This chain drives the inclined conveyor that moves crop material from the header into the threshing mechanism of the parent combine. It transmits torque from the lower drive sprocket to the upper drum, maintaining the speed differential needed for consistent material flow. A worn or stretched chain causes slipping, which reduces throughput and can lead to plugging at the feeder housing entrance. The chain is constructed with roller links and pins sized to match the original sprocket tooth profile, preserving the engagement geometry that prevents skipping under load. On installation, verify the tension aligns with the manufacturer's specification and that the master link clip is seated fully.