2 Txheeb xyuas qhov hnav ntawm cov hlua rub thiab cov npoo, seb txoj hlua hlua thiab qhov sib tw, txawm tias lub rubey yog xoob lossis swaying, tom qab kuaj xyuas, lubricate lub pulley, rotating ib feem thiab lwm yam nrog roj txiv mis.
3 Txheeb xyuas seb qhov rotating ib feem ntawm tus nuv tuaj yeem tig tau yooj yim, thiab qhov sib txawv ntawm qhov tsis tuaj yeem loj dhau. Yog tias muaj kev xav ntawm qhov nyuaj ntawm kev sib hloov lossis kev xav ntawm jamming, kev tshuaj xyuas ntxiv ntawm cov kabmob thiab lub tes tsho yog xav tau.
4 Xyuas seb puas muaj teeb meem nrog cov khoom thiab cov qauv ntawm lub ntsiab nuv. Yog hais tias nws yog deformed, hnav tawm los yog tawg, hloov nws nyob rau hauv lub sij hawm.