Guide On How To Sharpen and Remove Lawn Mower Blade in Simple Steps

A beautiful lawn requires maintenance results in a lot of sweaty work.

Fortunately, the right tools can make gardening and landscaping less time-consuming.

That’s why we all love our lawnmowers. since they make mowing a little less tedious.

However, over time, lawnmower blades can become dull and may need sharpening. In this post will will guide you on how to remove lawn mower blade in simple steps.

Whether you are using a riding lawn mower or a walk-behind type, it is essential to sharpen dull old blades or replace them with new ones.

If your lawnmower is not cutting grass properly, this will slow you down.

The mower needs to cut grass in an efficient manner. Keeping its blades sharp for faster and efficient mowing is essential.

Most lawnmower blades need to be sharpened twice a year when used regularly (or after 10 hours of use for optimal performance).

Sharpening takes less than 30 minutes when you have the right tools.

Let’s dive right into the fun part – the lawn isn’t going to mow itself!

How to Change a Lawn Mower Blade?

A dull blade doesn’t cut the grass. It only tears it off.

Therefore, if you see small patches of grass in an area that is freshly mowed, prepare your sharpening tools, and don’t forget to wear gloves for safety.

First, check the user’s manual and the model number in case you need to buy and replace your old one with a new blade.

If you don’t need a new one, grab a socket wrench or a regular wrench; make sure the wrench can fit on the bolt on your mower.

By the way, if you’re looking for a socket wrench set we highly recommend this socket wrench set. It’s not the largest set you can buy, but it has everything you need for your handyman tasks around the house.

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Ensure Safety

lawn mower blade is being held by a man

You need to ensure the engine won’t start up while changing the lawnmower blades. If you own an electric lawnmower, remove the battery.

If you own a gas mower, make sure the gas tank is empty before you begin. The risk of the engine starting up while changing the blades will be reduced upon doing these steps.

For additional safety, you must remove and disconnect the spark plug as well as the ignition wire (if applicable) to avoid any accident or harm while you are busy working on the blades.

The risk of the engine starting up will be further reduced upon doing these steps.

Depending on the model you have, you may locate the spark plug on the side of the chamber.

In the case of a riding lawn mower, the spark plug may be located under the seat.

Applying these preventative measures is essential to make sure the lawnmower doesn’t start accidentally.

Lastly, do wear gloves! You’re not doing anything heavy-duty but let’s just say no gloves mean getting dirty and possibly some blisters. We say go with some gloves for a better experience.

We highly recommend these working gloves for you. These working gloves are good for any type of yard work or handyman task around the home.

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Lift the Deck

You must now move the mower on its side. Lift the deck to expose the lawnmower blade. Notice, the engine air cleaner will be facing upwards. Open the mower deck and prop it using a car jack or a stick of wood.

Now, use a piece of wood or a universal blade removal tool. You should carefully place the wooden block behind the blades to prevent them from moving.

Before removing the blade, you can use a rust removal spray like WD-40 to easily remove bolts and nuts.

Remove other debris or dirt for easy access to the blades.

One tip: keep the owner’s manual close by, since all mowers have different specifications.

Remove the Blade Retaining Bolt

With the help of a socket wrench, turn the mounting bolt or nut counter-clockwise. An easy way to remember is that it’s in the same direction as it moves when it cuts the grass.

If the blade’s retaining bolt is stuck or is rusted over, you might need to use a breaker bar to loosen the nut. Keep the bolt in a safe spot as you change the lawnmower blades.

Using an appropriate size wrench, loosen the blade from its position. As you remove the lawn mower blade, take note of a few items.

You should remember how it was positioned and the degree of orientation. After sharpening the mower blades, you need to reinstall a new blade in the same position and orientation.

Also, pay attention to how the old blade fits in the blade adapter in the engine’s driveshaft.

Take close note of which side of the blade faces down and how the washers fit onto the blade retaining bolt.

Sharpen Old Blades or Replace with New Blades

remove lawn mower blade which is holding grass

You might be wondering what to do next. You should now examine the mower blades and decide whether they need to be sharpened or if it’s too damaged and chipped beyond repair.

Your local hardware store might carry the blade you need, but make sure you get the same length as the old one and new washers.

If you want to sharpen them, use a hand mill file (or if you have access to a grinding machine) to grind off its cutting edge.

But to be honest, a simple handheld mill file is all you need. If you’re looking for one, we recommend this grinding mill file. It’s has a handle, cheap, and super useful for other sharpening tasks like sharpening your hedge trimmer blades.

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Fix the Blade

Lastly, you will want to make sure the correct side of the blade faces the engine’s drive shaft and fix it at the same orientation.

Consult the owner’s manual for torque specs to see how much you need to tighten the bolt.

Over tightening can cause vibrations and under-tightening can lead to an unusable blade.

You’ll also want to ensure the blades are in place. Tighten them more if they wiggle up and down. Be careful while you handle the sharp edge of the blade.

Once the blade is changed out, it’s time for a quick inspection. Check the oil level, engine’s driveshaft, and air filter.

You must perform these checks regularly to ensure better performance, but since you are already working on your mower, it’s a good opportunity to check all these parts.


Which Way Do You Turn The Bolt To Remove A Lawn Mower Blade?

If it’s a reverse threaded lawnmower blade, you need to turn the mower blade bolt clockwise direction.

On the other hand, if it’s a normal one, turn it in the direction the lawnmower blade rotates to cut the grass: anti-clockwise.

Are Lawn Mower Blades Reverse Thread?

Refer to the owner’s manual to check whether your lawnmower’s blades are reverse thread. Most newer models are reverse threaded, but it varies from product to product.

How Often Do i need to Sharpen My Lawnmower Blades?

Most lawnmower blades need to be sharpened twice a year when used regularly (or after 10 hours of use for optimal performance).


A lawnmower is a large piece of machinery. Although keeping your lawnmower’s blade sharp might sound complicated, it’s pretty simple.

You just need to follow the precautions and consult the mower manual. You can then change the lawnmower blade without trouble.

Remember, a lawnmower with sharp blades is the key to keeping a healthy lawn.

Don’t forget, you can use your handheld mill file to sharpen your reel mower blades as well!

Now, let’s get ready to cut some grass and enjoy your freshly mowed lawn.

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