Product Overview
The GPC4-25-1E2F1-30-L and GPC4-20-B6F1-30-L are high-pressure external gear pumps from the GPC4 series, manufactured under licensed technology from Vickers (USA) . The GPC4-25-1E2F1-30-L features a displacement of 26.2 cm³/rev, while the GPC4-20-B6F1-30-L delivers 21.0 cm³/rev. Both models are rated at 250 bar (25 MPa) .
The GPC4 series features a three-piece aluminum alloy extruded housing construction, with DU composite bearings pressed into both front and rear covers. Internally, pressure plates (floating side plates) provide axial clearance automatic compensation and radial pressure balance. This series offers simple structure, reliable operation, and is widely used in construction machinery, crane and transport equipment hydraulic systems.
Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability with genuine GPC4/Vickers series pumps without any system modifications. Each pump undergoes rigorous 100% simulated duty-cycle testing on dedicated test benches to validate pressure-flow-efficiency performance curves.
Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with original GPC4/Vickers series equipment. All Vickers brand names and model codes are referenced solely to indicate technical heritage and compatibility. This product is manufactured by an independent producer.
Technical Specifications
GPC4 Series General Specifications
Brand Series: Vickers-technology GPC4 Series High-Pressure Gear Pump
Product Type: Fixed Displacement External Gear Pump
Construction: Three-piece aluminum alloy extruded housing
Bearings: DU composite bearings (two in each cover)
Compensation: Axial clearance automatic compensation + radial pressure balance
Rated Pressure: 250 bar (25 MPa)
Hydraulic Fluid: 20–43 hydraulic oil
Operating Temperature: -20°C to +80°C
Recommended Filtration: ≤25 μm
Volumetric Efficiency: ≥ 90% (at rated conditions)
Maximum Contamination Level: ISO 4406 20/17
Multi-Pump Configuration: Single, tandem, triple, and quadruple combinations available
GPC4-25-1E2F1-30-L
Theoretical Displacement: 26.2 cm³/rev
Rated Pressure: 250 bar (25 MPa)
Maximum Speed: 3,300 rpm
Minimum Speed: 900 rpm
Rotation Direction: Left-hand (counterclockwise / -L)
Input Power (at rated conditions) : 45.6 kW
Weight: 8.6 – 9.1 kg
GPC4-20-B6F1-30-L
Theoretical Displacement: 21.0 cm³/rev
Rated Pressure: 250 bar (25 MPa)
Maximum Speed: 3,300 rpm
Minimum Speed: 900 rpm
Rotation Direction: Left-hand (counterclockwise / -L)
Input Power (at rated conditions) : 36.55 kW
Weight: 8.3 – 8.8 kg
GPC4 Series Additional Displacements Reference
GPC4-32: 32.8 cm³/rev, 250 bar, 3150 rpm max
GPC4-40: 42.0 cm³/rev, 250 bar, 3000 rpm max
GPC4-50: 52.5 cm³/rev, 230 bar, 2700 rpm max
GPC4-63: 65.6 cm³/rev, 200 bar, 2500 rpm max
GPC4-80: 78.7 cm³/rev, 180 bar, 2300 rpm max
Key Technical Advantages
1. Axial Clearance Compensation + Radial Pressure Balance – High Efficiency Across All Conditions
Internal pressure plates (floating side plates) provide axial clearance automatic compensation and radial pressure balance. Automatic adjustment of gear end clearance under high pressure significantly reduces internal leakage, maintaining ≥90% volumetric efficiency across the full pressure range.
2. DU Composite Bearings – High Load Capacity & Extended Service Life
DU composite bearings are pressed into both front and rear covers. DU material is the ideal bearing material for gear pumps, greatly extending pump service life. Combined with the high-strength aluminum alloy extruded housing, bearing load capacity and impact resistance are significantly enhanced.
3. Aluminum Alloy Extruded Housing – Lightweight Design
The high-strength aluminum alloy extruded housing delivers significant weight reduction compared to traditional cast iron equivalents (GPC4-20 weighs only 8.3 kg). Provides excellent pressure containment at 250 bar while reducing overall weight—ideal for mobile construction equipment.
4. High Speed & High Pressure – Superior Power Density
Rated pressure of 250 bar (25 MPa) with maximum speeds up to 3,300 rpm, and theoretical torque reaching 17–64 N·m. The GPC4-25 delivers 45.6 kW input power at rated conditions—superior power density for demanding applications such as cranes and dump trucks.
5. Modular Design – Flexible Multi-Section Expansion
Beyond single pumps, the GPC4 series supports tandem, triple, and quadruple pump configurations. Flexible combinations adapt to complex hydraulic systems requiring multiple independent flow circuits.
6. Multiple Interface Standards – 100% Drop-In Interchangeability
Available with various mounting flanges, shaft ends, and port connections conforming to SAE and Chinese national standards. Delivers 100% drop-in interchangeability with genuine GPC4/Vickers series pumps—install directly with zero system modifications.
7. 100% Simulated Duty-Cycle Testing
Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure (250 bar) and full speed range—ensuring zero-defect, plug-and-play performance upon installation.
Application Areas
Construction Equipment: Cranes, dump trucks, loader hydraulic systems
Crane & Transport Machinery: Forklifts, lift platform hydraulic systems
Mobile Machinery: Tractors, construction equipment hydraulic systems
Industrial Equipment: Presses, mining machinery hydraulic systems
Multi-Pump Applications: Systems requiring simultaneous independent hydraulic flow to multiple actuators
Expert Maintenance Tips
1. Fluid Cleanliness Control
Maintain system fluid cleanliness to ISO 4406 20/17 or better. Install a ≤25 μm absolute filtration filter upstream of the inlet port to prevent particle contamination from damaging precision gear pairs, DU composite bearings, and pressure plates.
2. Inlet Line Requirements
Keep suction lines short and straight with adequate diameter—not less than the port size. Recommended suction line flow velocity: ≤1.5 m/s to prevent cavitation from excessive inlet resistance. Inlet pressure must be maintained between 0.8 – 2.0 bar (absolute) .
3. Coupling Alignment Precision
Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended. If the drive involves sprockets or V-belt pulleys, an independent outboard bearing MUST be installed to protect pump shaft bearings.
4. First-Start Priming Procedure
Before initial startup, prime the pump by bleeding air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts with the outlet open (no load) until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.
5. Rotation Direction Confirmation
The “-L” suffix indicates left-hand (counterclockwise) rotation; “-R” indicates right-hand (clockwise). Always verify that the drive motor/engine rotation matches the pump before installation.
6. Viscosity & Temperature Monitoring
Recommended hydraulic fluid: 20–43 hydraulic oil. Operating temperature range: -20°C to +80°C. During cold starts when viscosity is high, ensure adequate suction conditions or preheat the fluid.
