The integrated impeller and drive shaft unit bearing code K 71028 combines the rotating vane assembly and its driving connection into a single, precisely machined component. In the Sulzer ZV40/48’s oil pump, this design reduces alignment errors between shaft and vanes, ensuring smooth oil flow and consistent pressure build-up. Manufactured from hardened steel for high strength and wear resistance, the unit withstands the dynamic loads and high speeds of continuous engine operation, contributing directly to optimal lubrication performance.