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Lawn Mower Blade Repair

Updated on December 3, 2010

Fix Lawn Mower Blades

So many things can damage you lawn mower blade, that you want to make sure that you regularly perform maintenance so that you can keep your lawn mower blade sharp and performing properly.

You'll find that rocks and debris will find their way into your yard, and you may not have a chance to avoid it while landscaping and cutting your yard. When your blade hits the debris, it can become chipped, bent, or broken, which is why it's important to regularly monitor your lawn mower blades so that you can repair any issues.

You will generally notice when it's time to check your blades because even without flipping the mower over and looking at it, you will notice the mower will begin to vibrate or shudder more than it has before. Plus, if the blade is dull or chipped, you'll notice that your lawn will have uneven streaks and edges in it.

So, when it's time to check your lawn mower for any repair or maintenance that you need to do, don't forget to check the blades. The oil and gas in your mower aren't the only things that need to be replaced once in a while.

When repairing lawn mower blades, make sure that you have the proper equipment, which may include, a metal file or sharpener attachment, container to hold gas and oil, a funnel to easily transplant the gas and oil, an adjustable wrench, and a pair of durable gloves to protect your hands from cuts and scratches.


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Since a lot of damage can easily occur to your lawn mower blades, it's important that you know how to fix the blade so that you don't cause more damage to your lawn mower.

When getting ready to fix your lawn mower blade, you need to prepare your lawn mower so that you can easily remove the blades. It's easier to fix the mower blades if you have removed them from the lawn mower.

Before you remove the blade, you want to turn the mower off and let the engine cool off. They turn it over to drain the gas and oil. (You don't want a hot engine filled with combustible fluids and gases to ignite.) Remove the gas tank cap, turn the mower on the side, and let the gas drain into an container.

Now, you're ready to turn the lawn mower back over so that the blade is exposed. Using a wrench, you want to loosen and remove the nut that holds the blade in place.
Wearing gloves, you'll want to remove the blade.

  • Dull Blade- If the blade is dull, you can use a metal file, grindstone, or an emery wheel to sharpen the blade
  • Bent Blade- It's not ideal to straighten out a bent blade to reuse. If the blade is bent, you want to just replace it.
  • Chipped Blade- You don't want to use a chipped blade, and it's hard to grind out any chips, which would make the blade safe to reuse. If the blade to your lawn mower is chipped, you want to replace it. If the blade is minimally chipped, you may be able to just grind down the chips without having to replace the blade, but you want to carefully examine before making the decision to repair or replace
  • Regular Blade Cleaning- Use a piece of wood to block the blade so that it doesn't move. Use steel wool or emery cloth to clean off any rust or grim on the blade.

Once you're sharpened or purchased a new blade for your mower, you'll want to reattach the blade. Tighten the nut back in place, and turn the mower upright. Refill the oil and gas; use new oil if the container that our drained the oil into was dirty. If the container was clean, you can reuse the original oil.

Test the mower and the repaired or replaced blade.

Mower Blade Sharpener

Sharpen Lawn Mower Blades

It's recommended that your run routine maintenance on your lawn mower once a month. You want to check the blades, clean them, sharpen the blades, and perform any other maintenance that you may need to at that time.

When sharpening your mower blades, it's easiest if your use a bench grinder, especially if the blade is in bad shape. If you don't have a bench grinder, you can purchase attachments for a dremel tool or power drill.

Run the blade back and forth on the grinder or attachment. You want to grind out any nicks or surface chips. If the blade is badly damaged with chips that are all the way through the blade, then it's best to just replace the blade.

By running the blade perpendicular on the grinder, you'll get a blunt, straight edge; then grind at the length of the blade until you have a sharp edge, which will achieve better performance.

Once you've completed the process of sharpening your mower blade, you want to balance it. If the blade isn't balanced, you will cause damage to your lawn mower.

All you need is a plastic balance that you can purchase for under $10. Sometimes, you can find sharpener/balancer sets, which can range from $20 and under depending on where you buy it. Amazon has a blade shapener and balancer kit for under $10 that will do everything you need it to.

When using the blade balancer, you'll place the blade on the balancer about half way. If the mower blade tips to one side or the other, you'll need to grind a little more off the end that dips in order to lighten it. Continue to do so until the ends of the blade balance, and then reattach the blade to your lawn mower.

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