swing bearing for excavators CAT330, CAT345, CAT365, CAT374, CAT385, CAT390, KOMATSU excavators, HITACHI, CASE, KOBELCO, CATERPILLAR, JCB excavators. ball slewing bearing, roller slewing bearing. Slewing bearing are used for applications of cranes, radar, excavators, solar tracer, ladle turret, wind power, wiring unit, stacker and reclaim, and other heavy duty rotary devices.