Product Overview
The HGP-2AY-F6, HGP-2AY-F8R, HGP-2AY-F11R, and HGP-2AY-F12R series high-pressure gear pumps originate from Taiwan’s HYDROMAX HGP-2A Series external gear pump platform. HYDROMAX is a well-known Taiwanese manufacturer of hydraulic components, and its HGP Series gear pumps are recognized for high pressure, high-strength cast iron construction, and excellent wear resistance, making them ideal for hydraulic systems in various industrial machinery and mobile equipment.
The HGP-2A Series gear pumps and motors are available in 4 frame sizes with flow rates up to 108 L/min and pressures up to 250 bar. This series features high-strength cast iron housing, delivering 40% higher wear resistance compared to aluminum alternatives. Displacements cover 2 – 12 cc/rev with multiple flange, shaft, and port configuration options for flexible installation.
Key Interchangeability Advantage: Our HGP-2AY series gear pumps are manufactured to strict Taiwanese HYDROMAX original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces (JIS 4-bolt flange), 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 HYDROMAX HGP Series designation rules):
HGP = Series: High Pressure Gear Pump
2A = Size code: Group 2A (displacement 2 – 12 cc/rev)
Y = Mounting type: Flange mounting
F6 / F8 / F11 / F12 = Displacement code: 6 / 8 / 11 / 12 cc/rev respectively
R = Rotation direction: Right-hand (clockwise)
Technical Specifications
HGP-2AY Series – General Specifications
Product Series: HYDROMAX HGP-2A Series High-Pressure External Gear Pump
Brand: HYDROMAX (Taiwan)
Displacement Range: 2 – 12 cc/rev
Maximum Operating Pressure: 250 bar (3500 psi)
Rated Operating Pressure: 210 bar
Housing Material: High-strength cast iron
Gear Material: High-strength alloy steel, precision machined
Bearing Type: Plain bearings (pressure-balanced design)
Mounting Flange: JIS 4-bolt flange
Recommended Fluid: Mineral hydraulic oil
Operating Temperature Range: -20°C to +80°C
Direction of Rotation: Right-hand (R – clockwise) standard; left-hand optional
Mounting Position: Any
HGP-2AY-F6
Displacement: 6.0 cc/rev
Maximum Operating Pressure: 250 bar
Rated Operating Pressure: 210 bar
Direction of Rotation: Right-hand (clockwise)
HGP-2AY-F8R
Displacement: 8.0 cc/rev
Maximum Operating Pressure: 250 bar
Rated Operating Pressure: 210 bar
Direction of Rotation: Right-hand (clockwise)
HGP-2AY-F11R
Displacement: 11.0 cc/rev
Maximum Operating Pressure: 250 bar
Rated Operating Pressure: 210 bar
Direction of Rotation: Right-hand (clockwise)
HGP-2AY-F12R
Displacement: 12.0 cc/rev
Maximum Operating Pressure: 250 bar
Rated Operating Pressure: 210 bar
Direction of Rotation: Right-hand (clockwise)
Key Technical Advantages
1. High-Strength Cast Iron Housing for Superior Wear Resistance
The HGP-2AY Series features high-strength cast iron housing, delivering 40% higher wear resistance compared to aluminum alternatives and significantly extending service life in abrasive environments. The cast iron construction provides excellent impact resistance and structural rigidity to withstand high-frequency vibration and heavy shock loads – ideal for construction machinery and other demanding applications.
2. Pressure-Balanced Design for High Volumetric Efficiency and Long Service Life
Featuring pressure-balanced plain bearings, the design effectively minimizes internal leakage, maintaining high volumetric efficiency under high-load and high-pressure conditions. The pressure-balanced configuration ensures uniform bearing load distribution with minimal shaft loading, significantly extending product service life.
3. Standardized JIS Flange Mounting for Simple, Reliable Installation
The JIS 4-bolt flange standard mounting interface ensures fast, precise integration with various equipment. The standardized interface simplifies installation, reduces assembly time, and ensures reliable, stable mounting.
4. Wide Displacement Coverage and Flexible Configuration
The HGP-2AY Series offers displacements from 2 to 12 cc/rev (including F2/F3/F4/F5/F6/F8/F9/F10/F11/F12 specifications). Multiple shaft types (tangent key, straight, spline, taper), rotation directions (right-hand/left-hand), and port configurations (flange, G/BSP/PF, PT threads) are available for precise matching to diverse application requirements.
5. Compact Lightweight Design Saves Installation Space
The overall structure is compact with minimal installation space requirements. The gear meshing transmission delivers smooth, stable fluid transport. The compact design makes it particularly suitable for mobile equipment and industrial machinery with strict space constraints.
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, crane hydraulic systems
Agricultural Machinery: Tractors, combine harvesters, sprayer hydraulic systems
Industrial Hydraulic Systems: Presses, injection molding machines, machine tool hydraulic power units
Manufacturing Automation: Hydraulic drives for various automated production lines
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete HGP-2AY series model should include: Series (HGP-2A) + Mounting Type (Y) + Displacement Code (F6/F8/F11/F12) + Rotation Direction (R right-hand / L left-hand) .
Verify system operating pressure (≤ 250 bar), displacement requirements, and rotation direction during selection.
F6 indicates 6 cc/rev displacement, F8 indicates 8 cc/rev, F11 indicates 11 cc/rev, F12 indicates 12 cc/rev.
2. Pre-Installation Checks
HGP-2AY Series pumps have a fixed rotation direction (R = right-hand/clockwise) – verify matches system drive direction before installation.
Confirm mounting flange is JIS 4-bolt flange for precise compatibility with system interface.
Confirm shaft type (tangent key/straight/spline/taper) precisely matches coupling.
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: HM46 / HM68 anti-wear hydraulic oil.
Maintain operating temperature within -20°C to +80°C.
4. Filtration & Fluid Cleanliness
Maintain fluid cleanliness at NAS 1638 Class 9 or better.
Regularly monitor fluid cleanliness to prevent contaminants from accelerating gear and plain bearing wear.
Although cast iron housing offers excellent wear resistance, hard particles in the oil can still damage gears and bearings.
5. Operating Monitoring
Continuous operating pressure must not exceed 210 bar; peak pressure must not exceed 250 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.
