This chain drives the reel tine bars on a harvesting machine header. It transmits rotation from the header gearbox to the reel shaft, synchronizing the tine-bar motion with the cutterbar feed. A worn or stretched chain causes the reel to lag, leading to uneven crop pickup and increased tine-to-cutterbar interference. The manufacturer machines the link plates and pins to the original profile, which maintains the correct engagement with the sprocket teeth and eliminates the need for additional tensioner adjustment. On installation, verify the chain is not twisted and that the master link clip is oriented with the closed end facing the direction of travel.