Isiqondiso sokuthuthukiswa: ukuthuthukiswa kanye nokukhiqizwa kwezingxenye ze-undercarriage zama-excavators aphakathi nendawo namakhulu.
Ukugxila ekuthuthukisweni: Sizibophezele ekukhiqizeni izingxenye ze-excavator undercarriage eziphakathi nendawo ezinkulu, bese sizoqhubeka nokuthuthukisa izingxenye ze-chassis zamamodeli we-excavator aphakathi nendawo, ukuthuthukisa ubuchwepheshe, imininingwane ephelele, futhi sihlangabezane nezidingo zamakhasimende ahlukene.Ukuhlinzeka amakhasimende ngekhwalithi ezinzile namanani aphansi aphakathi nendawo kanye nezingxenye ezinkulu ze-excavator undercarriage.
Esikhathini esizayo, u-Heli uzoqhubeka nokusebenza kanzima ukuze athuthukise, egxile ezingxenyeni zangaphansi ze-excavators eziphakathi nendawo ezinkulu --- "ezenziwe ku-Heli, izingxenye ezinkulu ze-undercarriage".