The wear of the excavator and bulldozer support wheel may cause damage to the chain, guide wheel and drive wheel. In the work of excavators and bulldozers, heavy wheels bear important loads and pressures, so wear and fatigue often occur. When the support wheel is heavily worn, it can lead to instability of the track chain, which in turn causes additional pressure and friction on the chain, guide wheel and drive wheel. -- Nan 'an excavator support heavy wheel