Abstract: A belt drive attachment for motor driven machines comprising a vertical frame with top and bottom ends, spaced front and rear ends and spaced sides, a substantially flat mounting wall at the upper forward portion of the frame to engage and be fastened to a motor mounting pad on a related machine, bearing means within the frame, an elongate countershaft rotatably carried by the bearing means and having a portion projecting from the frame and a portion within the frame, a mounting plate at the lower rear portion of the frame to releasably cooperatively engage a motor mounting frame of a related motor, hinge means pivotally connect the plate to the frame for pivotal movement of said plate and a related motor relative thereto, clamp means engaged with and between the frame and the plate and releasably hold the plate in fixed pivotal position, a multi-diameter/multi-sheave input pulley wheel is drivingly engaged on the portion of the shaft within the frame, a drive belt is engaged about and between the input pulle