Cat® Swing Bearing Gear connects the upper house with the lower undercarriage and allows each to move separately and, in turn, for the house to spin freely of the undercarriage. Excavator swing bearings handle a forceful load that spreads out combinations of thrust and tilting loads. It is the essential part of the machine as it allows for 360 rotation. Cat® Parts are manufactured to precise specifications and are built for durability, reliability, productivity, less environmental impact and reuse.Application:Consult your owner's manual or contact your local Cat® Dealer for more information.