Fertilizer Countershaft Unit Chain Tightener for IH Farmall Cub Tractors equipped with 1 Point Fast Hitch (Fertilizer unit 101A)
Case IH part number 520207R91.
Search for part number 512189R91 above in site search box for Chain Tightener for NON FAST HITCH Cub Tractors.
Used also on the below listed IHC equipment:
IH Planters- Cub-173A, Cub-174A, and 184.