Izicathulo zethrekhi zinikeza inkundla yokusebenza yomshini.Izicathulo zethrekhi zingena phansi zinikeza umshini ukudonsa ukuhamba.Izicathulo zethrekhi zibaluleke kakhulu ekusebenzeni komshini kanye nempilo ende ye-undercarriage.Sinikeza izicathulo zethrekhi kuzo zonke izimo zangaphansi kwezinyawo futhi yakhelwe ngokukhethekile kokubili ama-dozers kanye nabavubukuli.