This V-belt transmits power from the engine to the cleaning-shoe drive on a grain harvester. It connects the drive pulley to the shaft that oscillates the sieves and the cleaning fan, maintaining the correct speed ratio for material separation. A worn or slipping belt reduces fan speed and sieve stroke, leading to incomplete grain cleaning and increased losses over the sieves. The belt is constructed with a cogged inner profile to match the pulley grooves and reduce heat buildup during continuous operation. When replacing, verify the belt tension and pulley alignment to prevent premature wear.