This V-belt transmits drive torque from the engine to the threshing mechanism within the combine harvester. It sits on the pulleys of the threshing drive, coupling the prime mover to the rotor or cylinder input. A worn or stretched belt slips under load, causing a drop in threshing drum speed that reduces separation efficiency and can lead to plugging. The belt is constructed by Gates to match the original cross-section and length, preserving the tension range that the tensioner arm was designed to maintain. On installation, verify the belt sits fully in the pulley grooves and adjust the tensioner to the specified deflection.