Front Idler for Bulldozer Undercarriage Parts D3c D4d D5 D5b D5D Between the original electric shovel guide wheel and the shaft is sliding wear, mainly between the bushing in the guide wheel and the guide wheel shaft, and the guide wheel slider and the guide wheel shaft are fixed by pins to prevent the rotation of the guide wheel shaft. The adjusting gasket plays the role of adjusting the tightness of the track shoes, and the protective plate plays the role of protecting the lubricating oil pipe of the guide wheel shaft. Our products are according to the standard of OEM to manufacture.