Product Overview
The GP1 series is a highly representative high-performance external gear pump product line from ARGO-HYTOS, comprising the GP1, GP2, and GP3 series. The GP1 series covers displacements from 0.8 to 11.8 cm³/rev, with maximum continuous operating pressure up to 280 bar and peak pressure up to 310 bar. The specific model GP1-0034R97F/20N features a displacement of 3.4 cm³/rev—a compact, highly efficient high-pressure gear pump widely used in machine tools, lifting equipment, automated production lines, and various industrial hydraulic systems.
As a professional hydraulic component manufacturer, we provide 100% interchangeable replacement solutions for the ARGO-HYTOS GP1 series. Every GP1 series gear pump undergoes 100% performance testing under simulated actual operating conditions—from displacement accuracy and pressure stability to volumetric efficiency—fully benchmarked against ARGO-HYTOS original equipment standards.
Model Code GP1-0034R97F/20N Breakdown:
GP1: Product series code (GP1 series gear pump)
0034: Displacement code, corresponding to 3.4 cm³/rev
R: Rotation direction — R = Clockwise (viewed from shaft end); L = Counter-clockwise
97F: Mounting flange type and shaft configuration code (4-bolt flange mounting)
20N: Seal configuration and special options code (NBR seals standard)
Technical Specifications
GP1-0034R97F/20N
Brand: ARGO-HYTOS
Series: GP1 High-Performance External Gear Pump
Theoretical Displacement: 3.4 cm³/rev
Rated Flow: Approx. 5.1 L/min (at 1,500 min⁻¹)
Continuous Operating Pressure (P2n): max 250 bar (3,600 PSI)
Intermittent Pressure (P2max): max 270 bar (3,915 PSI)
Peak Pressure (P3): max 280 bar (4,060 PSI)
Speed Range: 750–3,500 min⁻¹ (depending on displacement)
Maximum Speed (High-Performance Version): max 5,000 min⁻¹
Minimum Speed: 500 min⁻¹
Control Type: External gear pump, fixed displacement
Rotation Direction: R (Clockwise) / L (Counter-clockwise) optional
Mounting Type: 4-bolt flange mounting (SAE, ISO, DIN standards)
Housing Material: High-strength aluminum alloy
Seal Material: NBR (standard)
Volumetric Efficiency: 92%–98%
Mechanical Efficiency: 85%
Fluid Compatibility: HL/HLP hydraulic fluids
Viscosity Range: 16–200 mm²/s (cold start max 1,200 mm²/s)
Fluid Temperature Range (NBR seals): -25°C to +80°C
Protection Class: IP55 (with flange seal)
Service Life: 3,000 hours
Noise Level: Low noise across entire operating range
Weight: Approx. 1.8–2.5 kg (configuration dependent)
GP1 Series Full Displacement Range (15 variants)
GP1-0.8: 0.8 cm³/rev
GP1-1.2: 1.2 cm³/rev
GP1-1.6: 1.6 cm³/rev
GP1-2.1: 2.1 cm³/rev
GP1-2.5: 2.5 cm³/rev
GP1-3.3: 3.3 cm³/rev
GP1-3.6: 3.6 cm³/rev
GP1-4.4: 4.4 cm³/rev
GP1-4.8: 4.8 cm³/rev
GP1-5.8: 5.8 cm³/rev
GP1-6.2: 6.2 cm³/rev
GP1-7.0: 7.0 cm³/rev
GP1-7.9: 7.9 cm³/rev
GP1-10.0: 10.0 cm³/rev
GP1-11.8: 11.8 cm³/rev
GP2 / GP3 Series Reference Specifications
GP2 Series: Broader displacement range, continuous pressure 250 bar, peak 280 bar
GP3 Series: Larger displacements for high-flow applications
Speed Range: 750–3,500 min⁻¹
Important Note: The above specifications are compiled from ARGO-HYTOS official technical documentation and publicly available industry data. Different suffix codes represent different mounting flanges, shaft configurations, seal specifications, and rotation directions. Please refer to the product nameplate or technical agreement for exact specifications.
Key Technical Advantages
1. Axial Play Compensation Technology — Volumetric Efficiency Up to 98%
The GP1 series features axial play compensation, automatically compensating for clearance changes caused by wear and thermal expansion through precision fit between floating side plates and gear end faces. This design minimizes internal leakage, achieving volumetric efficiency of 92%–98% with stable flow and minimal pressure fluctuation, significantly reducing system energy consumption.
2. High-Strength Aluminum Alloy Housing — Lightweight with High Strength
The GP1 series pump body is manufactured from high-strength quality aluminum alloy, achieving significant weight reduction while maintaining structural rigidity and impact resistance. The flange, cover, and body are all high-quality aluminum die-castings—lightweight with excellent heat dissipation, particularly suitable for weight-sensitive mobile equipment and compact industrial applications.
3. Low Noise Across the Entire Operating Range
The GP1 series maintains low noise levels across the entire operating range. Optimized gear geometry and precision machining effectively suppress pressure pulsation and noise generation—ideal for noise-sensitive environments such as workshops, laboratories, and medical equipment applications.
4. High Reliability with Long Service Life
The GP1 series offers high operational reliability and long service life, with a design life of 3,000 hours. International standard flanges conform to SAE, ISO, and DIN specifications for easy installation and excellent interchangeability. Supports clockwise (R) or counter-clockwise (L) rotation to accommodate various drive motors.
5. Flexible Multiple Pump Configurations
The GP1 series supports multiple pump combinations—multiple gear pumps can be connected in series or parallel to meet complex system flow and pressure requirements, saving installation space and piping costs.
Application Areas
Machine Tool Hydraulic Systems: Hydraulic clamping and feed systems for CNC machines and machining centers
Lifting Equipment: Hydraulic lift platforms, scissor lifts
Automated Production Lines: Hydraulic power supply for various automation equipment
Injection Molding & Die-Casting Machines: Hydraulic systems for molding equipment
Construction Machinery: Hydraulic systems for mini excavators, loaders, and related equipment
Agricultural Machinery: Hydraulic systems for tractors and harvesters
Industrial Hydraulic Power Units: Various industrial hydraulic stations
Mobile Hydraulic Equipment: Forklifts, stackers, and other material handling equipment
Expert Maintenance Tips
1. Verify Rotation Direction
GP1 series pumps must only be operated in the specified rotation direction. In the model code, R = Clockwise (viewed from shaft end), L = Counter-clockwise. Always verify alignment with the drive motor’s rotation before installation. Reverse operation is strictly prohibited.
2. First Start-up and Priming
Ensure the pump cavity is fully primed with hydraulic fluid before first start-up. Never start the pump dry—this will cause severe wear or seizure of gears and bearings.
3. Fluid Cleanliness Requirements
Maintain fluid cleanliness to ISO 4406 standards. Install appropriately rated filters on the pump suction line and regularly inspect filter element condition. Compatible fluids are HL/HLP hydraulic oils with viscosity range 16–200 mm²/s (cold start max 1,200 mm²/s).
4. Speed and Pressure Limits
Continuous Operating Pressure: 250 bar
Intermittent Pressure: 270 bar
Peak Pressure: 280 bar — peak pressure is permitted for short-term transient conditions only
Speed Range: 750–3,500 min⁻¹ (depending on displacement)
Maximum Speed up to 5,000 min⁻¹
Never exceed rated speed or pressure limits
5. Temperature Monitoring
Fluid Temperature Range (NBR seals): -25°C to +80°C
Special seal materials (e.g., FKM) required outside this temperature range
6. Regular Inspection and Maintenance
Inspect the system filter element condition every 500 operating hours. Regularly monitor the pump for abnormal operating noise—if abnormal noise, excessive housing temperature rise, or system pressure drop is detected, shut down immediately for inspection. Service life is 3,000 hours.
