A4VG Series (Variable Displacement Axial Piston Pumps)

A4VG Series Hydraulic Pump | Closed Loop Drive for Mixer Trucks

Application: Concrete Mixer Truck Drum Drive System
System Type: Closed Circuit Axial Piston Pump

The Rexroth A4VG series is a variable displacement axial piston pump designed for closed-loop systems. It is one of the most common hydraulic pumps used for mixer truck drum rotation.

Key Features

• Closed-loop system with fast response

• Smooth forward and reverse rotation control

• Stable speed regulation under heavy load

• High efficiency and long service life

Typical Usage in Mixer Trucks

In concrete mixer trucks, the A4VG pump works together with a hydraulic motor and planetary gearbox to:

• Control drum rotation speed

• Switch between mixing and discharging directions

• Maintain stable torque at low speeds

Common Displacements

40 / 56 / 71 / 90 / 125

Keywords: Rexroth A4VG hydraulic pump, mixer truck hydraulic pump, closed loop piston pump, concrete mixer pump