Product Overview The Rexroth A4VG45 hydraulic travel piston pump is a closed-circuit hydraulic power unit purpose-built for the travel system of the M315 wheeled excavator. It delivers high-pressure hydraulic oil to drive the travel motor, enabling machine movement with reliable, consistent performance. Built on a variable axial piston design, the pump combines precise flow control, wear-resistant alloy construction, and precision machining. It is a direct replacement unit