Product Overview This hydraulic swivel joint, identified by part numbers 618-7877, 545-0628, and 589-9800, is the central hydraulic distribution unit specially designed for the E395GC excavator hydraulic system. It transmits high-pressure hydraulic oil between the upper rotating body and the lower chassis to support travel and other hydraulic functions. Featuring a precision sealing structure, anti-wear alloy material, and precision machining, it offers direct replacement