Aftermarket 172B02-73910 Swivel Joint Seal Kit

This swivel joint seal kit is engineered to repair hydraulic fluid leaks in the center joint (swivel joint) of Yanmar VIO50 series mini excavators. The kit utilizes a composite seal design consisting of rubber rings and resin rings to achieve reliable sealing performance under high-pressure hydraulic circuits. The seal kit replaces OEM part numbers 172B02-73910, 172444-73880, and 172444-73802. It is compatible with Yanmar 4TNE88 and 4TNV88 series diesel engines. The kit addresses wear and leakage issues in the hydraulic swivel assembly, restoring circuit integrity and preventing contamination ingress. Installation requires standard hydraulic repair tooling and cleanliness protocols.