Removing the mower blades from your John Deere mower requires attention to safety. Any time you work with mower blades, the chances of injury heighten. The blades must be removed to sharpen or for replacement. Sharp blades on your John Deere tractor or walk-behind mower will help keep your lawn healthy by cleanly cutting your grass. Dull mower blades can rip and tear your grass blades, making your lawn more susceptible to disease.
Park the mower on a flat surface and disengage the mower or blades by depressing the mower/PTO engagement switch to the right of the steering column. Turn the mower's engine off and remove the key from the ignition.
Engage the parking brake by pressing the parking brake lever located to the right of the steering column. Pull out the free-wheeling lever on the rear the mower between the wheels and below the seat.
Lift the hood of the mower and pull the sparkplug wires from both sparkplugs on each side of the engine. Raise the mower's deck by turning the cutting height knob to the highest setting. This knob is between the steering column and the seat on the body of the mower.
Prop the mower on its side to access the blade. Block the blade with a piece of wood to prevent the blade from turning. Use an adjustable box end wrench to remove the nut and washer from the blade on a 38-inch to-42 inch cut mower or remove the bolt and washer from a 48-inch to 54-inch cut mower. Remove the blade from the bottom of the riding mower.
Park the mower on a flat surface. Pull the sparkplug wire from the sparkplug on the front of the engine.
Siphon the gas from the gas tank and into a gas storage container, using a siphon pump. Turn the mower on its side with the gas tank and air filter facing up.
Loosen and remove the bolt and washer from the blade, using an adjustable box end wrench. Lift the blade from the mower.