Cat® Recoil Hydraulic Cylinder uses a large recoil spring and grease filled adjustment cylinder which allows the idler to move forward and back to maintain proper track tension as it absorbs undercarriage shock loads. Cat® Cylinders are configured to contain a quantity of hydraulic fluid. A rod element is coupled to the idler and configured to reciprocate within the recoil cylinder. The idler is configured to exert a force on the rod element to drive hydraulic fluid from the recoil cylinder when the force exceeds a predetermined force. Cat® Cylinders are manufactured with thick tube walls that enable more service lives.Application:Cat® Recoil Cylinders are used in undercarriage system front idler of Cat® Heavy duty equipment. Consult your owner's manual or contact your local Cat® Dealer for more information.