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A4FO28
Rexroth
A4FO28 Variable Displacement Axial Piston Pump – Intelligent Power for Demanding Systems
The A4FO28 is a compact and efficient variable displacement axial piston pump, designed for open-circuit hydraulic systems requiring intelligent power management and responsive control. Featuring a bent-axis design, it delivers high power density, precise flow regulation, and exceptional durability for a wide range of mobile and industrial applications.
Ideal Applications & Equipment:
This versatile variable pump is engineered to be the intelligent heart of systems where flow and power demands vary, including:
Mobile Machinery: Excavators, wheel loaders, telehandlers, and aerial work platforms requiring efficient implement and travel circuits.
Agricultural Equipment: Combine harvesters, forage harvesters, and tractors with demanding hydraulic functions.
Material Handling: Port cranes, reach stackers, and heavy-duty forklifts.
Industrial Systems: Test rigs, winch drives, and production machinery where variable speed or pressure control is critical.
Core Technologies & Advantages:
Efficient Bent-Axis Design: Utilizes a robust bent-axis principle with a fixed displacement. The variable flow is achieved through an integrated, electro-hydraulically or hydraulically controlled displacement changer, offering fast response and precise metering.
High Power Density & Efficiency: The compact design delivers a high power-to-weight ratio. Optimized fluid dynamics and minimized friction result in high volumetric and mechanical efficiency across the entire operating range, reducing energy consumption and heat generation.
Through-Drive Capability: The standard through-drive shaft allows for easy combination with other pumps (fixed or variable) or gearboxes to create complex, multi-circuit systems from a single power source, saving space and cost.
Advanced Control Options: Available with various proportional or pressure-controlled displacement changers (e.g., HD, HW, HS controls), enabling seamless integration into load-sensing (LS) or pressure-compensated systems for optimal machine performance and fuel economy.
Rugged Construction: Built with high-strength components and a heavy-duty bearing arrangement to ensure reliable operation under high continuous pressure and in challenging environments.
Engineered for Performance & Reliability:
The A4FO28 is designed for long service life and minimal downtime. Its robust construction offers high contamination resistance, while its modular design facilitates easy service and maintenance.
Key Specifications (Typical):
Displacement: 28 cm³/rev (Maximum)
Maximum Operating Pressure: Up to 350 bar (~5075 psi) continuous
Control Types: Electro-hydraulic proportional control, hydraulic pressure control, or manual servo control options available.