Cov khoom siv hauv qab muaj xws li cov menyuam taug kev, cov menyuam nqa cov menyuam, idler, sprocket thiab taug qab khau sib dhos. Raws li cov khoom tsim nyog rau kev ua haujlwm ntawm excavator, lawv txuas nrog rau kev ua haujlwm ntawm excavator thiab kev mus ncig. Thaum ua haujlwm rau txhua lub sijhawm, cov khoom no tau txais qee qhov kev hnav thiab tsim kua muag. Yog tias koj siv sijhawm ob peb feeb los ua kev saib xyuas txhua hnub ntawm cov khoom no, koj tuaj yeem txuas ntxiv lawv lub neej kev pabcuam. Koj paub dab tsi txog kev kho undercarriage?