The Toro 115-2499 Lawn Mower Idler Arm maintains optimal drive belt tension to ensure consistent power transmission and precise blade engagement during operation. This heavy-duty mechanical component serves as a pivoting linkage within the mower deck’s pulley system. It works by swinging under spring pressure to press an idler pulley firmly against the drive belt, automatically taking... https://www.wholetoolbox.com/toro-115-2499-lawn-mower-arm-idler