Amagiya angenye yezingxenye ezibalulekile ku-gearbox.Amagiya yizingxenye zemishini ezisiza ukushintsha isivinini kanye ne-torque yama-spinning blades ku-tiller.Ku-gearbox, amagiya asebenza ndawonye ukuze adlulise amandla esuka ku-input shaft aye ku-output shaft, akhuphukayo noma anciphise isivinini sokulima ngendlela efanele.