Product Overview
The GP3-0337R97F/20N is a fixed-displacement external gear pump from Italy’s DUPLOMATIC MS S.p.a. GP3 Series. DUPLOMATIC is a renowned European manufacturer of hydraulic components, and its GP Series gear pumps are widely recognized for high pressure capacity, low noise operation, and long service life, making them ideal for construction machinery, industrial hydraulic systems, and mobile equipment applications.
This unit belongs to the GP3 Series (the DUPLOMATIC GP Series comprises three frame sizes: GP1, GP2, and GP3, with displacements up to 9.1, 27.9, and 87.6 cm³/rev respectively). The GP3-0337R97F/20N delivers a displacement of 33.7 cm³/rev, a maximum operating pressure of 230 bar, and a flow rate of 50.5 L/min at 1500 rpm. The pump features axial clearance compensation to minimize internal leakage and maintain high volumetric efficiency under high-load conditions.
Key Interchangeability Advantage: Our GP3 series gear pumps are manufactured to strict Italian DUPLOMATIC original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces, flange dimensions, shaft configurations, and port positions are identical to the original product – no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions (covering rated pressure, peak pressure, and full speed range performance curves), guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on DUPLOMATIC GP Series designation rules):
GP3 = Series: Group 3 Fixed-Displacement External Gear Pump
0337 = Displacement code: 33.7 cm³/rev (code × 0.1)
R = Direction of rotation: Right-hand (clockwise)
97 = Shaft type / flange configuration code
F = Port type: Flange connection
20N = Seal and design code: NBR
Technical Specifications
GP3-0337R97F/20N
Product Series: DUPLOMATIC GP3 Series Fixed-Displacement External Gear Pump
Brand: DUPLOMATIC MS S.p.a. (Italy)
Displacement: 33.7 cm³/rev
Maximum Operating Pressure: 230 bar
Maximum Speed: 3000 rpm
Flow Rate (@1500 rpm): 50.5 L/min
Pump Type: Fixed-displacement (non-adjustable)
Configuration: Single pump
Direction of Rotation: Right-hand (R – clockwise)
Operating Temperature Range: -20°C to +50°C
Housing Material: Aluminum alloy (GP3 Series)
Bearing Type: Plain bearings with load balancing system
Seals: NBR
Mounting: Flange mounting
Port Connections: Flange type (F)
Recommended Fluid: Mineral hydraulic oil (HLP grade)
Key Technical Advantages
1. Axial Clearance Compensation for High Volumetric Efficiency
The GP3 Series gear pumps feature an axial clearance compensation system with pressure-balanced floating bushings that automatically adjust the clearance between gear faces and the housing. This design effectively minimizes internal leakage, ensuring high volumetric efficiency and stable flow output even under high-load conditions.
2. Optimized Gear Geometry for Low Noise Operation
The GP Series gear pumps utilize optimized gear tooth profiles and geometry, delivering low noise and low vibration operation. The low-noise characteristic significantly improves operator working conditions, making it particularly suitable for industrial and mobile equipment applications with strict noise requirements.
3. High-Strength Aluminum Housing for Lightweight High Power Density
The GP3 Series features a high-strength aluminum alloy housing that delivers substantial weight reduction while maintaining structural integrity. The lightweight design simplifies installation and reduces the load on host machinery – particularly critical for weight-sensitive mobile and vehicle-mounted applications.
4. Flexible Configuration and Multi-Pump Combination Capability
The GP Series gear pumps support multiple configuration options, including various mounting flanges, drive shaft types, and port connections. Pumps within the same series can be configured as single, tandem, or multiple-section assemblies, offering exceptional design flexibility for complex hydraulic systems.
5. Wide Displacement Coverage for Diverse Requirements
The DUPLOMATIC GP Series offers three frame sizes – GP1, GP2, and GP3 – with displacements covering up to 9.1, 27.9, and 87.6 cm³/rev respectively. The GP3 Series, which includes the GP3-0337R97F/20N, covers a wide displacement range from 26.4 to 87.6 cm³/rev, enabling precise matching to the flow requirements of various construction machinery and industrial hydraulic systems.
Application Areas
Construction Equipment: Excavators, wheel loaders, bulldozer hydraulic systems
Building Machinery: Concrete mixer trucks, pump trucks, road roller hydraulic systems
Material Handling Equipment: Forklifts, stackers, telehandler hydraulic systems
Agricultural Machinery: Tractors, combine harvesters, sprayer hydraulic systems
Industrial Hydraulic Systems: Presses, injection molding machines, machine tool hydraulic power units
Municipal and Special Vehicles: Sanitation vehicles, specialty utility vehicle hydraulic systems
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete GP3-0337R97F/20N model breakdown: GP3 (series), 0337 (33.7 cm³/rev displacement), R (right-hand rotation), 97 (shaft/flange configuration), F (flange ports), 20N (NBR seals).
Verify system operating pressure, flow requirements, and rotation direction during selection. For left-hand rotation, select GP3-0337L97F/20N.
The GP1/GP2/GP3 series cover different displacement ranges – select the correct frame size based on flow requirements.
2. Pre-Installation Checks
Confirm pump rotation is right-hand (R – clockwise) matches system drive direction.
Check mounting flange and drive shaft specifications for precise compatibility with system interface.
Never use hammer-driven installation – always use proper tools.
3. First Start-Up & Oil Priming
Prime the pump housing with clean hydraulic oil before first start-up; ensure suction line is fully filled – never run dry.
Recommended fluid: HLP mineral hydraulic oil per DIN 51524.
Maintain operating temperature within -20°C to +50°C.
Maximum speed must not exceed 3000 rpm.
4. Filtration & Fluid Cleanliness
5. Operating Monitoring
Maximum operating pressure must not exceed 230 bar.
If abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
