The McCormick 3674185M91 is a genuine OEM compression spring designed for various McCormick X-series tractors. This essential component ensures proper function within the machinery's system, maintaining tension and absorbing shock. It is compatible with X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.80, X4.90, X5.20, X5.30, X5.40, X5.50, X5.60, X5.70, X5.80, X5.90, X6.420, X6.430, X6.440, X6.450, X6.460, X6.470, X6.480, X6.490, X7.440, X7.450, X7.460, X7.470, X7.480, X7.490, X7.650, X7.660, X7.670, X7.680, X7.690, X7.P650, X7.P660, X7.P670, X7.P680, X7.P690, X8.660, X8.670, X8.680, X8.690 tractor models, offering reliable performance and durability.