The Kubota RC78821702 is a genuine OEM track roller assembly designed for various Kubota compact excavators. This essential undercarriage component ensures smooth track operation and proper tension, contributing to the overall performance and longevity of the machine. It is compatible with models such as the KX040-4, KX121-3, KX161-3, U35, U45, and U55 series. This part supersedes and replaces earlier Kubota part numbers RC78821700 and RC78821701, guaranteeing reliable fitment and optimal function for maintaining your excavator's mobility.