The Case IH 3140017R21 is a genuine OEM alternator arm designed for reliable mounting and tensioning of the alternator in a range of Case IH agricultural equipment. This critical component ensures the alternator is securely held in place, allowing for proper belt alignment and efficient power generation. Manufactured to original equipment specifications, the 3140017R21 provides durability and precise fitment for optimal performance and longevity of your machinery's electrical system.