A7H Series Yuken High Pressure Variable Displacement Piston Pumps
The Yuken A7H Series is a line of high-pressure, large-displacement variable displacement piston pumps designed for demanding hydraulic applications requiring high power density and reliable performance. As an extension of Yuken’s renowned A3H series, these pumps deliver exceptional capabilities for heavy-duty industrial systems.
Core Specifications
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Parameter
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Value
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Rated Pressure
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35 MPa (350 kgf/cm²)
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Maximum Pressure
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40 MPa (400 kgf/cm²)
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Displacement Options
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A7H180: 180 cm³/rev A7H265: 270 cm³/rev (often referred to as A7H270)
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Pump Type
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Swash plate type variable displacement piston pump
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Fluid Compatibility
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Mineral oils, water-glycols, and polyol ester type fire-resistant fluids (under specific conditions)
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Mounting
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SAE standard mounting flange for easy integration
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Key Features
1. High Pressure & Large Volume Displacement
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Engineered for heavy-duty applications requiring high power output and large flow rates
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Maintains excellent volumetric efficiency even under maximum pressure conditions
2. Optional Through Drive
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Allows direct mounting of auxiliary or outboard pumps (SAE standard) without additional adapters
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Optimizes system space utilization and reduces installation complexity
3. Multiple Control Options
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Versatile control configurations to match diverse application requirements:
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Pressure compensator control (standard)
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Load sensing control
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Electro-hydraulic proportional control (pressure/flow)
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Power limiting control (torque limiting)
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Precise flow and pressure regulation for energy-efficient operation
4. Robust Design & Reliability
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Inherits the proven reliability of Yuken’s A3H series platform
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Heavy-duty construction with high-quality materials for extended service life
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Low noise operation compared to similar high-pressure pumps
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Minimal heat generation due to efficient design, reducing cooling system requirements
5. Flexible System Integration
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Can be used as single pumps or in 双联 configurations (tandem mounting)
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Compatible with various hydraulic system architectures
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Standardized interfaces for easy replacement and maintenance
Model Nomenclature (Example: A7H180-LR01SN-10)
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Code
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Meaning
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A7H
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Series designation (High pressure, large displacement)
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180
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Displacement (180 cm³/rev)
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L
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Mounting type (SAE standard)
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R
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Control type (e.g., R = pressure compensator)
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01
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Control option variation
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SN
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Shaft type and seal material
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10
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Specification code
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Typical Applications
The A7H Series is ideal for high-power hydraulic systems requiring precise control and reliable performance under extreme conditions:
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Heavy construction machinery (excavators, cranes, bulldozers)
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Industrial presses and forging equipment
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Injection molding machines
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Metal forming and processing machinery
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Marine hydraulic systems
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Mining and material handling equipment
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Test benches and high-pressure hydraulic power units
Operational Advantages
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Energy Efficiency: Variable displacement design adjusts output flow to match system demand, reducing power consumption and operating costs
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Precise Control: Multiple control options enable tailored performance for specific application requirements
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Reduced Maintenance: Robust construction and high-quality components minimize downtime and maintenance costs
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Space Optimization: Through drive option allows compact system design with multiple pump configurations
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Safety: Compatible with fire-resistant fluids for applications requiring enhanced safety measures
Important Considerations
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When using water-glycol fluids, slight oil leakage from the shaft seal may occur (criterion: 500ml / 6 months)
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Proper filtration (ISO 18/15) is essential for maintaining pump performance and longevity
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Follow recommended maintenance intervals and fluid change schedules
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Ensure correct alignment and mounting to prevent premature wear
For detailed technical specifications, installation guidelines, and maintenance procedures, refer to the official Yuken A7H Series documentation or contact authorized Yuken distributors.
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