Description:Swing drive groups such as part # 584-2690 provide gear reduction between the swing motor and the swing gear, and a method of holding the upper portion of the machine stationary in respect to the lower portion of the machine. Attributes:Swing drive without motorHeavy Duty Swing Drives are designed to be rebuilt and reused.Application:374 ExcavatorConsult your owner's manual or contact your local Cat Dealer for more information.