The Evolution® range of quenched and tempered crawler shoes was developed by Bradken to overcome the shortfalls in traditional designs for the Caterpillar hydraulic excavator platforms.
Evolution crawler shoes have thickened pin lugs and feature Bradken's patented 'continuous roller path'. This roller path design enhancement improves the contact pressure distribution between the roller and the shoe. As a result, the roller is supported at all times as illustrated in the above diagram. This reduces metal flow in the shoe and increases the service life of mating components.