Rexroth A4VSO Hydraulic Piston Pump 28-140 cc/rev Displacement

The A4VSO is a swashplate-type axial piston variable pump designed for efficient hydrostatic drives in open circuits. Its notable features include excellent suction characteristics, low noise levels, long service life, high power-to-weight ratio, and a modular design. It offers a wide range of displacement sizes, from 40 to 1000 ml/rev, and can handle nominal pressures up to 350 bar with peak pressures reaching 400-420 bar.

These pumps are widely used in heavy-duty industrial applications such as ceramic presses, refractory material presses, steel and forging equipment, metallurgical machinery, mining machinery, marine machinery, petroleum equipment, engineering machinery, and machine tool control systems.

The series offers a comprehensive range of control types. The most common include DR/DRG for constant pressure control, LR for hyperbolic (constant) power control, and EO2 for electro-proportional control. Other options include manual (MA), hydraulic (HW, HM, HS, HD), and electronic (EM, EO) controls, providing flexibility for various system requirements.

The pump can be installed in various positions (horizontal or vertical). For vertical installation (shaft up), bearing flushing is recommended to lubricate the front bearing. The recommended optimal viscosity range for the hydraulic fluid is 16-36 mm²/s. Acceptable fluids include mineral oils and water-glycol, with a required cleanliness level of at least NAS 9级 (ISO 18/15). The operating temperature range is -25°C to +90°C.