Makina a njerwa omwe sanawotchedwe amanjenjemera mwamphamvu, zomwe zimakhala zosavuta kuchita ngozi monga kumasula zomangira, nyundo zosazolowereka, ndi zina zambiri, zomwe zimapangitsa ngozi zachitetezo. Kuonetsetsa chitetezo, tcherani khutu ku mfundo zitatu zotsatirazi mukamagwiritsa ntchito makina osindikizira njerwa molondola:

(1) Samalirani kusamalira. Kuchuluka kwa ntchito ndi maola ogwira ntchito a zipangizo zamakina osawotchedwa ndi ofanana ndi a makina ena, zomwe zimadalira ntchito yachibadwa ndi kukonza zigawo zikuluzikulu. Tiyenera kudikira nthawi zonse kuti tiwone makina osindikizira njerwa. Kwa makina atsopano osindikizira njerwa, makina osindikizira njerwa amtundu ndi makina osindikizira njerwa a hydraulic, samalani kuti muwone kachulukidwe. Pakhoza kukhala mavuto ang'onoang'ono ang'onoang'ono akamagwiritsidwa ntchito koyamba, choncho musakhale osasamala. Pambuyo pakugwiritsa ntchito kwa nthawi yayitali, kuchuluka kwa zowunikira kumatha kuchepetsedwa moyenera, koma kuwunika pafupipafupi kumafunika. Makina omwe ali ndi mphamvu yogwira ntchito kwambiri ayenera kuyang'aniridwa nthawi zonse.

(2) pofuna kuwonetsetsa kuti makina akugwiritsidwa ntchito moyenera komanso osachedwetsa nthawi yomanga, akumbutseni mabizinesi kuti azisunga zida zosagwira ntchito nthawi zonse mukamagwiritsa ntchito nyumba yosungiramo zinthu.

Ziwalo zomwe zimawonongeka pafupipafupi nthawi zambiri zimakhala ndi ntchito zolemetsa. Pogwiritsa ntchito, ogwiritsira ntchito ayenera kuyang'aniridwa mosamala ndipo zolakwika ziyenera kupezeka panthawi yake kuti zitsimikizidwe kuti zikugwira ntchito bwino.

(3) Musanagwiritse ntchito makina a njerwa osawotchedwa, ayenera kufufuzidwa mosamala musanagwiritse ntchito. Ndizoletsedwa kwa anthu omwe si akatswiri kugwiritsa ntchito zida. Samalani ndondomeko ya ntchitoyo ndipo musasinthe ndondomeko ya ntchito.