GPC4-32 High Pressure Gear Pump GPC4 Series Multiple

Product Overview

The GPC4 series (including GPC4-20/25/32/40/50/63/80 and multiple configurations such as GPC4-63/50/40/32/25/20/80-1E2F1-30L, GPC4-32-25-B6F4-30L, GPC4-40-1E1F3-G5-20) is a high-pressure external gear pump featuring axial flexible compensation and radial hydraulic balance. Constructed with high-strength aluminum alloy housing, high-load DU bearings and floating side plates, it delivers rated pressures up to 25 MPa with a wide speed range. Available as single or multi-stage units (up to four stages), the pumps are manufactured to OEM standards for direct interchangeability and undergo 100% simulated duty testing. They are widely used in construction, mobile and lifting machinery hydraulic systems.

Technical Specifications 

• Series models: GPC4-20 / GPC4-25 / GPC4-32 / GPC4-40 / GPC4-50 / GPC4-63 / GPC4-80 (and multiple combinations)
• Pump type: High-pressure external gear pump (single / double / triple / quadruple)
• Theoretical displacement examples:
  • GPC4-20: 21.0 ml/r
  • GPC4-25: 26.2 ml/r
  • GPC4-32: 32.8 ml/r
  • GPC4-40: 42.0 ml/r
  • GPC4-50: 52.5 ml/r
  • GPC4-63: 65.6 ml/r
  • GPC4-80: 78.7 ml/r
• Rated pressure: 25 MPa (GPC4-20/25/32/40); 23 MPa (GPC4-50); 20 MPa (GPC4-63); 18 MPa (GPC4-80)
• Nominal max speed: 3300 r/min (GPC4-20/25); 3150 r/min (GPC4-32); 3000 r/min (GPC4-40); 2700 r/min (GPC4-50); 2500 r/min (GPC4-63); 2300 r/min (GPC4-80)
• Minimum speed: 900 r/min (smaller sizes) to 600 r/min (larger sizes)
• Volumetric efficiency at rated condition: ≥90%
• Input power (rated condition examples): approx. 53.15 kW (GPC4-32); 64.81 kW (GPC4-40)
• Weight (single pump examples): approx. 8.3–11.5 kg (multiple units calculated by formula)
• Other: High-strength aluminum alloy housing, DU bearings, floating side plates; SAE and Chinese standard flanges/shafts/ports; operating oil temperature –20 to +80 °C

Key Technical Advantages

1. True drop-in interchangeability: Manufactured to OEM dimensional, flange and shaft standards for bolt-on replacement without modifications.
2. Axial flexible compensation & radial hydraulic balance: Automatic axial clearance compensation maintains high volumetric efficiency (≥90%) and minimizes internal leakage.
3. High-strength lightweight construction: Aluminum alloy housing with high-load DU bearings and floating side plates for high pressure, high speed and long service life.
4. Flexible multi-stage configuration: Up to four stages can be combined to meet complex multi-circuit system requirements.
5. 100% simulated duty testing: Full pressure, flow, noise and endurance verification before shipment ensures ready-to-install reliability.

Application Areas

• Construction and mobile machinery hydraulic systems
• Crane and excavator auxiliary circuits
• Dump trucks, loaders and lifting/transport equipment
• Industrial and mobile systems requiring high-pressure gear pumps
• Single or multiple-pump assemblies

Expert Maintenance Tips

• Confirm flange, shaft and rotation direction before installation; use recommended hydraulic oil (viscosity 20–43 mm²/s) and maintain proper cleanliness.
• Start at low speed unloaded; check for leaks and noise. For multi-stage units, ensure each stage load does not exceed specified limits.
• Regularly inspect seals and bearings; keep suction lines unrestricted to prevent cavitation.
• Keep oil temperature within –20 to +80 °C; avoid simultaneous maximum pressure and maximum speed.
• For multi-stage or special shaft/flange versions, verify the complete order code and consult technical support.