A3HM Series Yuken High Pressure Variable Displacement Piston Pumps
Product Overview
The A3HM Series is Yuken’s specialized open-circuit variable displacement piston pump designed specifically for construction machinery and mobile equipment. Engineered with European and North American mobile market requirements in mind, it delivers exceptional performance in a compact, lightweight package ideal for space-constrained vehicle applications.
Core Advantages
1. Compact & Lightweight Design
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Drastically reduced size and weight compared to conventional mobile pumps
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High power-to-mass ratio enables flexible installation in tight engine compartments
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Optimized for vehicle-mounted applications where weight and space are critical
2. High-Pressure Capability
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Rated pressure: 31.5 MPa (4569 PSI)
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Maximum pressure: 35 MPa (5080 PSI)
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Maintains stable performance under heavy shock loads common in construction work
3. High-Speed Compatibility
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Maximum shaft speed: Up to 3,400 r/min (A3HM18 model)
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Directly matches engine speeds without requiring additional reduction mechanisms
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Reduces transmission complexity and energy losses
4. Excellent Efficiency
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Volumetric efficiency: ≥95% at 35 MPa and 1800 r/min
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Overall efficiency: ≥90% under rated conditions
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Low energy consumption translates to better fuel economy for mobile equipment
Technical Specifications
Displacement Range (6 Models)
|
Model
|
Geometric Displacement (cm³/rev)
|
|
A3HM18
|
18.6
|
|
A3HM28
|
28.2
|
|
A3HM45
|
45.2
|
|
A3HM63
|
63.4
|
|
A3HM85
|
85.1
|
|
A3HM100
|
100.7
|
Source: Yuken official catalogs
Key Performance Parameters
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Control options: Pressure compensator, load sense, remote control, electro-hydraulic proportional control
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Mounting standards: ISO and SAE international standards
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Through-drive capability: Available for multi-pump configurations
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Fluid compatibility: Hydraulic oils meeting ISO VG 32-68 specifications
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Operating temperature range: -20°C to +80°C (with appropriate fluid selection)
Control Systems
The A3HM Series offers versatile control options to match diverse mobile application requirements:
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Basic Pressure Compensator (07 Control): Maintains constant pressure regardless of flow rate, ideal for load-holding applications
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Load Sense Control (14 Control): Adjusts output flow based on system demand, minimizing energy waste and improving efficiency
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Remote Pressure Control: Allows pressure adjustment from a remote location, enhancing operator convenience
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Electro-Hydraulic Proportional Control: Provides precise electronic control of pressure and flow for advanced machine automation
Typical Applications
Perfectly suited for mobile machinery operating in harsh environments:
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Construction equipment: Excavators, wheel loaders, backhoes, compactors
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Material handling: Forklifts, telehandlers, aerial work platforms
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Agricultural machinery: Tractors, harvesters, sprayers
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Specialty vehicles: Municipal service vehicles, forestry equipment
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Any mobile system requiring high pressure, high efficiency, and compact installation
Design Features
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Swash plate design: Ensures smooth, efficient operation with minimal noise
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Robust construction: High-strength materials withstand extreme operating conditions
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Integrated safety features: Overpressure protection, thermal relief, and contamination resistance
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Easy maintenance: Modular design allows quick component replacement
Model Nomenclature Example
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A3HM: Series designation (Mobile high-pressure variable piston pump)
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63: Displacement size (63.4 cm³/rev)
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FR09: Mounting and port configuration
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14: Control type (Load sense)
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A4K: Shaft and seal specifications
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10: Optional features
