After months of winter storage, your lawn mower needs attention before tackling the first cut of the season. Just 30 to 45 minutes of spring maintenance prevents mid-season breakdowns, extends your mower’s lifespan, and saves you hundreds in repairs.
Skipping it costs you more than money. Dull blades tear grass instead of cutting cleanly, creating ragged edges that invite disease. A neglected mower stresses your turf and forces multiple passes over the same area.
Need help getting your lawn ready for spring? Lawn Love can connect you with local lawn care professionals who can handle mowing, fertilization, and seasonal maintenance, so you don’t have to worry about equipment upkeep.
| Key Takeaways |
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| • Spring maintenance takes just 30 to 45 minutes and prevents costly mid-season breakdowns. • Dull blades tear grass instead of cutting cleanly, inviting disease and turning your lawn brown. • Old fuel is the No. 1 reason mowers won’t start after winter. Always drain and replace gas that’s been sitting for more than 30 days. • Test all safety features before your first mow. A blade brake that doesn’t stop within three seconds needs professional repair. |
10-step mower maintenance checklist
Before you pull the starter cord on your mower for the first spring mow, go through this checklist to ensure your mower is safe and ready for the season ahead.
For safety, always disconnect the spark plug wire before performing any maintenance. This prevents accidental starts while you’re working on the mower. Also, always check your owner’s manual for the manufacturer’s recommendation.
1. Inspect and clean the mower deck
Start at the bottom. Flip your mower on its side (air filter up to prevent oil leaks) and scrape away caked grass clippings and debris from the underside of the deck. Use a putty knife or a wire brush for stubborn buildup.
Also, check for rust spots or damage. A clean deck also prevents rust from spreading and makes future cleaning easier. It’s best to clean your mower deck after each use before you put your mower away to protect against rust and save you time later.
2. Check and sharpen the blade
Remove the blade and inspect it carefully. Look for nicks, bends, excessive wear, or cracks. A dull blade has a rounded edge and shows signs of wear on the cutting surface.
How to test sharpness: Slice a piece of paper with the blade. A sharp edge cuts cleanly, a dull one tears or snags. Toro’s blade maintenance experts recommend aiming for the sharpness of scissors rather than a knife edge, which loses its edge much more quickly under normal mowing conditions.
When to sharpen vs. replace:
- Sharpen if the blade has minor dullness or small nicks
- Replace if you see cracks, severe bends, deep gouges, or if more than one-third of the blade material is worn away
Proper torque when reinstalling: Use a torque wrench to tighten the blade bolt to your mower’s specifications. Walk-behind mowers typically require 35 to 50 foot-pounds of torque, while riding mowers need 70 to 90 foot-pounds.
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3. Change or top off engine oil
Check your oil level and condition before starting the season. If it’s dark and gritty, it needs to be changed.
Ken Hinton, owner of Ken’s Mobile Service, Austin, Texas, has an easy way to remember to check the oil.
“I recommend checking the oil level with each fuel fill-up. Oil will not be needed each time, but if you get into this habit, you will always know when the engine requires additional oil,” he says.
Oil type recommendations from Briggs & Stratton:
- SAE 30: Best for warm temperatures above 40 degrees F. Traditional choice for older mowers and warmer climates.
- SAE 10W-30: Works across a wider temperature range (0 to 100 degrees F). Better for spring startups in cooler weather.
- Synthetic 5W-30: Provides the best protection at all temperatures and improves cold-weather starting with less oil consumption.
Skipping oil changes is the No. 1 mistake Hinton sees.
“Air-cooled engines are built with looser tolerances than liquid-cooled engines, and therefore use oil. This is normal. Air-cooled engines will require oil to be periodically added to the engine to prevent the engine from running low or out of oil and causing damage.”
Disposal tip: Never pour old oil down drains or into the ground. Take used oil to an auto parts store or recycling center that accepts it.
4. Replace or clean the air filter
A dirty air filter restricts airflow to the engine, reducing power and fuel efficiency. Remove the air filter cover and inspect the filter.
Foam vs. paper filter maintenance:
- Foam filters: Wash in warm, soapy water, rinse thoroughly, let dry completely, then apply a light coating of clean engine oil before reinstalling.
- Paper filters: Tap gently to remove loose debris. If heavily soiled or damaged, replace it. Never wash paper filters with water.
Among the most common issues Hinton sees: a neglected or missing air filter element.
When to replace vs. clean: Replace paper filters that are torn, heavily soiled, or show signs of oil contamination. Foam filters can usually be cleaned and reused several times before replacement is necessary.
Read more: How to Clean and Replace Your Lawn Mower’s Air Filter
5. Check/replace spark plug
Remove the spark plug and inspect it for fouling, corrosion, or worn electrodes. A plug in good condition will be light gray or tan. Replace it if you see heavy black carbon deposits, oily residue, a cracked insulator, or severely worn electrodes.
Proper gap specification: Most lawn mower spark plugs require a gap of 0.030 inches on most models, according to Briggs & Stratton specifications. Use a gap gauge or feeler gauge to check and adjust the gap if needed. Never adjust the gap on platinum or iridium plugs, as this can damage the fine electrodes.
Typical lifespan: Replace spark plugs every 25 to 50 hours of use or once per season for most homeowners.
Read more: How to Change Spark Plugs on a Lawn Mower
6. Inspect fuel system
Old fuel causes more problems than almost any other maintenance issue. Gasoline begins to degrade after just 30 days, forming gum and varnish that clog carburetors and fuel lines.
Hinton says this is the main reason mowers won’t start after storage.
“If the mower will not start, the majority of the time the issue is going to be carburetor-related due to fuel or fuel residue remaining in the carburetor causing fuel delivery problems,” he says.
Start fresh: If you left gas in the tank over winter, drain it completely before adding fresh fuel.
Check fuel lines: Look for cracks, brittleness, or leaks in fuel lines. Replace any damaged lines immediately.
Clean or replace fuel filter: If your mower has an inline fuel filter, inspect it for debris. Replace it if it looks dirty or restricted.
Add fresh fuel with stabilizer: Fill the tank with fresh gasoline, then add fuel stabilizer according to the package directions. This keeps fuel fresh between uses during the mowing season.
7. Check tire pressure (for riding mowers and self-propelled models)
For riding mowers and self-propelled models, proper tire pressure ensures even cutting height and smooth operation. Underinflated tires cause uneven cuts because one side of the mower deck sits lower than the other. They also make the mower harder to push or maneuver, and can damage the sidewalls.
Check the sidewall of each tire for the recommended PSI and use a tire pressure gauge to adjust as needed. Even a few pounds’ difference between tires affects cut quality.
8. Inspect drive belt and cables (if applicable)
For self-propelled and riding mowers, belts and cables handle power transmission and control functions.
What to look for:
- Fraying, cracking, or glazing on drive belts
- Looseness or excessive play in the belt tension
- Stiff, corroded, or frayed control cables
- Proper engagement of self-propelled drive and blade systems
Test the system: Engage the self-propelled function and blade engagement lever. They should operate smoothly without binding or excessive force.
Lubricate cables if needed: Apply a light spray lubricant to cable pivot points if they feel stiff. Don’t over-lubricate, as this attracts dirt.
9. Test safety features
Safety systems prevent serious injuries. Never bypass or disable them.
Check these critical features:
- Blade brake/engagement system: The blade should stop within 3 seconds after you release the blade control.
- Dead man’s switch: The engine should shut off immediately when you release the operator presence control.
- Blade engagement lever: Should engage and disengage smoothly without sticking.
If any safety feature fails to work properly, have it repaired by a professional before using the mower. These systems are legally required and save lives.
Read more: Essential Lawn Mower Safety Tips
10. Do a test run
After completing all maintenance and reconnecting the spark plug wire, it’s time for a trial run. Start the mower and let it run for 5 to 10 minutes.
Check for vibration: Excessive vibration usually means the blade is unbalanced, bent, or improperly installed. Shut off the engine immediately and recheck the blade installation.
Verify smooth operation: The engine should run evenly without surging or stalling. Blade engagement should be smooth and positive.
If everything checks out, you’re ready to mow for the first time this spring.
If it won’t start, Hinton offers a quick diagnostic: “The easiest way to troubleshoot a mower that will not start is to remove the air filter cover and air filter element and prime the engine with a few drops of good fuel and see if it will start up. If it fires up and continues to run, then you should be good after it runs a few minutes to use up the stale fuel in the carburetor.”
If it starts but stalls? “If it starts and then dies, this tells me that everything needed to run is good, but the fuel flow to the engine is not working and indicates carburetor service or replacement is needed,” Hinton says.
When to call a professional
Some repairs require specialized tools or expertise:
- Carburetor cleaning or rebuilding
- Engine problems like hard starting despite maintenance
- Electrical system issues
- Unusual noises or vibrations that persist after basic maintenance
Hinton says the most expensive preventable repairs he sees come down to two things: engine damage from low or dirty oil, and a missing or dirty air filter. A professional tune-up is far cheaper than replacing an engine.
When you consider the cost of a new mower ranges from $405 for a walk-behind to $3,940 for a riding mower, annual maintenance is a smart investment in your equipment.
Not comfortable handling maintenance yourself? Professional lawn mower service costs range from $25 to $75 for gas push mowers and $100-$250 for riding mowers, saving you time and effort for a price that’s well worth it.
FAQs
After sharpening, hang the blade horizontally on a nail or use a blade balancer tool. A properly balanced blade will stay level. If one end dips down, that side is heavier and needs more material removed from the sail area (the non-cutting end of the blade). An unbalanced blade causes excessive vibration and can damage your mower’s engine bearings over time.
No, you should never try to salvage old gasoline by mixing it with fresh fuel. Gas that’s been sitting for more than 30 days has already begun forming gum and varnish deposits. Mixing old fuel with new just dilutes the problem rather than solving it. Always drain the old fuel completely and start with fresh gasoline and a fuel stabilizer for best results.
For most homeowners, yes. An annual tune-up covering fresh oil, a new spark plug, a clean air filter, and a sharpened blade keeps your mower running efficiently and prevents the kind of buildup that leads to costly repairs. If you mow more than 25 hours per season or have a larger property, you may need to service some components mid-season as well.
Ready, set, mow
Spring mower maintenance takes less than an hour but prevents expensive repairs and protects your lawn from damage all season long. Make this 10-step checklist an annual ritual, and your mower will reward you with years of reliable starts and clean cuts.
If you’d rather skip the equipment hassle altogether, Lawn Love can connect you with local lawn care pros to mow, fertilize, and aerate to keep your lawn green and lush, while you sit back and relax.
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Main Image: Man servicing lawn mower in workshop garage. Image Credit: Anze / Adobe Stock
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