These are models of axial piston variable pumps from the A4VSO series, manufactured by Rexroth. They feature a swashplate design and are specifically engineered for use in open-circuit hydraulic systems. Their flow rate is proportional to both the input drive speed and the displacement volume, allowing for infinite variability of the output flow by adjusting the swashplate angle.

These pumps are recognized for their excellent suction characteristics, which contribute to high operational reliability. They operate at low noise levels and are designed for a long service life. Their modular design offers flexibility for various system integrations. Additional advantages include short response times and the capability for variable speed operation.

A4VSO series pumps are widely used across various industrial sectors. They are commonly found in heavy machinery, industrial hydraulic power units, and other applications requiring robust and efficient variable flow hydraulic power in an open-circuit configuration.