This chain assembly drives the return pan that carries separated grain from the threshing unit to the cleaning shoe. It is a roller chain with attached blades that sweep the pan surface, maintaining material flow across the width of the machine. A worn or stretched chain causes uneven pan travel, leading to grain buildup and reduced separation efficiency. The chain pitch and roller diameter match the original sprocket geometry, so no sprocket replacement is needed when installing a fresh chain. On installation, verify the chain tension is within the specified range to prevent slapping against the pan rails.