This V-belt drives the cleaning-system shaft on the parent combine. It transmits power from the drive pulley to the fan and sieve assembly, maintaining the rotational speed needed for proper grain separation. A worn or slipping belt reduces cleaning fan speed, which leads to incomplete chaff removal and increased grain loss over the sieves. The belt is manufactured to the original cross-section profile and length specification so that it seats correctly in the pulley grooves without requiring tensioner adjustment beyond the normal range.