Hydraulic Pump A4VTG090 R902155546

This is a genuine Rexroth A4VTG090 axial piston variable pump, part number R902155546, built for closed-circuit hydrostatic drives, mainly for concrete mixer drum rotation. It’s a reliable, high-density power unit for mobile machinery.

Its swashplate design delivers infinite variable flow, proportional to speed and displacement. The pump shifts smoothly through zero stroke, reversing flow without shock. Rated pressure hits 40 MPa, peak up to 45 MPa, suited for heavy-duty cycles.

Two high-pressure relief valves protect the system from overload, also acting as boost feed valves. A built-in charge pump supplies makeup and control oil, with a relief valve capping boost pressure for stable performance.

It comes with premium bearings and Parker seals for long life and minimal leakage. Common control options include hydraulic HW1 and electric EP3/EP4 (12/24VDC), matching different mixer system needs.

This genuine R902155546 pump is a direct OEM replacement for mixer trucks. It meets Rexroth’s strict specs, ensuring easy installation, consistent output, and less downtime on job sites.