Rexroth A4VG125 Pump Axial Piston Variable Pump

Bosch Rexroth A4VG125 hydraulic plunger pump front view
A4VG125 swashplate and control valve detail view

Description:

The Rexroth A4VG125 pump is a high-performance axial piston variable pump designed for closed-circuit hydrostatic transmissions. Engineered for reliability and precise control, it delivers stable flow, fast response, and excellent efficiency across demanding mobile and industrial applications. The A4VG125 supports a variety of control options, high-pressure operation, and compact installation, making it a preferred choice for excavators, wheel loaders, drilling equipment, and hydraulic drives.

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Key Features of Rexroth A4VG125 Axial Piston Variable Pump

  • Variable displacement: Flow rate and direction can be smoothly varied via swash‑plate control.

  • Dual integrated pressure‑relief (boost) valves to protect against overload and regulate boost/charge pressure.

  • Integrated boost (charge) pump for pilot oil supply and control oil, eliminating the need for a separate feed pump.

  • Robust construction: Hardened pistons, high‑strength cylinder block, and sturdy bearings — built to withstand high radial and axial loads, ensuring durability in heavy‑duty continuous operation.

  • Wide range of control and regulation options: Hydraulic, mechanical, or electronic (proportional) control variants available to suit different systems.

 

Parameter Value
Maximum displacement (Vg max) 125 cm³/rev
Nominal (continuous) pressure 400 bar
Maximum (peak) pressure 450 bar (some sources refer to up to 500 bar depending on configuration)
Maximum continuous speed (at Vg max) ≈ 2850 rpm
Maximum flow (at Vg max and nominal speed) ~356 L/min
Approximate weight ~80 kg (varies by variant)
Circuit type Closed‑circuit hydrostatic transmission
Fluid type Mineral‑oil based hydraulic fluid (hydraulic oil)
Control options Hydraulic, mechanical servo, electronic/proportional control — many variants available (e.g. NV, HD3, HW, DG, DA1, DA2, EP3, EP4, EZ1, EZ2 etc.)