Product Overview
The A3H180-FR01-KK-1 is a YUKEN A3H series high-pressure variable displacement piston pump of the single-stage pressure compensator type. With a geometric displacement of 180.7 cm³/rev, a rated working pressure of 28 MPa, and a maximum working pressure of 35 MPa, it is engineered for high-pressure, high-flow hydraulic systems. The A3H series encompasses seven displacement sizes from A3H16 to A3H180, covering a delivery volume range from 16.3 to 180.7 cm³/rev to meet the demands of hydraulic power units from small to extra-large scale.
Model code breakdown: A3H180 denotes the series and displacement (180.7 cm³/rev); F indicates flange-mount type; R indicates clockwise rotation (viewed from shaft end); 01 denotes pressure compensator control; KK denotes parallel key shaft (shaft diameter 76.2 mm / 3 inches); -1 is the design code.
Each unit is manufactured to exact YUKEN specifications, with mounting flange, drive shaft, port locations, and control interfaces fully dimensionally matched for drop-in interchangeability. Every pump undergoes 100% simulated load testing on our test bench, validating flow characteristics, pressure regulation accuracy, and operational stability across the full pressure range before shipment.
Technical Specifications
A3H180-FR01-KK-1 Core Specifications
Model: A3H180-FR01-KK-1
Series: YUKEN A3H Series
Geometric Displacement: 180.7 cm³/rev (approx. 11.03 in³/rev)
Minimum Adjustment Flow: 125.0 cm³/rev
Rated Pressure: 28 MPa (280 bar)
Maximum Working Pressure: 35 MPa (350 bar)
Pressure Adjustment Range: 5–35 MPa
Maximum Speed: 1800 min⁻¹ (at 0 kPa suction pressure)
Minimum Speed: 600 min⁻¹
Rotation Direction: Clockwise (viewed from shaft end, R)
Mounting Type: Flange-mount (F)
Control Type: Pressure Compensator (01)
Shaft End: Parallel key shaft, diameter 76.2 mm (3 inches) (KK)
Body Material: Cast iron
Weight (approx.): 70.4 kg (flange-mount type)
A3H Series Full Displacement Range
A3H16: 16.3 cm³/rev, rated pressure 28 MPa, max speed 3600 min⁻¹
A3H37: 37.1 cm³/rev, rated pressure 28 MPa, max speed 2700 min⁻¹
A3H56: 56.3 cm³/rev, rated pressure 28 MPa, max speed 2500 min⁻¹
A3H71: 70.7 cm³/rev, rated pressure 28 MPa, max speed 2300 min⁻¹
A3H100: 100.5 cm³/rev, rated pressure 28 MPa, max speed 2100 min⁻¹
A3H145: 145.2 cm³/rev, rated pressure 28 MPa, max speed 1800 min⁻¹
A3H180: 180.7 cm³/rev, rated pressure 28 MPa, max speed 1800 min⁻¹
Data referenced from YUKEN official technical documentation. At 35 MPa and 1800 min⁻¹, volumetric efficiency is 95% or above and overall efficiency is 90% or above.
Key Technical Advantages
1. Pressure Compensator Control for Energy-Efficient Operation
The A3H180-FR01-KK-1 features FR01 pressure compensator control. As system pressure approaches the preset cut-off pressure, the swashplate mechanism automatically reduces the tilt angle, decreasing displacement to only the flow required for system leakage compensation. This characteristic significantly reduces power consumption during holding-pressure conditions, effectively controlling oil temperature rise, making it ideal for injection molding machines, die-casting machines, and other systems requiring prolonged pressure holding.
2. Cast Iron Body with High Power Density and Compact Design
The pump body is constructed from high-strength cast iron, offering excellent compressive strength and thermal stability. The A3H series is renowned for its high output power-to-mass ratio, with the A3H180 flange-mount type weighing only approximately 70.4 kg while delivering 180.7 cm³/rev displacement in a compact installation footprint. The cast iron construction also provides favorable damping characteristics to reduce operational vibration.
3. High Volumetric Efficiency through Precision Machining
Piston-to-bore clearances are controlled through precision lapping, achieving volumetric efficiency of 95% or above and overall efficiency of 90% or above under rated conditions. The valve plate and cylinder block end faces are precision-machined to ensure stable oil film formation and sealing reliability under high-pressure conditions. The swashplate is supported by high-capacity bearings, minimizing control torque and maximizing response sensitivity.
4. Wide Displacement Range and Flexible Control Options
The A3H series offers seven standard displacements from A3H16 to A3H180, with control options including pressure compensator (FR01), constant power/torque control (FR09), and load sensing (FR14). The same displacement size can be configured with different control types to suit various OEM hydraulic system requirements for injection molding machines, die-casting machines, and construction machinery. Mounting flange, drive shaft, and port interfaces are highly common across the series, simplifying system integration and maintenance.
5. OEM Interchangeability and 100% Simulated Load Testing
The A3H180-FR01-KK-1 features mounting flange dimensions, drive shaft specifications (76.2 mm parallel key shaft), inlet/outlet port positions, and control interfaces fully matched to the original YUKEN pump, enabling direct replacement without piping or bracket modification. Every pump undergoes 100% simulated load testing on our test bench, validating flow characteristics, pressure regulation accuracy, and sealing integrity across the 28 MPa rated and 35 MPa peak pressure ranges, ensuring first-time pass on commissioning.
Application Areas
The A3H180-FR01-KK-1 and A3H series are widely deployed in the following machinery and systems:
Plastic Processing Equipment: Extra-large injection molding machine hydraulic power units, die-casting machine clamping and injection circuits
Metal Forming Equipment: Large hydraulic presses, forging press hydraulic systems
Construction Equipment: Mining excavator main hydraulic circuits, port crane hydraulic drives
Energy Equipment: Oil drilling rig hydraulic drive systems, wind turbine pitch control mechanisms
Marine & Offshore Engineering: High-pressure power sources for large anchor winches and windlasses
Metallurgical Equipment: Continuous casting machine withdrawal and straightening hydraulic systems, rolling mill hydraulic drives
Expert Maintenance Tips
Pre-Installation Checks:
Verify pump rotation direction is clockwise (viewed from shaft end, R). Reverse operation is not permitted.
Fill the pump housing with clean hydraulic oil (ISO VG32 or VG46) before installation to prevent dry-start damage to the valve plate and pistons.
Ensure the Filling Port is positioned upwards during installation to facilitate air evacuation from the pump housing.
Check drive shaft-to-coupling alignment. Use a flexible coupling; maximum permissible misalignment is less than 0.1 mm TIR and maximum permissible misangularity is less than 0.2°.
Hydraulic Fluid and Filtration:
Use ISO VG32 or VG46 anti-wear or R&O type hydraulic oil with a viscosity range of 20–400 cSt at 60°C.
Maintain system cleanliness within NAS Grade 10. The suction port must be equipped with at least a 100 μm (150 mesh) reservoir-type filter, and the return line must have a line-type filter of under 10 μm.
Replace all hydraulic fluid after the first 100 hours, then every 2000 hours or annually.
Operational Monitoring:
Suction pressure should be maintained between -0.16 and +0.5 kgf/cm². The pump suction port height should be within 1 meter from the oil level in the reservoir.
Pump case drain pressure should normally remain below 1 kgf/cm², with surge pressure not exceeding 5 kgf/cm². Drain piping length should be less than 1 meter and the pipe end submerged in oil.
Periodically verify the pressure compensator setting for drift. The adjusting screw is factory-set and must not be touched; if re-adjustment is necessary, record the original setting dimension.
Maintain oil temperature below 60°C. If exceeded, inspect the cooling system and circuit leakage.
