Ib qho ntawm cov laj thawj yuav ua tau hais tias cov saw heev xoob. Thov kho cov nruj ntawm cov saw. Qhov laj thawj thib ob yog tias qhov sprocket, saw thiab flywheel tsis nyob hauv tib lub dav hlau, thiab cov txheej txheem txij nkawm muaj raws li nram no:
1. Tshem lub hau xov sprocket thiab tshawb xyuas seb qhov sprocket puas deformed lossis hnav.
2. Nws tshwm sim los ntawm qhov sprocket. Thov kho thiab hloov lub sprocket.
3. Tshawb xyuas seb txoj haujlwm ntawm flywheel thiab lub log rear puas pab txhawb. Yog tias muaj qhov sib txawv, thov kho nws.
4. Yog hais tias tus flywheel hnav, hloov nws.
5. Yog tias cov saw hlau tsis kho lossis hnav, hloov txoj saw hlau. Nco ntsoov tias txoj kev taw qhia qhib ntawm kev sib koom tes ntawm cov saw yog rov qab rau qhov kev taw qhia kev hloov ntawm cov saw hlau.
