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When LTZC Four point contact slewing bearing with outer tooth radial loads exceed a certain value there would be two points respectively for the contacting balls within the outer and inner raceway. Meanwhile, wear and friction moment would be in large order to overcome the axial force. The tilting moment and radial force loading in any kind of working conditions allow the contact angle to be adjusted accordingly.
Considerations in the design selection process
Frictional moment can vary within differing slewing bearing designs. In generally ball bearing designs perform better than roller element bearings, also single row bearings tend to perform better than multi-row bearings. Where bearings are designed with a cage then there are marked improvements in frictional movement performance.