Rexroth A4VSG250 High‑Power Variable Displacement Pump
Overview and key specifications
The Bosch Rexroth A4VSG250 is a rugged, high‑power swashplate‑type axial‑piston variable pump for closed‑circuit hydrostatic drives. It features a geometric displacement of 250 cm³/rev, a nominal pressure of 350 bar, and a maximum pressure of 400 bar. At n nom and Vg max, it delivers approximately 550 L/min and requires about 321 kW (Δp nom = 350 bar). Typical maximum speed at Vg max is around 2200 rpm, and approximate weight is 220 kg. These values make the A4VSG250 suitable for OEM construction machines and large‑scale industrial systems requiring high power density and reliable closed‑circuit performance.
Parameter | Value |
|---|---|
Displacement (Vg max) | 250 cm³/rev |
Nominal pressure (p nom) | 350 bar |
Maximum pressure (p max) | 400 bar |
Nominal speed (n nom) | 2200 rpm |
Flow at n nom, Vg max (qV nom) | 550 L/min |
Power at qV nom, Δp nom | 321 kW |
Approx. weight | 220 kg |
Features and benefits
Durable industrial design with long service life and low noise operation.
Through‑drive capability for mounting an additional pump of the same nominal size on the same shaft.
Smooth flow reversal through neutral via the swashplate; suitable for closed‑circuit systems.
High axial/radial load capacity on the drive shaft; modular system with visual swivel‑angle indicator and short control response time.
Supports HF fluids (performance derated).
Typical applications
Closed‑circuit hydrostatic drives in construction machinery and large industrial systems where high power, compact size, and reliability are critical.
OEM equipment requiring high power density and flexible integration.
Model code and ordering guidance
The A4VSG family uses a structured type code (e.g., size, control device, series suffix, mounting/through‑drive, and design variant). For example, an A4VSG250 may appear as A4VSG 250 HD1 /30R‑PPB10N009NE or A4VSG250EP2D1/32R‑NZD10F721S depending on control and options. Always match the complete type code to your machine’s parts list and the pump nameplate to ensure control compatibility and correct configuration.
Commissioning and maintenance notes
Pre‑fill and bleed the closed circuit; verify correct oil type/cleanliness and that the system is free of air.
Check and, if needed, adjust high‑pressure relief valves and any installed pressure cut‑off per machine specifications; ensure charge pump output, filters, and case drain are within limits.
Inspect shaft end play, coupling alignment, and through‑drive fit; verify all electrical connections for controlled variants.
After start‑up, recheck noise, vibration, and leakage, and confirm the swashplate angle indicator and control response match expected behavior.
