The A4VSO pump operates on the axial piston principle. It converts mechanical rotation into hydraulic flow by utilizing a rotating cylinder block containing pistons. These pistons reciprocate within their bores as they slide against a tilted swash plate. This reciprocating motion changes the volume of the sealed chambers, drawing in fluid during the expansion phase and pressurizing and expelling it during the compression phase, thereby achieving suction and discharge.

Key advantages include high rated pressure (up to 350 bar, peak 400 bar), compact structure, high efficiency, convenient flow regulation, excellent suction characteristics, low noise levels, long service life, and a wide range of control options (e.g., pressure, flow, power).

• Foundation: The base mount or flange mount must be rigid.
• Alignment: Precise alignment between the drive motor shaft and the pump shaft is crucial. The maximum allowable misalignment is < 0.05mm.
• Shaft Loading: Avoid installing pulleys, chains, or gears directly on the pump shaft, as this imposes radial loads which the pump is not designed to handle.
• Reservoir Mounting: If mounted on the reservoir, the pump's centerline should ideally not be more than 500 mm above the oil surface to facilitate good suction conditions and avoid cavitation.
• Filling: Before initial start-up, the pump casing must be filled with hydraulic oil through the designated filling port (e.g., port 'T', 'K1', 'K2', or 'RL' depending on orientation).