Product Overview This swing motor assembly, with part numbers 542-7625 and 587-4961 , is the hydraulic drive unit specially designed for the E374 and E395GC excavator swing system. It converts hydraulic pressure into torque to drive the rotation of the upper structure. Featuring a high-torque piston structure, precise sealing design, wear-resistant alloy materials, and precision machining, it offers direct replacement installation and stable output performance for heavy-duty