Steps For Changing The Blade On Your Lawn Mower. For the best results when mowing your lawn, you need to ensure that your mower is in good condition. You should especially ensure that the blades are sharp and stable. A bent or dull lawn mower blade will cause you to have bald spots all over your beautiful lawn. If your lawn mower blades aren’t in the best condition, we’ll show you how to change them so that you can get the best mowing results, increase your lawn mower’s fuel efficiency and increase the longevity of your mower. Check out the step to changing them: You need to check out your mower’s blades to see if they really need changing. You may need to sharpen them if they’re dull, but not considerably worn down. However, if your blade is clearly worn out or if it is bent, you would definitely have to get a new one.. Turn the mower off and wedge the wheels or lock the brakes and disconnect the spark plugs.. Put the mower deck at the highest settings so that you can access the blades more easily.. Make sure that surface that you place your mower on can support its weight. Raise the lawn mower up high enough for you to get underneath it. It is recommended that you use a mower or tractor lift to ensure that you don’t have the mower fall on you while you’re working on it.. Make sure that your wrench fits the mandrel nut or bolt and get a cheater pipe or something else that can keep the mower blades stationary while you’re working on removing the nut or bolt.. To remove the mandrel shaft, turn the nut or bolt counterclockwise and then remove the blade.. Go to a hardware store or a lawn mower repair shop with the old blade so that you can easily match it up to the new blades. Ensure that things like the length, spline, offset and other things match so that your blade will work well within your mower.. Install your blade right side up on your lawn mowers. Retighten the nut or bolt and ensure that the blade fits all the way up onto the spline so that it doesn’t get damaged when you retighten the nut.. Take a look at the different parts of the mower deck to ensure all is well and then lubricate the mandrel and other areas of the mower before your lower it back down.. All you have to do now is clean up the area and you’re all done! You can come to us for help. If you are looking for small engine repair services in Ottawa, mobile car battery boosting, mobile tire changes, or snow blower and lawn mower repairs then give us a call to book your mobile small engine repair today. We repair and tune-up small engines such as lawn mowers and snow blowers. The best part is that we come to you so no more waiting in line or traveling back and forth to fix your small engine equipment.