Lawn mower blade maintenance tools

This page is dedicated to products help keep your lawn mower blades as sharp as possible.

A sharp blade is mission critical when it comes to maintaining a healthy beautiful lawn. A dull blade will tear the grass blades, which in turn causes yellowing of the lawn.

The jagged cut also causes excessive moisture loss and an increased risk of disease. Luckily the cure for this problem is simple. Sharpen or replace your mower blade and re cut the lawn.

Here’s a few questions about blades I’m asked a lot.

So how often should we sharpen our mower blade? At least once at the beginning of each season. However, if your lawn is stony, uneven or you like to cut at the lowest level, you may need to sharpen several times per season. The tools listed on this page will help you do just that.

Hey, if you need video help, check out my mower repair video library, it walks you through the whole process of caring for your blade, from inspecting, removal, sharpening, balancing, refitting and torqueing to spec.

Mower blades

Blade sharpening

I advise my customers to sharpen at the beginning of the season and also mid way through if possible.

How often should we replace our lawn mower blades? This depends on how worn the blade is. Over time, grit and stones will wear away and gouge the blades shape. The mower blade is designed quite precisely, not only does it cut the grass, but also stuffs it into your grass bag.

That’s why a worn blade will not only cause yellowing of the lawn but also not collect the clippings very well. I would advise the average lawn mower user to change the blade every four years.

Lawn mower blades

New blades

I advise my customers to replace about every four years.

What type lawn mower blade is right for me? A blade looks pretty simple but in fact is a clever bit of design. There are two basic options when it comes to grass handling, collect or mulch.

Mulching is a process where the mower cuts very fine clippings and drops them onto the lawn. This helps fertilize the lawn and saves on extra labor involved in collecting.

The trade off is a slightly brown lawn as the mulched clippings decompose.

Two types of lawn mower blade are common.

  1. The Lift blade, also known as the 2 in 1. So called because it cuts the grass and stuffs it into the grass bag. This blade is perfect for you if you like a clean look lawn with no clippings. The lift blade specializes in collecting grass.
  2. The Mulching blade or 3 in 1. So called because this blade cuts the grass, then re cuts the same blades of grass again, and then stuffs it into the grass bag (optional). The Mulching blade is perfect for you, if you like the flexibility of sometimes not collecting grass.

A true mulching blade has only one function – to produce really fine clippings. What we call a mulching blade today is really a hybrid of the lift blade and the mulching blade.

Lawn mower blade

2 in 1

The 2 in 1 is great at collecting grass thanks to the larger trailing wings. Lift blades are available with larger wings, but bigger will require an engine powerful enough to move them.
Lawn mower blade

3 in 1

The Mulching blade typically has a leading edge that's curved, this allows the blade to cut the grass at different heights. The trailing edge is fitted with a curved wing to help move the grass clippings to the grass bag.

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blade sharpening kit

This kit includes the sharpening stone and blade balancer. The sharpening stone is cut at 30° and fits onto a hand drill. If your blade isn't badly gouged, you won't need to remove it to sharpen.

But if it is, remove the blade and after sharpening, check it for balance. Adjust the balance by grinding the heavier side and rechecking. Picture links to

Blade locking tool

This simple tool attaches to the deck and simply blocks the path of the blade which comes in handy when removing and installing the blade bolt. Picture links to

Cordless impact gun

The Ingersoll Rand brush-less impact gun is the Cadillac of impacts. It makes the job of removing stubborn bolts a snap, and as this is a cordless, you can keep it in the trunk of the car for emergencies.

However, this gun is really expensive, and for the occasional user it's probably too much gun. But then again, I don't ever remember saying "I just wish my car had less power". More is more, right!

You don't need this gun to remove the blade, it just makes life so much easier. If you do buy this kit, you won't ever need to buy another. Picture links to

Torque wrench

What's a torque wrench, and why you need it? A torque wrench tightens a fastener to a factory set specification. It prevents components being damaged or falling off.

A mower blade will ideally need to be torqued to specification (Usually between 30 - 50 ft. lbs) Over tightening can lead to engine loss, and if you think I'm exaggerating. Check out this post on my Teng tool torque wrench. Picture links to

DeWalt eye protection

The DeWalt glasses are made from tough polycarbonate. They're lightweight, impact proof, offer UV protection and are vented to prevent fogging. For those of us that need glasses the DeWalt can handle RX inserts. Picture links to

3M Ear Defenders

Lawn mowers can produce over 100 db which is more than enough to damage your ears. I like the quality of the 3M products, I've been using them for years. This set of ear defenders has an NRR of 24 db (Noise Reduction Rating).

The set is Bluetooth connected, so no cables to mess about with, you can seamlessly connect to your phone, listen to music and take calls as the headset has a built in mic. Pretty cool! Picture links to

Mechanix Anti-vibe gloves

Constant vibration can damage the nerves in your hands, It's known as Hand Arm Vibration Syndrome (HAVS) and it's not repairable. Mowers as you know create a lot of vibration which is transmitted through your hands.

I wear Mechanix gloves in the workshop when using air tools, they're made with thermoplastic padding material that absorbs and dissipates vibration. Picture links to

3M respirator

I love 3M products, there great quality and I confident in there performance as I've been using them since forever. The silicone respirator is comfortable, durable. I use it when welding and cleaning old grass and dust from lawn mower decks and engines.

I wear glasses in the workshop and anybody that wears glasses and a respirator will know the value of the 3M downward facing vent. Fogged glasses drives me crazy!!! Picture links to


Auto Technician and Writer at Lawnmowerfixed | Website

John Cunningham is an Automotive Technician and writer on I've been a mechanic for over twenty years, I use my knowledge and experience to write "How to" articles that help fellow gear-heads with all aspects of mechanical repairs, from lawn mowers to classic cars.