The Husqvarna 539113683 Lawn Mower V-Idler Pulley is a replacement pulley designed to guide and support the drive belt within the mower’s belt system. It works by helping keep the belt aligned and properly tensioned as it rotates, allowing power to be transferred effectively between components. This contributes to consistent blade or drive performance while reducing unnecessary belt s... https://www.wholetoolbox.com/husqvarna-539113683-lawn-mower-v-idler-pulley