Abstract: A hydromechanical track adjusting and recoil apparatus for use with crawler vehicles and the like. The apparatus automatically adjusts the tension in the track of the vehicle by means of momentary mechanical recoil and hydraulic damper for preventing breaking of an endless track chain and associated elements. The track tension is maintained by adjustment of an idler wheel which is connected to one end of the adjusting and recoil apparatus by the interposition of a reciprocably mounted bearing member for rotatably supporting the idler. The other end of the adjusting and recoil apparatus is fixedly connected to a track frame. The apparatus utilizes recoil springs for accumulating transient force energy and automatically returning the apparatus to the original responsive operating condition in cooperation with a hydraulic damper device.