Lawn mower blades can be subject to wear and do not always stay sharp. This means that they will need to be replaced from time to time. Fortunately, changing the blades is not too difficult. Just follow these easy steps: * Safety First: To avoid serious injury, make sure the cord is not plugged in and empty the gas tank of the gas mower. We also recommend that you disconnect the spark plug, as a safety measure. * Remove Bolts: Use a socket wrench to remove the blade mounting bolts, then the blade itself. Remember to pay attention to how each blade has been positioned so that you can reassemble the new blade in the same way. * Install the new blade – You can purchase new blades at hardware stores or home improvement services. You may want to take the old blade with you so you can compare blades to make sure you buy the right ones. In some cases, you can recover dull blades by sharpening them. Install the new blades, position them the same as the old ones, then reassemble them accordingly, tightening the bolts in place. * Before using the mower to cut grass, make sure that all the blades have been positioned correctly and that they are not wobbling in their housing. * Wait at least one hour before using the mower – Once you have replaced the blades, return the mower to the upright position. If equipped with a fuel engine, it is best to wait at least an hour for the fuel to return to the engine. You can then continue mowing and monitor the performance of the blade.