Lawn Mower Maintenance tip-blades involves sharpening your mower blades. In the case of sharpening a push mower blade you will need to tip the mower on its’ side as we did when we removed the oil plug to allow for the oil to drain from the bottom of the mower.
You will also need to remove the spark plug wire from the spark plug and put the plastic gasket between the gas tank and the cap to prevent gas from escaping through the gas cap vent. To remove the blade I just use a thick work glove to hold the blade in place and with my ratchet and socket I loosen and remove the blade bolt or bolts. Most bolts are 9/16” sockets but you will have to experiment to find out.
Remember that old saying “Lefty loosey, Righty tighty” which means turn the socket to the left to loosen the bolt and turn it to the right to tighten the bolt. Once the blade is off inspect it for any major nicks or chips and to make sure it isn’t bent. To check to see if it is bent set it on a surface that you know to be flat and level. Check for any gaps between the blade edge and the flat surface.
If it is bent then it will not want to sit flat on the table, also by holding the blade carefully and looking down the blade you may be able to notice the far end of the blade is pointing down to the ground or up towards the sky more than it should.
It would most likely be bent and need replacing. It is not normally wise to try and straighten this blade as you may be weakening the blade itself.
This weakening may cause the blade to break apart at a later date while you’re mowing your lawn, thus increasing the risk to innocent bystanders or to your mower when this blade breaks apart. If there are only minor nicks then continue to sharpen the blade with a metal file.
I cases where the end of the blade is worn out then replace blade with exact same size. If you don’t have a parts manual for the mower take the blade with you to your local lawn mower parts dealer and have the match the blade for you. You don’t want one that is smaller as it will not fit the mounting bolt pattern on the under side of the deck.