Step 1 – Remove the deck from the mower
First, you will need to remove the mower deck from your mower in order to get to the blades.
How you remove the deck will depend on the type and style of mower you own. If in doubt, consult the manual.
Step 2- Remove the blade from the deck
Turn the mower deck (which houses the cutting blades) to get to the blades.
It simply secured most with a large nut in the center.
Place a piece of wood between the side wall of the deck and the blade to prevent the blade from rotating while removing. Use the sockets to loosen the nut.
Once the nut is off, lift the blade up to remove it.
Step 3 – Examine the blades
Examine the blade to make sure it is not bent. If the blade is bent, you should not attempt to repair, sharpen, or reuse it.
Once it is bent, it is scrap. If the blade is used bent or unbalanced, this will disturb the continuity of the blade rotation, which will misalign the entire cutting mechanism.
This can increase the vibration in your machine and can ultimately ruin your lawn mower.
Step 4 – Sharpen the blades
Secure the blade to a sturdy workbench with C-clamps or a bench vise.
You can use an angle grinder to remove large nicks or gouges in the metal, but be careful not to over grind the metal.
Ultimately, you need to put the trim on hand. Using a large utility file, run the file in long, even strokes along the edge of the blade.
Count your strokes, hitting the same number of strokes on each side.
Step 5 – Check the balance
You will need to check the balance of the blade to make sure one side is not heavier than the other.
If the blade is out of balance, this can damage your mower. You can attach the blade to a shank or the handle of a screwdriver.
If you lean to the side, hit a few more hits to the heavier side, check your balance frequently to regain your balance.