The Hustler 107881 Pump Idler Assembly is a genuine OEM replacement part designed for various Hustler Fastrak series zero-turn mowers. This essential component maintains proper tension on the pump belt, crucial for the efficient operation of the hydraulic system. Constructed from durable materials, the idler assembly ensures reliable performance and longevity, helping to prevent belt slippage and wear. Replacing a worn or damaged idler assembly with the Hustler 107881 restores optimal power transfer and extends the life of your mower's drive system.