GPC4-32 High Pressure Gear Pump Multistage GPC4 Series

Product Overview

The GPC4-32-2E1F3-G5-20-F-R (and related models such as GPC4-63/50/40/32/25/20/80-1E2F1-30L) is a high-pressure external gear pump from the GPC4 series, available in single or multistage (multiple) configurations. Featuring a high-strength aluminum alloy housing, axial flexible compensation and radial hydraulic balance, it delivers high volumetric efficiency, high pressure capability and long service life. Rated pressure reaches up to 25 MPa with a wide speed range. The pump offers direct bolt-on interchangeability with OEM units and undergoes 100% simulated duty testing for reliable performance in construction, mobile and lifting machinery hydraulic systems.

Technical Specifications 

• Models: GPC4-32-2E1F3-G5-20-F-R / GPC4-63/50/40/32/25/20/80-1E2F1-30L (GPC4 series)
• Pump type: High-pressure external gear pump (supports multistage configurations)
• 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 (smaller sizes); 20–23 MPa (medium); 18 MPa (largest)
• Rated speed: 2300–3300 r/min
• Minimum speed: 600–900 r/min
• Volumetric efficiency: ≥90%
• Weight (single pump examples): Approx. 8.3–10.7 kg (multiple units additive)
• Other: Aluminum alloy housing; SAE or Chinese standard flanges/shafts available; dual, triple or quadruple configurations supported

Key Technical Advantages

1. True drop-in interchangeability: Manufactured to OEM dimensional and porting standards for bolt-on replacement without modifications.
2. Axial flexible compensation and radial hydraulic balance: Effectively minimizes internal leakage and maintains high volumetric efficiency.
3. High-strength lightweight design: Aluminum alloy housing provides high pressure capability with low weight for mobile applications.
4. Flexible multistage configurations: Can be assembled as dual to quadruple pumps to meet complex system requirements.
5. 100% simulated duty testing: Full pressure, flow, noise and endurance verification before shipment ensures ready-to-install reliability.

Application Areas

• Construction machinery (loaders, excavators, etc.) hydraulic systems
• Mobile and lifting/transport equipment
• Dump trucks and crane main or auxiliary pumps
• Open-circuit systems requiring multistage high-pressure gear pumps
• Industrial hydraulic power units

Expert Maintenance Tips

• Confirm rotation direction and flange/shaft compatibility before installation; use recommended hydraulic oil and maintain cleanliness (filtration ≤25 μm).
• Start at low speed unloaded; check for leaks and noise. Observe load distribution on multistage units.
• Regularly inspect seals and bearings; ensure unrestricted suction lines to prevent cavitation.
• Keep oil temperature within –20 to +80 °C; recommended viscosity 20–43 mm²/s.
• For special multistage codes, verify the complete order code and consult technical support.

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