Thaum ua hauj lwm hauv dej, xyuam xim rau qhov tso cai dej qhov tob ntawm qhovmicro excavatosr (qhov dej saum npoo yuav tsum nyob hauv qab ntawm qhov nruab nrab ntawm qhov txhawb nqa sprocket); Yog hais tias cov dej theem siab, sab hauv ntawm lub nplhaib slewing yuav tsis zoo lubricated vim cov dej nkag, thiab lub cav kiv cua yuav tawg vim muaj kev cuam tshuam dej. Kev puas tsuaj, hluav taws xob Circuit Court luv luv lossis qhib Circuit Court vim muaj dej nkag.
