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Slew Drive slewing drive / slewing ring / slewing bearing / slewing worm drive Slew drive mainly consists of a slewing bearing, a worm gear or spur gear, housing and a hydraulic or an electric motor. Slew drive is divided into worm gear driven type and spur gear driven type, and widely used for vehicle and crane steering systems, manlift systems for boom and basket rotation, light crane systems, rotation of attachments such as excavators, grabs and fork lifts, handling equipment (automation systems), loading and unloading devices, positioning systems / turntables.