The A7VO series axial piston variable pump represents a high-performance solution for open-circuit hydrostatic transmission systems, engineered to deliver reliable power and precise control across mobile and industrial applications. Distinguished by its bent-axis design with an axial tapered piston rotary group, this pump series combines compact dimensions with robust performance, making it suitable for both space-constrained machinery and heavy-duty equipment.

Available in a comprehensive range of displacement options—from 28 cm³ to 250 cm³ (including popular models like A7VO28, A7VO55, A7VO80, A7VO107, A7VO160, and A7VO250)—the series adapts to diverse flow and pressure requirements. It operates at a nominal pressure of 350 bar and a peak pressure of 400 bar, ensuring compatibility with high-power hydraulic systems while maintaining efficient energy transfer. A key advantage lies in its variable displacement capability: flow output is proportional to drive speed and displacement, and can be infinitely adjusted from maximum flow (qv max) down to zero (qv min = 0) by modifying the bent axis angle, allowing real-time alignment with dynamic system demands.

The pump’s structural design enhances durability and efficiency. Its spherical port plate and rotor assembly enable automatic centering during operation, reducing friction with low circumferential speeds and optimizing volumetric efficiency. A robust bearing system supports the drive shaft, enabling it to withstand radial loads while ensuring long service life—even under continuous high-pressure operation. Additionally, optional long-life bearings are available for extended durability in demanding environments, while optimized rotary group technology boosts overall efficiency by 3-5% compared to conventional hydraulic pumps, reducing energy consumption and operational costs.

To suit varied application needs, the A7VO series offers multiple control modes, including hydraulic control (HD), pressure control (DR), remote-adjustable pressure control (DRG), constant power control (LV), manual control (MA), and electric proportional control (EP) with 12V or 24V options. This flexibility allows integration into systems requiring precise pressure regulation, flow modulation, or remote operation. The pump is compatible with common hydraulic fluids such as mineral oil and fire-resistant HFD fluids (when paired with appropriate bearings), and operates reliably across a wide temperature range, adapting to harsh industrial and outdoor conditions.

Ideal for mobile machinery (compact excavators, concrete mixers, engineering vehicles) and stationary industrial equipment (metal forming presses, machine tools, mining machinery, marine systems), the A7VO series excels in high-pressure, high-flow scenarios where flow regulation is critical. Its compact design facilitates easy installation in equipment with limited space, while standardized mounting interfaces simplify integration into existing hydraulic power units.

For maintenance and replacement needs, the series offers interchangeable components and direct compatibility with reference part numbers such as R900990274 (e.g., model A7VO55HD1/63L-NZB01). This interchangeability minimizes downtime, ensuring rapid repairs and consistent system performance. Low noise operation, stable pressure control, and minimal maintenance requirements further enhance its practicality, making it a cost-effective choice for long-term industrial use.