The McCormick 6651615A1 is an authentic OEM special service tool designed for maintenance and repair tasks across a wide range of McCormick X-series tractors. This essential tool ensures proper servicing and helps maintain the integrity of your agricultural machinery. Verified for use with models including X4.20, X4.30, X4.40, X4.50, X4.60, X5.35, X5.45, X5.55, X6.420, X6.430, X6.440, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X8.660, X8.670, X8.680, and X8.690.