Mower Blade Replacement Directions


Mowing your lawn not only keeps your grass at an acceptable height, it also helps keep your lawn healthy. A dull mower blade tears at the grass blades, weakening the lawn and making it susceptible to weed invasion. Neil Sperry, author of "Neil Sperry's Complete Guide to Texas Gardening," suggests you sharpen your mower blade once a month during the growing season. Replace your current mower blade if the blade is damaged or can no longer be sharpened because of its age.

Things You'll Need

  • Siphon
  • Gas can or container
  • Cement or wood blocks
  • Oil catch pan
  • Adjustable wrench
  • Wood board
  • Penetrating oil
  • Work gloves
  • Pull the plug wire from the spark plug to ensure your lawnmower does not start accidentally. Siphon the gas from the lawnmower into a gas can or a container approved for gas storage.

  • Prop your mower on cement or wood blocks to access the oil drain plug beneath the deck. Place an oil catch pan underneath the mower. Turn the drain plug counterclockwise with an adjustable wrench to remove it, letting the oil drain into the catch pan. Replace the plug in the mower, and remove the mower from the cement or wood blocks.

  • Tilt the lawnmower on its side. Wedge a board against the lawnmower blade to keep the blade from rotating when you turn the nut that holds the blade to the mower.

  • Turn the nut counterclockwise with an adjustable wrench and remove it from the center blade bolt. Use penetrating oil to help loosen the nut if it appears frozen.

  • Remove the blade from the mower. Take the original blade to a hardware store to get a replacement blade. Match the length, width and bolt hole configurations of the replacement blade with the original.

  • Install the replacement blade on the center bolt of your mower with the cutting edge of the blade facing the direction of the blade rotation when the mower is operating. Replace the nut and tighten it securely to the mower.

  • Lower the mower back to the ground. Replace the oil and gas in the mower. Push the plug wire back onto the spark plug.

Tips & Warnings

  • Wear heavy-duty work gloves to protect your hands from the sharp edges of the mower blade.

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