What To Do If Your Lawn Mower Is Overheating

If your lawn mower suddenly shuts off mid-job and it smells like it's burning, or it feels unusually hot, it's a clear sign something isn't working right. Overheating is one of the more common mower issues, with signs including smoke, rattling, and reduced performance. It can be serious if you don't address it. In most cases, the cause is something simple that you can fix yourself, like changing the oil, sharpening the blades, and removing clumped debris. 

Understanding why it happens is the first step to getting your mower back in shape. Dirty or low oil, airflow issues, and clogs can all be fixed with some basic mower maintenance and tips to prevent lawn mower damage. The oil in your mower lubricates the engine parts, reducing friction. Without enough oil, the parts can rub against each other, generating heat. Worn or slipping belts create a burning smell. You might also have airflow problems when grass clippings, dirt, and debris get into the mower and clog cooling fins or air vents. The blockage prevents heat from escaping. 

There are mistakes everyone makes when mowing the lawn, like mowing in the wrong conditions. Thick, wet grass or mowing on an extremely hot day can force your mower's engine to work harder, increasing the risk of overheating. Also, old fuel and spark plugs can cause issues where the engine runs hotter than normal. Before calling for help, there are several fixes you can try yourself, including cleaning your lawn mower's cooling system.

Turn your lawn mower off immediately so that it can cool down. Doing this step first prevents damage and keeps you safe while you inspect it. It's also a good idea to grab your owner's manual, as it could come in handy for the next steps. Next, check the condition and level of the oil, and if it's dark or dirty, replace it. Fresh oil can make a big difference in the engine's temperature. If it's low, top it off carefully. If the air filter is dirty, pull it out and clean it. Foam filters can be washed, but paper filters need to either be replaced or brushed off after a few uses to restore proper airflow.

Examine and clear out the mower deck, cooling fins, and engine housing. Remove the engine cover and, if needed, the tank to check inside. You'll want to get rid of any dirt, grass clumps, or dust that may be trapping in heat. Check the cutting height and adjust if needed — having it set too low could be the cause of your overheating problem. Look to see if the belts are loose or damaged as well as the spark plugs, and replace them if necessary. Also, make sure the blades are nice and sharp. Finally, adjust when and how you mow. Avoid cutting wet, thick grass, mow when it's cooler out, and give your mower breaks.

After all of this, if you notice your mower is still overheating, it may be time to call in a professional. It's possible that something more serious is going on. The cooling fan could be damaged, you might have a leaking or blown gasket, or even severe internal engine wear.