressure balance of the internal floating bushings and cause overheating.

• Fluid Cleanliness: The G5 series is sensitive to particulates. It is recommended to use return filters with a $20\mu\text{m}$ rating or better, maintaining oil cleanliness at or above ISO 19/17/14.

• Priming & Bleeding: Before the first start or after a major overhaul, bleed all air from the pump outlet. Run the pump at low speed with no load for 5 minutes to allow a lubricating oil film to form before applying full pressure.