A lawn mower mechanic works on small engines and other components in mowers. You repair malfunctioning mowers and perform maintenance tasks, such as seasonal tune-ups. As a lawn mower mechanic, you run diagnostic tests to determine the problem and define maintenance needs. You may also perform duties like sharpening mower blades. You replace parts and refill liquids and lubricants as needed. Your responsibilities always include testing the machines that you repair. Depending on where you work, you may perform lawn mower maintenance on a seasonal basis and work with other small engine-powered equipment at different times of the year.