The Ariens Company 21548266 Lawn Tractor Flat Idler Pulley helps maintain proper belt alignment and smooth power transfer for dependable mower operation. Designed as a replacement flat idler pulley for compatible lawn tractors, it guides and supports the drive belt while maintaining the correct belt tension during use. As the engine powers the belt-driven system, the pulley allows the... https://www.wholetoolbox.com/ariens-company-21548266-lawn-tractor-flat-idler-pulley