Ibice bibiri byumukandara wohereza amashanyarazi byashyizwe kumashanyarazi.Umukandara w'imbere wohereza imbaraga muri sisitemu yo gukata, aribyo bita gukata amashanyarazi, naho umukandara winyuma wohereza imbaraga muri sisitemu yo kugenda, bita umukandara w'ingendo.Umukandara w'ingufu zo gukata uhujwe na sisitemu yo gukata binyuze muriyi nziga.Iyi ni pinch pulley, ihujwe no gukurura insinga.Iyo insinga yo gukurura insinga ikomejwe, pinch pulley ihagarika umukandara wohereza, kandi imbaraga za moteri zoherezwa muri sisitemu yo guca.Iyo insinga ya kabili itinze, igabanya ihererekanyabubasha ryimbere.Hariho kandi agapira gato ku ruhande rw'umukandara w'ingendo.Pinch pulley ihujwe no gukurura insinga.Iyo pinch pulley iri muriyi myanya, umukandara uba worohewe, kandi imbaraga za moteri ntishobora koherezwa inyuma.Mu buryo nk'ubwo, komeza insinga zikurura.Iyo uhinduye, pinch pulley yegera kandi igahuza umukandara w'amashanyarazi, bityo ikohereza imbaraga za moteri kuri pulley yinyuma izunguruka, ihujwe na garebox.Nibikoresho bya gearbox, birimo ibice byinshi byo guhuza ibikoresho.Binyuze mu guhuza ibikoresho bitandukanye, guhindura umuvuduko wa moteri no kuzenguruka byarangiye.Kuri garebox, iyi nziga izunguruka nimbaraga zayo zinjiza, kandi guhuza ibyuma imbere muri garebox itwarwa niyi mpinduka yihuta Igikorwa cya lever kirarangiye, iyi niyo shitingi yo gukuramo amashanyarazi ya gare, yohereza imbaraga mukugenda Sisitemu.