The McCormick 6637647A2 is a genuine OEM belt tensioner designed for various McCormick tractor models, including the CX, MC, MTX, and XTX series. This critical component maintains proper tension on the drive belts, preventing slippage and ensuring efficient power transmission. Manufactured to OEM specifications, it provides reliable and long-lasting performance, crucial for the smooth operation of agricultural machinery. It measures approximately 95mm in length, 51mm in width, and 51mm in height, with a weight of about 0.12 kg.