How to maintain a lawn mower (2026)
Quick Answer
To maintain a lawn mower, keep it clean, check the blade, air filter and oil regularly, and follow the service intervals in the manufacturer’s manual. Always disconnect the spark plug lead or remove the battery before working on the machine, and stop using it if you notice fuel leaks, unusual vibration, smoke or damaged safety guards.
Safety first
- Disconnect the spark plug lead, unplug the mower, or remove the battery before cleaning, clearing blockages or inspecting the blade.
- Allow petrol engines and hot parts to cool before refuelling, cleaning or storing.
- Never put hands or feet near the cutting area until all moving parts have fully stopped.
- Wear sturdy footwear, gloves and eye protection when inspecting or cleaning the mower.
- Do not use a mower with missing or damaged guards, a damaged cable, a cracked battery case or any fuel leak.
- Handle petrol outdoors or in a well-ventilated area away from flames, sparks and smoking materials.
- If you must tilt the mower, follow the manufacturer’s instructions for the correct direction to avoid fuel, oil or battery-related hazards.
- Stop immediately if the mower vibrates unusually, strikes an object, smokes, or makes abnormal noises.
When to call a professional: Stop and consult a qualified lawn mower technician or competent electrician if you find a fuel leak, damaged wiring or plug, cracked battery casing, missing safety guards, persistent starting problems, unusual vibration after blade inspection, smoke, burning smells, or signs of blade spindle, crankshaft or drive damage. Also use a professional if the manual requires specialised tools or you are not fully confident removing the blade or servicing the engine or electrics safely.
Overview
Good lawn mower maintenance is mostly about routine checks done little and often. After each use, clear grass build-up and look for loose, worn or damaged parts. On a regular schedule, check engine oil where fitted, inspect or replace the air filter, sharpen or replace the blade, and use fresh fuel stored correctly. For cordless mowers, keep battery contacts clean and charge and store batteries exactly as the maker instructs. For electric mowers, inspect the cable, plug, switchgear and guards before use. The right maintenance schedule depends on the mower type, how often you mow, grass conditions and the manufacturer’s instructions. As a practical rule, do a quick visual check before every use, clean the deck after mowing, and inspect service items more thoroughly during the mowing season and before winter storage. Avoid tipping a petrol mower in the wrong direction, as this can cause oil or fuel to enter places it should not. If you are unsure about blade removal, carburettor issues, electrical faults, battery damage or any fuel leak, stop and use a qualified repairer. Proper maintenance improves cutting quality, reduces breakdowns, and helps the mower stay safe to use.
Who this is for
Homeowners and tenants maintaining a walk-behind petrol, corded electric, cordless battery or manual cylinder mower for routine domestic use.
What you’ll need
- manufacturer’s manual
- stiff brush or plastic scraper
- clean cloths
- work gloves and eye protection
- suitable fuel can if using a petrol mower
- correct replacement oil, air filter, spark plug or blade parts if required by the manual
- basic hand tools that fit your mower’s fasteners
- a stable work area
Before you start
Identify your mower type and read the manufacturer’s maintenance and safety instructions first. Make sure the machine is switched off, cool, and isolated from its power source: disconnect the spark plug lead on petrol mowers, unplug corded mowers, and remove the battery from cordless mowers. If you need to tilt the mower, check the manual for the correct direction first.
Step-by-step
- 1
Do a pre-use safety and condition check
Before each mow, inspect the mower for loose fasteners, damaged guards, cracked housings, frayed cables, fuel leaks, worn tyres or wheels, and obvious blade damage. Check that the grass collector and discharge flap fit properly, and make sure the stop controls work freely.
Why: A quick check helps you catch faults before they become dangerous or cause bigger repairs.
- 2
Clean off grass and debris after use
After mowing, brush or scrape grass from the deck, discharge area, wheels, cooling fins and around the height-adjustment mechanism. Wipe the exterior clean and keep ventilation areas clear. Do not wash electrical parts, battery contacts or the engine area in a way that could force water inside.
Why: Built-up grass traps moisture, encourages corrosion, restricts airflow and can affect cutting and engine cooling.
- 3
Check the blade regularly
Inspect the blade for dull edges, bends, cracks, deep nicks or heavy wear. If it only needs sharpening, follow the manufacturer’s method and use the correct replacement parts if the blade must be changed. If you are removing the blade, isolate the power source first and support the mower safely.
Why: A sharp, sound blade cuts cleanly, reduces strain on the mower and gives a better finish. A damaged blade can create dangerous vibration or breakage.
- 4
Inspect the power system for your mower type
For petrol mowers, check the engine oil level before use where applicable, use the fuel type specified in the manual, and replace stale fuel if the mower has been standing. Inspect the air filter and spark plug at the intervals in the manual and replace them when dirty, worn or specified by the service schedule. For corded mowers, check the cable, plug and strain relief for damage. For cordless mowers, inspect the battery casing and contacts, and charge and store the battery as instructed by the manufacturer.
Why: The power system has the biggest effect on reliable starting, smooth running and safe operation.
- 5
Lubricate and tighten moving parts as specified
Check wheel adjusters, folding handles, drive cables and other moving points mentioned in the manual. Tighten any loose fasteners to the manufacturer’s specification and lubricate only where the maker says lubrication is required.
Why: Correctly secured and lubricated parts reduce wear, prevent rattles and help controls work properly.
- 6
Store the mower properly between uses and at season end
Store the mower in a dry, ventilated place away from ignition sources. For petrol models, follow the manual for storage preparation, which may include fuel-related steps and a final clean. For batteries, remove them if the manufacturer says to do so and store them in the recommended conditions. Before the first cut of the new season, repeat the inspection, check service items and test the controls.
Why: Proper storage prevents corrosion, fuel problems, battery damage and hard starting after long periods of non-use.
Why this works
Lawn mowers fail most often because dirt builds up, blades become damaged or blunt, fuel or batteries are poorly managed, or wear goes unnoticed. Regular inspection and cleaning reduce stress on the machine, while timely servicing keeps the cutting and power systems working as intended.
Common mistakes to avoid
- Working on the mower without disconnecting the spark plug, unplugging it or removing the battery
- Tipping a petrol mower without checking the manufacturer’s instructions
- Using stale petrol or the wrong fuel
- Ignoring unusual vibration, which can mean blade or crankshaft damage
- Washing the mower so aggressively that water gets into bearings, electrics or the engine
- Continuing to use a mower with damaged guards, cables or battery casing
Troubleshooting
Mower starts poorly or not at all
Check the correct start procedure in the manual first. For petrol mowers, confirm fresh fuel, correct oil level where applicable, and inspect the spark plug and air filter. For cordless models, charge the battery and clean the contacts. If it still will not start, use a qualified repairer.
Uneven or ragged cut
Inspect the blade for bluntness or damage, clean the underside of the deck, and make sure all wheels are set to the same cutting height.
Excessive vibration
Stop using the mower immediately. Check for a damaged, bent or loose blade and any loose hardware. If vibration remains after obvious issues are addressed, have it professionally inspected.
Engine smokes or smells strongly of fuel
Stop the mower and let it cool. Check whether it was tipped incorrectly, overfilled, or leaking fuel or oil. Do not restart a leaking mower; have it inspected by a qualified technician.
Corded mower trips power or cuts out
Inspect the cable, plug and extension lead for damage and make sure you are using equipment suitable for outdoor use. If there is any sign of electrical damage or repeated tripping, stop and consult a qualified electrician or mower repair professional.
Compare your options
Petrol mower
Best for: Larger areas and places far from a power supply
Pros: Strong runtime independence, no mains cable, widely serviceable
Cons: Needs fuel management, more routine servicing, more noise and exhaust emissions
Corded electric mower
Best for: Smaller lawns near the house
Pros: No fuel, generally simpler routine maintenance, lighter than many petrol models
Cons: Cable management is critical, depends on a suitable outdoor power supply
Cordless battery mower
Best for: Small to medium lawns where you want less noise and no cable
Pros: No fuel, convenient, lower day-to-day maintenance
Cons: Battery care matters, runtime depends on battery condition and capacity
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Petrol mower | Larger areas and places far from a power supply | Strong runtime independence, no mains cable, widely serviceable | Needs fuel management, more routine servicing, more noise and exhaust emissions |
| Corded electric mower | Smaller lawns near the house | No fuel, generally simpler routine maintenance, lighter than many petrol models | Cable management is critical, depends on a suitable outdoor power supply |
| Cordless battery mower | Small to medium lawns where you want less noise and no cable | No fuel, convenient, lower day-to-day maintenance | Battery care matters, runtime depends on battery condition and capacity |
Alternatives
- Book an annual professional service if you do not want to sharpen blades or inspect engine and electrical components yourself
- Use a manual cylinder mower for a very small lawn if you want minimal motor maintenance
Pro tips
- Keep a simple maintenance log with dates for cleaning, blade work and part changes
- If you hit a stone, root or hidden object, stop and inspect the blade and deck before mowing again
- Use only replacement parts and consumables approved for your exact mower model
- A clean underside and a sharp blade usually improve cut quality more than repeated height adjustments
Legal & regulatory notes
Follow local rules for fuel storage and disposal of petrol, oil, batteries and electrical equipment. In the UK, outdoor electrical equipment should be used with suitable outdoor-rated leads and in line with the manufacturer’s instructions; repairs to plugs, cables or internal electrics should be carried out by a competent person.
What this guide does not cover: This guide covers general routine maintenance for domestic lawn mowers only. It does not provide model-specific blade removal instructions, exact service intervals, fuel or oil specifications, carburettor adjustment, internal engine repair, battery repair, electrical testing procedures or legal advice for commercial equipment use.
Cost considerations
Routine maintenance usually costs far less than repairing a neglected mower. The main ongoing costs are consumables such as blades or sharpening, filters, spark plugs, oil where applicable, and occasional battery replacement for cordless models. Paying for periodic professional servicing can be worthwhile if it prevents engine, drive or electrical faults.
Prefer to hire a professional?
If this job is beyond a confident DIY — or the work needs to be done by a licensed professional — you can find a verified landscaper or builder through Trade Directory (tradedirectory.co.nz), New Zealand's directory of real, verified trade businesses. Compare local tradespeople, read their details and request quotes before you commit.
Find a landscaper or builder on Trade DirectoryFrequently asked questions
How often should I sharpen the mower blade?+
There is no single interval that suits every mower. Check the blade regularly during the mowing season and sharpen or replace it when the cut becomes ragged, the blade is visibly dull, or you strike debris. Follow the manufacturer’s guidance for your model.
Can I hose down my lawn mower?+
Usually it is safer to brush or scrape off debris rather than force water into the mower. Some manufacturers allow limited washing of certain areas, but you should follow the manual exactly, especially for petrol engines, bearings, batteries and electrical components.
How do I know if fuel has gone stale?+
If a petrol mower has been left unused for a long period and then starts badly, runs unevenly or will not start, stale fuel may be a factor. Follow the manual for the correct storage and fuel-handling procedure for your engine.
Do electric and battery mowers need less maintenance?+
They usually need less engine-related maintenance because there is no petrol system, but they still need regular cleaning, blade checks, guard inspection, and careful cable or battery care.
Should I change the oil myself?+
Only if your mower has an engine oil service requirement and the manual explains the procedure clearly. Use the exact oil type and method specified by the manufacturer. If you are unsure how to dispose of used oil or perform the change safely, use a professional service.
Sources & references
Guidance on this page is traced to documented sources. Last checked 24 September 2026.
- STIHL - Lawn mower maintenance · manufacturer
Supports the general principle of regular cleaning, blade inspection and following manufacturer instructions for servicing and storage. Exact maintenance procedures vary by model.
Core maintenance principles stay fairly stable, but exact service procedures and battery or engine requirements vary by mower model and manufacturer.