Lub luag haujlwm ntawm cov menyuam yog txhawb nqa qhov hnyav ntawm txoj siv conveyor thiab cov khoom siv. Kev ua haujlwm ntawm cov menyuam yuav tsum hloov tau thiab txhim khu kev qha. Txo qhov kev sib txhuam ntawm txoj siv conveyor thiab idler roller plays lub luag haujlwm tseem ceeb hauv lub neej ntawm txoj siv conveyor, uas suav txog ntau dua 25% ntawm tag nrho cov nqi ntawm cov khoom siv conveyor. Txawm hais tias cov menyuam yog ib feem me me ntawm txoj siv conveyor thiab cov qauv tsis yooj yim, nws tsis yooj yim rau kev ua kom lub siab zoo - cov menyuam zoo.
Muaj ntau yam kev txiav txim rau qhov zoo ntawm tus idler: tus nqi ntawm radial runout ntawm tus idler; yooj ntawm idler; tus nqi ntawm axial txav.
