The invention concerns a mechanized farming device (1), comprising a frame (10) bearing at least one tillage tool (15), a gearbox (33) and an engine (17) rotationally driving said tool (15) by means of said gearbox (33) and a transmission belt (18) slackly mounted on two pulleys (16, 19), one pulley linked with the shaft driving said engine (17) and the other linked with said gearbox (33), the clutch engagement being obtained by the application, against said belt (18), of tensioning means (40, 401) that can be maneuvered by a control lever (21) positioned on a grip (12) of the handlebar (11) of said device (1). According to the invention, said device (1) comprises a protection hood (20) for said belt (18), having first means of fixed attachment (171, 172) with said engine and second means of fixed attachment (331, 332) with said gearbox, said first and second means of fixed attachment defining a center-to-center distance (E) between said engine (17) and said gearbox (33) during the mounting of said engine (17) and said gearbox (33) on the frame (10).
