This hexagonal V-belt transmits drive torque from the engine pulley to the driven components in the harvester’s drive system. It sits in the belt path between the crankshaft pulley and the input sheave of the main gearbox, where its hexagonal cross-section engages matching grooves for positive traction without slipping. A worn or stretched belt causes speed loss at the driven shafts, leading to uneven header or rotor speeds and reduced threshing efficiency. The belt is constructed by Gates to match the original profile geometry, ensuring correct groove seating and tension retention without requiring shimming or adapters. On installation, verify the belt rides flush in all pulley grooves and tension it to the manufacturer’s specification.