How to Maintain Your Lawn Mower
Time Required: Under 2 hours
A mower that's not properly cared for will not only have more problems in the short run, but will fail years before a well-maintained mower. A little fast, simple maintenance during the mowing season and before winter can make a huge difference.
Use this guide to learn how to maintain your lawn mower in season and how to prepare it for winter storage.
Tip: Always review your operator’s manual for detailed instructions specific to your engine model.
Tools & Materials
Your mower is a big investment. To ensure it performs up to its maximum, make sure you change the oil at regular intervals. You’ll get better and increased performance, less costly maintenance and longer engine life. Be sure to use oil specially formulated for small engines to keep your engine running at its best.
- Disconnect the spark plugs.
- Use an oil extractor kit to remove oil from the compartment. Be sure to contain and recycle the old oil properly.
- Add new oil to the compartment up to the dipstick fill line.
- Determine if you have paper or foam air filters.
- Check your operator’s manual to determine if air filter pre-cleaner is required. If so, follow the instructions in the manual.
- Replace paper filters when they look dirty (keep a few on hand).
- Plastic foam filters should be removed and washed with warm, soapy water. Air-dry thoroughly, then work about 2 tablespoons of clean mower oil evenly across the filter to lightly coat it.
- Reinstall the filter according to instructions.
- Reconnect the spark plugs.
Be sure to check the air filter a few times during the mowing season, particularly if the mower is getting heavy usage.
- Brush off the mower after each use to keep debris from collecting on the blades.
- A dull mower blade cuts unevenly and shreds the tips of grass blades, which then turn brown and give a lawn a beige cast that makes it look dry. The ragged ends are also entry points for disease. Sharpen the blades regularly to avoid these problems.
Once a year when you change your mower’s oil, replace the spark plug.
- Disconnect the spark plug wire and then remove the existing spark plug with a wrench or pliers.
- To ensure you purchase the right replacement plug, write down the code on your existing plug, consult your mower’s owner’s manual or just take the old plug with you when you go to purchase a new one.
- Screw in the new plug and reconnect the spark plug wire.
A couple of times a year, give the mower a good cleaning.
- With the gas tank empty, turn the mower on its side.
- Remove any debris that may be wrapped around the blade or caked up on the underside of the mower deck.
- Spray the underside of the mower deck hard with a garden hose to loosen dirt and dried-on grass.
- Scrub with a soft brush and soapy water. Then rinse.
- Dry the mower thoroughly before storing.
- After you’ve used the mower for the last time at the end of the growing season, empty the fuel tank by letting the engine run until it is out of gas. Leave the gas tank empty until spring.
- With the gas tank empty, remove the oil fill cap (if applicable) and turn the mower over to drain the engine oil into a suitable container for recycling.
- If your mower has an oil drain plug, use that instead of turning the mower on its side.
- Refill the engine oil reservoir per your mower manufacturer’s recommendations and then replace the oil fill cap.
Different oil types are best at certain temperatures. Learn which one to choose for your climate.
- SAE 30 - Warmer temperatures, most common oil for small engines.
- SAE 10W-30 - Varying temperature range; this grade of oil improves cold weather starting, but may increase oil consumption.
- Synthetic SAE 5W-30 - Best protection at all temperatures as well as improved starting with less oil consumption.
- SAE 5W-30 - Very cold temperatures.
- Vanguard 15W-50 - Varying temperature range. For continuous use, such as commercial lawn cutting or pressure washing.
When choosing lawn mower oil, use a high-quality detergent oil classified as “For Service SF, SG, SH, SJ” or higher. Do not use special additives. Synthetic oils are an acceptable oil at all temperatures. Use of synthetic oil does not alter required oil change intervals.
MAINTENANCE SCHEDULE & APPROXIMATE CAPACITY
- Oil capacity is typically 15oz or 18oz*.
- Change engine oil every 50 hours or annually, whichever comes first.
- Oil capacity is typically 48oz or 64oz*.
- Change engine oil every 100 hours or annually, whichever comes first.
Sharp blades and a well-cared-for engine will mean your mower keeps humming for years to come. Keep your lawn mower in tip-top shape throughout the year and you’ll maintain your lawn more smoothly.
Get even more advice for lawn maintenance and outdoor DIY projects with our other guides.