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Sharpening a Mower Blade


A sharp mower blade is critical to a good-looking lawn. Mow with a dull blade and you'll tear the end of the tiny blades of grass, creating a ragged cut that quickly turns brown, giving your lawn a dry, beige cast even if it's actually quite moist. Clean cuts with a sharp mower, on the other hand, promote good lawn health by preventing disease from getting a foothold in a sloppy, uneven cut.


Ideally, a mower blade should be sharpened once every month or two. It's easy to do and even all-thumbs types can do it quickly!






Step 1

Step 1: Remove the spark plug wire

First, remove the spark plug wire to prevent the mower from starting accidentally.


Step 2

Step 2: Take off the blade using wrench

Take off the blade with a wrench by removing the nut that secures it to the mower deck (the main part of the mower). You may have to wedge a piece of lumber between the blade and the deck to keep the blade from turning.


Step 3

Step 3: Sharpen the edge of the blade using a file

Sharpen the edge of the blade using a file or a grindstone, keeping it at a roughly 45-degree angle, following the angle of the existing edge. Take care to even out rough spots.


Step 4

Step 4: Check the blade balance for smooth running

For a mower to run smoothly, the blade must be balanced, so take this opportunity to check the balance. Support the blade under its center with a rod or other narrow horizontal support, then spin it to check its balance.


Step 5

Replace the blade, taking care to knock out chunks of grass or mud that may have accumulated under the mower.