Description:Cat® Gear and bearing provides support of the upper frame and transmits torque between the upper frame and car body allowing the top of the machine to rotate on the chassis. The Swing bearing, or slew ring is the rotating joint between the upper and lower frame of an excavator. It is an essential part of the machine as it allows 360° rotation of the top structure while the bottom structure remains stationary. They work as a system for your specific Cat machine and are tested and proven in the world's most severe applications. They give you maximum strength and resistance and result in a lower overall cost, outstanding strength and fatigue life, superior resistance to abrasive wear, and exceptional protection against slippage, even in high-load conditions. Cat® Parts are manufactured to precise specifications and are built for durability, reliability, productivity, and less environmental impact.Application:Consult your owner's manual or contact your local Cat® Dealer for more information.