This V-belt transmits drive torque from the engine to the threshing mechanism on a grain harvester. It runs on the pulley set that powers the thresher drum and associated rotating components. A worn or slipping belt reduces drum speed, leading to incomplete separation and increased grain loss. The belt is constructed by Gates to match the original cross-section and length, so it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the standard range. On replacement, verify that the belt runs in the correct rotation direction and that the tensioner is set to the specified deflection.