How to Sharpen a Lawn Mower Blade
To sharpen the blade on your lawn mower:
- Remove the spark plug wire.
- Tilt the mower up on one side.
- Clamp a block of wood to the mower deck to prevent the blade from turning.
- Loosen the bolt holding the blade in place with a wrench, turning it counterclockwise.
- Mark the blade so you’ll know which side is up.
- Sharpen the blade on the beveled side—following the angle of the bevel—using a file, grinder, sharpening stone, or belt sander.
- Remove any burs on the flat side of the blade with a file or sharpening stone held flat against the width of the blade.
- Put the blade back on the mower with the beveled side of the blade facing up.
- Tighten the bolt with a wrench, turning it clockwise.
- Turn the mower back upright.
- Reattach the spark plug wire.
Watch this video to find out more.
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If you want an attractive lawn, it’s important to keep your mower blade sharp. Begin by removing the spark plug wire so there’s no chance of accidental starting. Then clamp a block to the deck to hold the blade in place while you loosen the retaining bolt with a wrench. Pay close attention to which side is facing down.
To sharpen the blade you can use a hand file, a bench grinder, or even a belt sander. Whatever tool you use, you want to work the beveled edges down to a point and remove any burs or nicks. When you put the blade back on, be sure the retaining bolt is nice and tight before reconnecting the spark plug.
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