When it comes to the time to sharpen your lawnmower's blades, you might be wondering whether or not you can sharpen them without having to remove them, this can save you time from having to detach and reattach them.
It is very possible to sharpen your mowers blades without removing them, you simply need to just secure the blade and use a flat file, however, there are some important tips and steps to follow so you can do this process properly and avoid harming yourself or the mower.
So with that being said, we have put together a small guide below that will explain to you why it's important to keep your mowers blades sharp, how often you should sharpen them and when to replace them as well as how to sharpen them while they are attached to your mower.
Let's get into it!
First of all, before we get into the process of how to sharpen blades on your mower without removing them, let's cover why it is essential to keep your mowers blades sharp in the first place.
Not only can dull mower blades ruin your grass, but they can harm your mower too, we have gone into some further detail below.
Figuring out when to sharpen your mowers blades can be a little more difficult and will differ depending on the type of blades you have (for example mulching blades need sharpening more often), how often you mow your lawn and the condition of it.
To help you decide when it's the right time to sharpen your blades, we have listed out some typical signs that your blade might need sharpening.
It is possible to sharpen your blades too much, consequences of doing this can mean more strain on your blade and leave it vulnerable to breaking if the blade hits a stone or some tough debris. Your blade should always be at a 40-degree angle of sharpening and never cut your hand when you touch it, otherwise, it is too sharp.
Before we share our step by step guide on how to sharpen your mowers blades, it's a good idea to know when to replace them rather than sharpen them, as sharpening blades that need to be replaced can be dangerous and potentially risk the blade snapping during use.
We have listed out some signs you may need to completely replace your lawnmower's blades below.
Now we have figured out when to sharpen your mowers blades and when to replace them, as well as why it's important to keep them sharp, we can get on to how to sharpen them without having to remove them.
We have put together a short step by step guide for you to follow below so as you can sharpen your lawnmower's blades safely.
To begin with, you should remove the spark plug of your mower to prevent any accidental start-ups and remove the fuel tank lid (providing you have a petrol mower), then place a plastic bag over the petrol tank and put the lid back on.
After you have sealed the fuel tank of your mower you can tilt it over on its side. Always make sure that the carburettor of your mower is pointing upwards to avoid oil and fuel leaking and ensure your mower is in a stable position before starting the sharpening process.
Put a wooden block crosswise under your blade within your mower to keep it stable while you are sharpening, you can then use your wire brush to clean the mowing deck surrounding the blade and the blade itself. Make sure to remove any debris or grass clippings and ensure that the blade is stable enough to not make any movements for your safety.
Start sharpening in the centre of your blade with a flat-file and maintain a 40-degree angle as you sharpen. Always start with the cutting edge of your blade then switch over to the other side once done. Try to make sure the blade is evenly filed on each side to prevent having an unbalanced blade.
Now we have successfully sharpened your lawnmower's blades we can unseal the fuel tank, tilt the mower back up and replace the spark plug.
As you can see above, the process of sharpening your mowers blades without removing them is pretty simple, however, there are some important tips to remember below if you want to sharpen them safely and effectively.
How sharp should my mowers blades be?
Your mowers blades should never be razor-sharp and should be kept at a 40-degree cutting edge.
When should I be sharpening my mowers blades?
On average, you should be sharpening your lawnmower's blades after every 25 hours of use, this could be around 4 times before it reaches the 100-hour replacement mark.
Why do mulching blades need sharpening more often?
Mulching blades make much more contact with grass and debris in comparison to regular mowing blades, causing them to blunt much quicker.
Overall, you can sharpen your mowers blades easily without removing them by using our step by step guide above, just ensure to sharpen your mowers blades after every 25 hours of use. Always remove the spark plug and tip the mower with the carburettor facing up to prevent any accidents.