Make these maintenance tasks part of your regular seasonal garden maintenance routine to ensure you don't overlook them.
1. Replace the Spark Plug
Before you begin any lawn mower maintenance, remove the spark plug. This ensures your safety as the lawn mower cannot accidentally start.
Lawn mower spark plugs degrade rapidly. They are vital to the engine's functioning, but thankfully they're inexpensive, too. They're also easy to change. Simply grab the wrench, remove the old spark plug, and replace it with a new one. Just remember not to overtighten it to avoid any problems with starting the mower.
2. Change the Oil
While you don't necessarily need to change the oil in your mower unless it's showing signs of being contaminated or too old and viscous, it's a good habit to develop. At the end of each season and before you put the mower up for the winter, remove the drain plug beneath the oil tank on the mower and allow the oil inside to drain.
Some lawn mowers don't have drain plugs, in which case you'll need to turn the lawn mower on its side and allow it to drain the oil via the fill hole.
Once the oil tank is empty, sit the lawn mower the right way up or replace the drain plug. You can then refill the tank with the correct type of oil. Check your owner's manual if you're unsure of which time the oil is suitable for your machine.
3. Drain the Fuel Tank
If your lawn mower won’t start, the culprit could be old gas. Leaving gas in the tank can also damage, and eventually corrode, the fuel tank. Therefore, at the end of each season, you'll need to either use up or drain all of the remaining fuel in the tank. If you choose to drain and dispose of old gas, remember that you are dealing with an extremely volatile and flammable substance, so take all sensible precautions. Leave the fuel tank empty over the winter, and add new gas in the spring.
4. Clean the Mowing Deck
You should get in the habit of cleaning the mowing deck each time you finish cutting the lawn. Cut grass, dirt, and debris get caked onto the area above the blades, known as the mowing deck. Once it dries, it becomes incredibly hard and difficult to remove. It also traps heat, which can eventually cause your lawn mower's engine to overheat. Plus, it can potentially block the discharge chute.
After you finish mowing, disconnect the spark plug, turn the lawn mower on its side, and use a wire brush to remove all of the grass clippings and debris that accumulated during the mowing session. Doing this after each cut makes it far easier, as the clippings are still wet and easy to remove.
At the end of the growing season, you should do a more thorough cleaning of your mowing deck. Remove the spark plug and flip the mower over onto its side (carburetor-side up). Remove all accumulated debris from the mowing deck, then give it a thorough clean with a stiff brush and some hot soapy water. Allow the mowing deck to dry while you're doing the other end-of-season lawn mower maintenance tasks, then give the deck and blades a lubricating coating to prevent rust. Then you can put the mower away for the winter.
5. Replace the Air Filter
Like spark plugs, air filters are inexpensive but crucial to the performance and efficiency of your mower. At the end of each season, it's a smart idea to change your air filter if you have a removable one, or thoroughly clean the filter if you have a permanent one. A new or clean air filter significantly improves the efficiency of your lawn mower and decreases the demand placed on the engine. You'll need to check your owner's manual to see how to change the air filter on your specific mower model.
6. Check the Carburetor
The carburetor needs cleaning approximately every two years. A dirty or underperforming carburetor results in a noticeable drop in performance, and eventually stops the lawn mower working altogether. Dust, dirt, and debris can clog the internal and external parts of the carburetor, which slowly decreases performance.
While cleaning the carburetor isn't particularly difficult, it's best to let a pro handle this part for you if you're not comfortable or don't know your way around an engine.
7. Sharpen and Balance the Blades
Having sharp, well-balanced blades ensures your lawn mower performs well and your grass stays healthy. Even if you have no nicks in the blade, and your lawn is relatively free of sticks, stones, and other debris, the blades do wear down and get blunt. Damaged or blunt blades tear the grass rather than cutting it cleanly, causing extensive damage, and leaving your grass at greater risk of disease and poor health. Sharpening your mower blades is one of the easiest ways to keep your lawn lush and green.
With a little know-how and experience, you can sharpen your own blades with a vice and a metal file or rotary tool, or a specific blade-sharpening tool. However, if you don't know what you're doing, you can cause further damage to the blades and, therefore, your grass. So, it may be a good idea to take the mower to a repair shop or hire a mobile mower servicing company.
8. Fog the Engine
Fogging a lawn mower engine involves removing the outer plastic shell or engine housing and spraying fogging oil into the carburetor and inside the spark plug. This provides a waxy, protective coating that limits the risk of moisture getting inside the engine and causing issues.
9. Check the Tires
Before and after each use of your mower, it's good practice to check the tires. Whether you have a ride-on mower with inflatable tires or a self-propelled mower with hard tires, it's important to check that they remain in good condition. Even with molded wheels, if they’re chipped or significantly damaged, they can impair the performance and balance of your mower.