Qhov zoo ntawm cov saw hlau tuaj yeem raug txiav txim los ntawm kev saib nws cov tsos, uas yog ib qho kev xav zoo heev.
1. Txawm tias cov saw hlau sab hauv / sab nraud yog deformed, tawg, los yog corroded.
2. Seb tus pin yog deformed, tig los yog corroded.
3. Txawm hais tias cov menyuam yuav tawg, puas lossis hnav ntau dhau.
4. Txawm tias qhov sib koom ua ke yog xoob thiab deformed.
5. Puas muaj lub suab txawv txav lossis txawv txav thaum ua haujlwm? Puas yog cov saw hlau lubrication nyob rau hauv qhov zoo?