The John Deere RE170084 is a genuine OEM belt tensioner designed for a wide range of John Deere agricultural and industrial machinery, including 6000, 7000, and 8000 series tractors, S-series combines, cotton pickers, forage harvesters, and sprayers. This critical component maintains proper tension on drive belts, preventing slippage, reducing wear on pulleys, and ensuring efficient power transmission. Manufactured to John Deere's rigorous standards, the RE170084 provides reliable performance and extends the lifespan of associated engine components. Weighing approximately 1.18 kg, it is an essential replacement part for maintaining optimal machine operation.