GPP Series High Pressure Gear Pump | GPP0-A0D35 GPP1-FOE80 | External Gear Pump

Chengyuan Hydraulic presents the GPP Series (including GPP0 and GPP1), a precision-engineered range of external gear pumps designed for high-pressure industrial and mobile applications. Specifically featuring models like GPP0-A0D35A20AR-111 and GPP1-FOE80A1L-11, this series follows strict engineering standards to serve as premium replacements for global leading brands. The GPP series is renowned for its compact design, impact resistance, and superior mechanical efficiency. We guarantee 100% Drop-in Interchangeability regarding SAE mounting flanges, shaft splines, and porting configurations. Every GPP pump undergoes Chengyuan’s rigorous 100% Simulation Load Testing, verifying volumetric efficiency under rated pressure and speed, ensuring maximum reliability for material handling, agricultural machinery, and power units.

Technical Specifications 

• Product Series: GPP0 / GPP1 Series

• Model Identification: GPP0-A0D35A20AR-111 / GPP1-FOE80A1L-11

• Displacement (GPP0-A0D35): 0.35 cm³/rev

• Displacement (GPP1-FOE80): 8.0 cm³/rev

• Rated Pressure: 21 MPa (210 Bar)

• Peak Pressure: 25 MPa (250 Bar)

• Rated Speed: 500 – 3500 r/min (Depending on size)

• Drive Shaft: Keyed shaft or A1 Splined shaft

• Control Logic: Fixed Displacement

• Materials: High-strength extruded aluminum body with cast iron covers

Key Technical Advantages:

• Pressure-Compensated Floating Bushings: The GPP series incorporates advanced floating bushing technology that provides automatic axial clearance compensation. This mechanism maintains a volumetric efficiency of over 90% even under continuous 21 MPa pressure, minimizing internal leakage.

• High-Hardness Nitrided Steel Gears: Gear pairs are manufactured from high-grade nitrided steel and finished through a precision shaving process. This ensures smooth engagement, extending the service life of the gears and significantly reducing mechanical noise at high speeds.

• PTFE-Coated Bearings: The internal support system utilizes DU bushings with PTFE coating, offering excellent self-lubricating properties and shock resistance. This design withstands high-frequency pulse loads and prevents scuffing due to lubrication failure.

• Heavy-Duty Extruded Body: The pump housing is crafted from high-density extruded aluminum with high yield strength. This prevents body deformation under high-pressure spikes, ensuring the long-term integrity of the internal clearances.

Application Areas:

• Mobile Machinery: Small forklift lift systems, loader steering assistance, and agricultural seeder drives.

• Industrial Equipment: Compact Hydraulic Power Units (HPUs), CNC machine tool chuck controls, and conveyor lines.

• Municipal Vehicles: Street sweeper brush lifting and snow plow control circuits.

Expert Maintenance Tips:

• Inlet Filtration Integrity: The GPP series is sensitive to particulate contamination. Ensure a suction filter of at least 25 microns or a return filter of 10 microns is installed to protect the gear engagement zones.

• Shaft Alignment Precision: During installation, maintain a coaxiality error between the pump and motor shaft of less than 0.05mm. Never use a hammer to force couplings onto the shaft, as this can damage internal thrust bearings and seals.

• Operating Temperature Monitoring: Keep the hydraulic oil temperature between 30°C and 80°C. Excessive heat reduces viscosity, which not only lowers efficiency but also accelerates seal aging and potential leakage.