Yes, lawn mowers can overheat and catch fire. If a lawn mower overcomes its designed capacity, it can overheat and potentially cause fires. To prevent this from happening, be sure to read the owner's manual carefully and follow all of the manufacturer's guidelines for safe operation. Additionally, be sure to inspect the lawn mower regularly for any signs of overheating, such as excessive heat production or smoke. If you notice any of these signs, do not operate the lawn mower until it is fixed.