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When to Replace a Lawn Mower Blade? Tips from professionals

One of the best ways to have a healthy lawn is by cutting it using sharp blades. A dull mower blade will rip off the grass and weaken it, which leads to diseases. Therefore, sharpening the blades is the ideal tactic to reduce your mowing time and ensure you do not get too tired. However, before buying new mower blades, inspect the old ones to ensure they need a replacement.

When to Replace a Lawn Mower Blade?

  • If the lawnmower is cutting grass unevenly
  • When the blade is bent or damaged
  • When the blade is dull after sharpening
  • If it is more than a few years old
  • When the the condition of the blades is bad
  • Torn grass

So, when should you consider replacing your mower blades? Read to know some of the signs that the blades are not working as they should, and when the replacement should happen.

Signs You Should Replace Your Mower Blades

If you have sharpened your blades several times and seem to have too much damage, getting a new set of blades is a perfect deal. Below are the things that indicate it is time to replace these blades:

● Cutting Grass Unevenly

If your grass seems uneven after mowing, that is an indication of dull or damaged blades. Normally, your lawn mower should cut the grass at a similar height if the blades are sharp. However, when these blades are damaged or dull, you will be forced to mow the same area a couple of times before getting the desired results.

● Bent or damaged

It is common for the blades to bend or damage if you accidentally mow over the rock and debris. A bent blade is often off-balance and poses a safety threat to you and the mower. Replacing it on time could save you lots of money, and ensure mowing happens without any complications. So, how do you know that the blade is bent?

● Dull After Sharpening

You know you are dealing with a complicated matter if the blades do not mow as expected even after sharpening them. A dull blade contributes to an unhealthy lawn since the grass is ripped out, making it hard to get even cuts. Repeated sharpening only weakens the blade and makes it susceptible to serious damages, so work towards replacing the blades. If you want to improve your blade’s lifespan, ensure they are constantly sharpened and thoroughly checked after every mowing period. Also, make sure the blades are cleaned after each mowing session and dry it to prevent rust.

● If It Is More Than A few Years Old

Generally, manufactururs recommended to have the blades replaced every few years. Of course this greatly depends on how loing you use your lawnmower. If you have a large lawn and use if often it can even mean you have to change your blades yearly. But if you use if less often, maintain it well, and do not damage it, the blade can be used for many years.

● Look At The Condition of the Blades

Check to see if the blades are dented or chipped since they will not cut the grass evenly. That might be as a result of corrosion caused by moisture in the lawn or dirt. If you constantly sharpen the blades, it could lead to weakened metal, and you will be forced to replace the blades.

● Torn Grass

Inspect your grass to see if the tips are cut and if they look torn out. That indicates the blades are damaged since that is the only time your grass will have a nasty cut. If that is the situation, have the blades replaced immediately since that could be harmful to the grass as it inhibits healthy grass growth.

Common Errors People Make When Replacing the Blades

During the blade replacement, people are prone to make mistakes such as:

  • Direction: Placing the blade in the wrong direction.
  • Replacing it too soon: Replacing a blade that can still be sharpened and perform the tasks well.
  • Replace it wrongly: Trying to replace the blade without any experience or without asking for help from an expert.

Different types of Mower Blades

Since there are different types of mower blades, look at the manufacturer’s data to ensure it is suitable for your lawnmower. Here are a few great choices to consider:

  • Gator Blade: It is a 3-in-1 blade with medium, low, and high lift, allowing you to use different cutting techniques. The blades are easily spotted in stores as they have serrated sections at the end.
  • Basic Mulching Blade: It is enough to cut grass and fits in a range of mowers. The blades have distinctive and curvy edges, enabling you to cut the grass finely.
  • High-Lift Blades: The blade produces airflow useful in pushing grass clippings into the discharge chute. It helps give your yard a perfect trim and cut it to the utmost precision. These blades range from 1-20 inches, hence suited for a yard with long grass.

When Should You Replace The Lawn Mower Blades?

An average homeowner should replace their mower blade each year during the start of every season. However, if the blades get damaged before the season, have the blades replaced immediately. Before any replacement is done, inspect the blades to see which condition they are in and consult the user manual for guidance. The manual should also help you know the safety precautions to take during replacement and still under warranty. When replacing these blades, wear heavy-duty gloves to protect yourself.

A lawnmower blade could last for about 200 hours, but that is dependent on the mowing intensity. If your yard has lots of sticks and stones, your blade might have to be replaced more than once a year. However, before replacing it, ensure it has been sharpened a couple of times, but if it is worn out or keeps getting dull, replace it. The ideal way to achieve a clean cut when mowing is using sharp mower blades. If you want to have an easier job, keep a spare blade and occasionally swap the blades on different mowing sessions.

Mowing your yard needs the ideal equipment to avoid pests and diseases and ensure that your lawn looks healthy. The wrong blades could damage even the healthiest lawns, so be on the lookout for damaged blades to avoid having discolored grass. Replacing the blades when you see damages that cannot be corrected through sharpening saves you time and money, and ensures you can still mow without experiencing any issues.


● Should You Sharpen Or Replace Your Mower Blade?

There are things to look out for as they determine whether your blade needs sharpening or a replacement. Pay attention to how it is cutting the grass, and if there are dents on the blades. Sharpening should be done if your blades are dull and have not been in constant use, meaning that there is still metal that you can sharpen. If the blades appear thin, then you should replace it. Also, you have to put into consideration how long you have used the blades to know if it is suitable.

● How Often Should You Sharpen Your Blades?

A lot of times, you will need to sharpen your blades twice per season. That should be in the beginning and somewhere in between the season, especially if you mow over rocks or sticks. Determine how often to sharpen the blades based on how it feels after every mowing session.

● Are New Mower Blades Sharpened?

Some brands have a small amount of coat paint, and you will need to sharpen the blades before using them. However, most brands do not require sharpening since they are in good condition, so do not waste your time sharpening them. New blades are ready to be used, so install the blades once you get them.

Final remarks

Regardless of whether you mow regularly, your blades must be in good condition always. If you notice dents, damages, or as if your blades are worn out, it might be the right time to replace them. Thoroughly inspect your blades to see if there are any damages to your lawnmower. A broken or damaged blade is harmful to you and could also affect your machine’s lifespan, so be sure to get a replacement as soon as you realize it is damaged.

Dull blades do affect your yard’s health since it gets ripped off with every mowing session. It also leads to a short lifespan since your mower is continuously straining to trim the yard. After every mowing, look at the blades to see if the tips are jagged. Looking at the signs indicated here will help you to know when you should have the blades replaced, the type of blades available, common errors to avoid, and other essential things about lawn mower blade replacement.

  1. Rhonda Stone says:

    Can using a dull blade actually cause diseases in the lawn?

    • Allard Vdhooft says:

      Using a dull blade can weaken the grass and lead to diseases. Sharpening your mower blades is crucial for a healthy lawn. Check for signs of damage and replace as needed.

  2. Norman Moore says:

    I always thought my mower was broken when the grass was uneven, now I know it’s just the blades.

    • Allard Vdhooft says:

      Thank you for reading! It’s great to hear that the information was helpful for you. Best of luck with your mower blade maintenance in the future.

  3. Kim Gibson says:

    Are there any specific brands of blades that are recommended for durability?

    • Allard Vdhooft says:

      Thank you for your question, Kim! For durability, I recommend brands like Gator Blade, Basic Mulching Blade, and High-Lift Blades. Keeping your mower blades sharp is key to a healthy lawn.

  4. Violet Boyd says:

    How do I know if the blade I have is suitable for my specific lawnmower model?

    • Allard Vdhooft says:

      Hi Violet, if your lawn seems uneven after mowing and the grass appears torn, it might be time to replace the mower blade. Check for dullness, bending, or damage. Hope this helps!

  5. Katherine Bishop says:

    Should I replace both blades at the same time, or can I do them one at a time?

    • Allard Vdhooft says:

      It is recommended to replace both blades at the same time to ensure even cutting and prevent any damage to your lawn. Keeping the blades sharp is essential for a healthy lawn.

  6. Marian Morgan says:

    How long should I wait before replacing my mower blades if they seem damaged?

    • Allard Vdhooft says:

      Inspect your blades for damage regularly. If they’re consistently dull or bent, it’s time for a replacement. Stay on top of maintenance for a healthy lawn!

  7. Judith Peterson says:

    This article has really encouraged me to take better care of my mower blades, thank you.

    • Allard Vdhooft says:

      Thank you for reading! I’m glad the article inspired you to care for your mower blades. Happy mowing!

  8. Constance Cooper says:

    I never knew the condition of the blades could affect the grass like that, very interesting.

    • Allard Vdhooft says:

      Thank you, Constance! Keeping your mower blades sharp is crucial for a healthy lawn. Be sure to inspect them regularly for optimal performance.

  9. Jacqueline James says:

    The different types of blades listed here are helpful, I need to find the right one for my mower.

    • Allard Vdhooft says:

      Thank you for your feedback, Jacqueline! Remember to inspect your old blades before purchasing new ones. It’s crucial for maintaining a healthy lawn. Best of luck finding the right blade for your mower!

  10. Dennis Larson says:

    The signs of when to replace the blades are clear and easy to understand, thank you.

    • Allard Vdhooft says:

      Thank you, Dennis! I’m glad you found the signs for replacing mower blades helpful. Remember, sharp blades lead to a healthier lawn. Happy mowing!

  11. Arnold Martinez says:

    Great tips on when to replace the mower blades, very informative!

    • Allard Vdhooft says:

      Thank you, Arnold Martinez! I’m glad you found the tips on mower blade replacement informative. Happy mowing!

  12. Benjamin Davis says:

    Is there a specific type of sharpening tool that is best for mower blades?

    • Allard Vdhooft says:

      For mower blade sharpening, a bench grinder with a fine wheel is ideal. Ensure proper technique to maintain blade balance and sharpness. Happy mowing, Benjamin!

  13. Gene Jennings says:

    Should I be concerned if I see rust on my mower blades after use?

    • Allard Vdhooft says:

      It’s best to replace your mower blades if you see rust after use. Keeping sharp blades is essential for a healthy lawn. Consider replacing them if they show signs of damage.

  14. Hailey Jordan says:

    Is it a good idea to have a professional inspect my mower blades regularly?

    • Allard Vdhooft says:

      Hi Hailey, having a professional inspect your mower blades regularly is a good idea to ensure your lawn stays healthy and your mower functions properly. It’s best to replace them when needed to avoid any complications.

  15. Victoria Roberts says:

    I never knew dull blades could be so harmful to my lawn, thanks for the info!

    • Allard Vdhooft says:

      Thank you for reading! I’m glad you found the information helpful in maintaining a healthy lawn. Happy mowing!

  16. Brennan Mitchelle says:

    I appreciate the advice on how often to sharpen the blades, I will keep that in mind.

    • Allard Vdhooft says:

      Thank you for reading! I’m glad you found the advice helpful. Keep up the good work with your lawn maintenance!

  17. Alberto Lewis says:

    I appreciate the detailed explanation of different types of blades available, very helpful.

    • Allard Vdhooft says:

      Thank you, Alberto! I’m glad you found the information on mower blades helpful. Remember, sharp blades are key to a healthy lawn. Happy mowing!

  18. Charlotte Fowler says:

    This article has really opened my eyes to the importance of blade maintenance.

    • Allard Vdhooft says:

      Thank you, Charlotte! I’m glad the article was helpful in highlighting the importance of blade maintenance for a healthy lawn. Keep up the good work!

  19. Dylan Peck says:

    What are some signs other than uneven grass that indicate it’s time to replace the blades?

    • Allard Vdhooft says:

      Hi Dylan, signs like uneven grass, blades being dull after sharpening, or over a few years old are indications it’s time to replace them. Keep an eye out for these signs!

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