The John Deere CC50166 is a genuine OEM chain sprocket designed for various John Deere combines, including S-Series (S550, S650, S660, S670, S680, S690, S760, S770, S780, S790), T-Series (T550, T560, T660, T670, T770, T780), W-Series (W440, W450, W540, W550, W650, W660), C-Series (C670), and 9000 Series (9400, 9410, 9450, 9500, 9510, 9550, 9560, 9600, 9610, 9650, 9660, 9750STS, 9760STS, 9860STS) models. This sprocket ensures reliable power transmission within the combine's chain drive system.