The Cub Cadet 603E05285B Lawn Mower Deck Idler Arm Assembly helps maintain proper belt tension and smooth operation within the mower deck system. It supports the deck belt by providing the necessary movement and positioning as the mower operates, helping maintain consistent belt engagement. This assembly is designed for compatible Cub Cadet lawn mower decks and can be used to replace ... https://www.wholetoolbox.com/cub-cadet-603e05285b-lawn-mower-deck-idler-arm-assembly/603E05285B.html