Zigawo za thirakitala ndizofunika kwambiri zomwe zimawonetsetsa kuti mathirakitala azigwira ntchito modalirika, mwamphamvu komanso mwaluso pamitundu yonse yantchito zaulimi. Mathirakitala amakhala ngati mphamvu yayikulu paulimi wamakono, ndipo momwe amagwirira ntchito nthawi zonse amadalira mtundu ndi kufanana kwa gawo lililonse lolondola.

Zigawo zazikulu za thirakitala zimaphatikizapo makina a injini, clutch, gearbox, shaft yoyendetsa, ma axles akutsogolo ndi kumbuyo, ma hydraulic system, shaft ya PTO, mayendedwe, zosefera, matayala, radiator, zisindikizo ndi zolumikizira. Gawo lirilonse limagwira ntchito zofunika monga kutulutsa mphamvu, kusintha liwiro, chiwongolero, mabuleki ndi kuyendetsa.

Zigawo za thirakitala zapamwamba kwambiri nthawi zambiri zimapangidwa ndi zida zamphamvu komanso zosavala, zokhazikika komanso moyo wautali wautumiki. Amatha kuzolowera malo ogwirira ntchito ovuta monga malo olimidwa, kufesa, mayendedwe ndi ulimi wothirira, kuchepetsa kulephera kwanthawi yayitali yaulimi ndikuchepetsa mtengo wokonza.

Kuvala ziwalo monga zosefera, malamba, zisindikizo zamafuta ndi zonyamula zimafunikira kuyang'aniridwa nthawi zonse ndikusinthidwa. Magawo a thirakitala okhazikika komanso odalirika amatha kuwongolera magwiridwe antchito, kuwonjezera moyo wamakina ndikuwonetsetsa kuti ulimi ukuyenda bwino.

Pachitukuko chamakono chaulimi, magawo a thirakitala ndi chitsimikizo chofunikira cha mphamvu zaulimi. Amathandizira mitundu yonse yamakina afamu, amathandizira kukonza zokolola, amachepetsa ntchito za alimi komanso amapereka chithandizo champhamvu pakupanga chakudya komanso chitukuko chakumidzi.