This chain drives the inclined conveyor that moves crop material upward from the header to the threshing mechanism. It is a roller chain with a fixed number of links designed to match the sprocket centers on the conveyor assembly. A worn or stretched chain causes slip, reducing feed rate and leading to uneven material flow into the cylinder. The manufacturer machines the pin and bushing interfaces to the same pitch tolerance as the original assembly, so the chain engages the sprockets without backlash. On installation, verify the chain tension per the service manual and replace the conveyor slats if they show wear.