There is a nut in the center of the blades. The
easiest way to remove this nut is with an impact wrench. If you don't have one there is
usually a hole in the disc where you can insert a screw driver to lock the blade from from turning and you will need a long handle ratchet in order to give enough torque to remove the nut. Once the nut is removed, the blade will slide right off. If you are doing this to sharpen the blades, you do not need to remove the blade to do this. Use a 1/2 HP grinder wheel and just evenly slide the wheel down the blade until it is sharp. CAUTION: it will cut you finger. Make sure you disconnect the power and the fuel is turned off at the time you do any of this work....
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