Yuken A3H Series Piston Pump | A3H56 A3H71 A3H100 | High Pressure Hydraulic Pump

The A3H Series variable displacement axial piston pumps by Chengyuan Hydraulic are heavy-duty power components fully compatible with Yuken industrial standards. This range features core models such as A3H56-LR14K-10, A3H71-FR14K-10, and A3H100-FR14K-10. The A3H series is renowned for its 35 MPa peak pressure and exceptional volumetric efficiency. Its compact housing integrates advanced pressure compensation and constant power control logic. As a signature Chengyuan product, every A3H pump undergoes 100% simulated full-load testing to ensure 100% original-place interchangeability regarding flow response and mounting dimensions.

Technical Specifications :

• Core Models: A3H37, A3H56, A3H71, A3H100, A3H145, A3H180

• Rated Operating Pressure: $31.5\text{ MPa (315 bar / 4500 psi)}$

• Peak Pressure: $35\text{ MPa (350 bar / 5000 psi)}$

• Control Types: LR (Pressure Compensator), FR (Load Sensing)

• Design Number: 10 (Flange Mounting)

• Rotation Direction: R (Right/CW), L (Left/CCW)

• Max Speed Range: $1800\text{–}3600\text{ r/min}$ (depending on displacement)

• Material: High-tensile cast iron body with reinforced wear-resistant valve plates

Key Technical Advantages:

• Ultra-High Pressure Capability: The A3H series features a thickened housing and reinforced plunger assemblies, maintaining a steady $31.5\text{ MPa}$ rating. This allows systems to generate higher forces with smaller cylinder diameters, reducing the overall footprint of hydraulic power units.

• Superior Volumetric Efficiency: Utilizing precision-lapped valve plates and cylinder block interfaces, Chengyuan A3H pumps maintain overall efficiency above $90\%$ at rated pressure. This high efficiency minimizes heat generation and reduces the load on cooling systems.

• Low-Noise Silent Technology: To address the noise common in high-pressure pumps, the A3H incorporates pre-compression volume designs that dampen pressure pulsations during plunger transition. This results in noise levels significantly lower than comparable industrial pumps even at high speeds.

• Fast-Response Control Logic: Integrated LR/FR control mechanisms adjust displacement within milliseconds. The transition from full flow to zero flow is exceptionally smooth, preventing shock vibrations during system unloading.

Application Areas:

• Metal Forming Machinery: Shearing machines, press brakes, and high-pressure hydraulic presses.

• Injection Molding: Meeting the demands for high-pressure holding and rapid cycles in modern plastic machinery.

• Heavy Industrial Equipment: Metallurgical equipment, forging machinery, and marine steering systems.

Expert Maintenance Tips:

• Fluid Cleanliness: High-pressure pumps are extremely sensitive to particulates. We recommend a $10\mu\text{m}$ return filter with a clogging indicator, maintaining oil contamination levels strictly within NAS Class 9.

• Case Drain Connection: The case drain port must be piped directly back to the tank, and the highest point of the line should be above the pump body. Never merge the drain line with other return lines to prevent case overpressure and shaft seal failure.

• Pre-Filling Before Startup: Before the initial start, the pump case must be filled with hydraulic oil via the top fill port. NEVER run the pump dry, as this will lead to instantaneous seizing of the piston shoes and swashplate.