80-qib saw feem ntau siv nyob rau hauv qhov chaw ntawm kev nqa khoom thauj khoom thiab yog sib piv nrog lub crane. Lub crane yog lub cav loj. Thaum muaj teeb meem hauv cov txheej txheem ua haujlwm, nws yuav yog qhov teeb meem loj heev. Yog li, feem ntau txij nkawm ntawm cov saw yog ib qho tseem ceeb heev.
Qhov nruj ntawm txoj saw yuav tsum tsis txhob nruj dhau, txwv tsis pub nws yuav ua kom lub zog siv, nws yooj yim rau kev ua rau hnav; Yog tias nws xoob heev, nws yooj yim rau hle. Hauv kev siv cov saw hlau, vim tias lub sijhawm ntev ntawm kev nqa khoom hnyav, lub saw yuav rub tawm, lub sijhawm no, raws li qhov xwm txheej tiag tiag, txoj saw ntev dhau mus tshem ob peb, tab sis muaj taw tes rau them sai sai rau, cov xov tooj ntawm cov saw yuav tsum muaj txawm tias. Lub saw yuav tsum tau lubricated nquag thaum lub sijhawm ua haujlwm (qhov twg cov saw thiab crane txuas) kom txo tau hnav. Lub tshuab qub crane tuaj yeem tsis tau nrog cov tshiab, vim tias cov saw sib txawv dais cov sib txawv, txwv tsis pub nyob rau hauv kev ua haujlwm ntawm lub sijhawm yooj yim los tsim lub zog tsis sib xws, rub cov saw.
80 chav kawm saw hlau yog ib qho muaj ntau txoj saw nqa kev lag luam, yog li hauv kev siv txhua hnub ntawm cov xim ntau rau kev saib xyuas kev tswj xyuas. Ncaws sijhawm muaj teeb meem, kom tsis txhob muaj qhov xwm txheej tshwm sim, vim hais tias: kev nyab xeeb tseem ceeb dua li mount tai!
