Product Overview The hydraulic piston motor assembly, part number 550-1473, is a hydraulic drive unit purpose-built for the hydraulic systems of M315 and M316 wheel excavators. It converts hydraulic pressure into torque to drive the relevant working assemblies of the machine. The assembly features a high-torque piston structure, precise sealing design, wear-resistant alloy materials, and precision machining. It is designed for direct replacement installation and delivers