This V-belt transmits power from the engine or gearbox to the threshing mechanism of the parent combine. It sits on the drive pulleys that connect the prime mover to the threshing drum or rotor assembly. A worn or slipping belt reduces drum speed, leading to incomplete grain separation and increased losses out the rear of the machine. The belt is constructed with a cogged or wrapped profile to maintain grip under varying load. On installation, ensure the belt is tensioned to the manufacturer's specification and that the pulley grooves are free of debris to prevent premature wear.