This V-belt transmits power from the engine to the threshing drum and related rotating assemblies. It sits on the pulley set that drives the threshing mechanism, maintaining the correct tension to keep the drum speed consistent under load. A worn or slipping belt causes a drop in threshing speed, leading to incomplete separation and increased grain loss. The belt is manufactured by Gates to match the original cross-section and length, which ensures proper pulley contact and tension without requiring shimming or adjustment of the tensioner beyond its normal range. On replacement, verify the belt runs in the correct rotation direction and that the tensioner is set to the specified deflection.