- Performing a few minor maintenance procedures on your lawn mower can add life to your mower and prevent problems from developing. Doing a yearly tune-up is recommended. This requires changing the spark plug as well as replacing both the air filter and the oil. Check the plug for any signs of wear and change it if necessary. Inspect and tighten every bolt on your lawn mower. Change the oil for all four-cycle engines at the start of each new cutting season. First, run the lawn mower for two minutes to warm the oil. Drain out the old oil. Add the manufacturer's recommended type and quantity of oil. If the air filter is paper, replace it. If it is foam, clean it or replace it if necessary.
- Lawn mower blades require regular maintenance. Sharpen the blades once or twice a month during the season. Remove the spark plug first for safety reasons. Take out the nut holding the blades in position. Remove blades cautiously. Number the blades for easy replacement. Use a file sharpener or grinder on the blade. Hold it angled and trace the previous cut carefully. Check the balance on each blade using a plastic balancer. Insert the blades back into position on the lawn mower. Replace the nut and spark plug.
- Repairing a mower tire may be required. Secure the mower in place to stop it from moving. Lift the tire slowly. Carefully remove the boot cover on top of the spindle. Take out the "C" clip holding the lawn mower tire in position. Pull frontward to take the tire off. Repair the tire if possible or purchase a new one. Put the tire back in place. Insert the "C" clip and carefully replace the boot cover. Lower the lawn mower when finished.
