How to Change Robot Mower Blades: 7 Easy Steps (2026)

7 min read by Jordan Ellis Updated November 11, 2026

How to change robot mower blades: switch the mower off completely, turn it upside down on a soft surface, remove each blade and its screw, fit a new blade with a new screw, and check that it spins freely. The exact steps depend on whether the mower uses disc or star blades, and the replacement interval changes by blade type, so start by checking your manual.

The short answer

Power off the mower fully, wear gloves, and turn it over on a soft surface.
Swap each blade with a new screw, one blade per screw.
Check that every blade pivots freely before you set the mower down.
Reset the blade usage timer in the app if your model has one.

How often to change robot mower blades

Blade life depends on the blade type and on how often the mower runs. Husqvarna gives the most specific interval we found from a robot mower maker: main disc blades last 3 to 6 weeks under normal conditions, and EdgeCut disc blades last 9 to 12 weeks. Robomow’s guidance is looser, advising a new set of disc blades every 2 to 3 months and inspecting them about every two weeks.

Blade type	Typical interval	Source
Main disc blades (Husqvarna)	3 to 6 weeks under normal conditions	Husqvarna support
EdgeCut disc blades (Husqvarna)	9 to 12 weeks	Husqvarna support
Disc blades (Robomow)	Every 2 to 3 months	Robomow blog
Star blades (Robomow)	Often once per season	Robomow blog

Our reading is that for most owners, knowing when to change blades matters more than the calendar, which is only a starting point. Husqvarna says frayed or whitened grass tips after mowing are a sign the blades are due, whatever the schedule. It also notes that worn blades can cause uneven cuts and higher battery and energy use. Robomow advises replacing blades when the cutting pattern deteriorates or the mower gets noticeably louder, and it recommends a visual check about every two weeks either way.

Husqvarna lists what wears blades faster: frequent mowing, larger lawns and tougher grass, fast seasonal growth, sandy soil, some fertilisers, and contact with toys, stones, twigs and roots. Use our robot mower maintenance checklist to fit the inspection into a routine.

Tools and parts you need

You do not need a workshop to learn how to change robot mower blades. Husqvarna’s steps call for gloves, a screwdriver, a soft cloth, and a brush for dirt. Robomow says disc blades usually need only a screwdriver or a manufacturer-specific tool, and star blades often need no tools at all. Use new screws each time, and use original replacement blades and screws where possible. Because blades are extremely sharp, cut-resistant gloves for blade changes are worth a look, and our guide to universal robot mower blades explains the aftermarket option. Robomow adds that resharpening is often not worth the time, since a grinding tool is usually not included and new blades are usually not very expensive.

Close-up of a hex driver bit next to a single small screw on a wooden workbench — A driver and a new screw are the basic tools for most blade changes.

How to change robot mower blades, step by step

Here is how to change robot mower blades in general terms. The procedure is similar across most brands. Always follow the safety and replacement instructions in your own manual, since model details vary. That is the short version of how to change robot mower blades; if your manual differs, the manual wins.

Hands fitting a new blade to the cutting disc of an upside-down robot mower, with spare blades and screws on a cloth — Each blade goes on its own new screw.

Switch the mower off completely. Husqvarna notes that on some models you turn the jogwheel to the “Power off” prompt, while others use an ON/OFF button on the back or bottom.
Put on gloves and turn the mower upside down. Use a clean, soft surface to protect the cover. Blades are extremely sharp.
Line up the skid plate hole with the blade screw. On Husqvarna models, turning the skid plate lets you reach each screw.
Remove the old blade and its screw. Brush off dirt and clean the disc with a damp cloth if needed (see how to clean a robot mower for the rest of the underside).
Fit the new blade with a new screw. Use one blade per screw, and do not reuse the old screw.
Repeat for every blade. Replace the full set together where possible, since mixing new and old blades can cause imbalance.
Check the fit. Each blade should pivot freely. Husqvarna describes this as a safety feature, because the blade swings away when it hits an obstacle.

Disc vs star blades

Disc blades are the common type on many robot mowers and usually fit to a central disc with a screw. Knowing how to change robot mower blades starts with knowing which type you have, because the tool you need follows the blade design, and the choice between single-blade and dual-blade robot mower designs changes what you will be replacing. Robomow says the screws should be tightened just enough that the blades still move freely. Star blades are different: you press the tabs in the middle of the blade together to release it, insert the new blade, and check that it clicks into place.

Heads up

Careful work matters when you change robot mower blades, because Robomow says disc screws that are not tightened correctly can let the blades dislodge. Tighten them only enough for the blades to move freely, and do not reuse old screws.

Reset the blade timer and check your work

Many app-connected mowers keep a count of blade usage, so the reset is the last step of how to change robot mower blades on those models. On Husqvarna models, the blade life counter restarts when you reset it in the Automower Connect app. The path is More, then Statistics, then Blade Usage, and tap Reset under the usage hours. After that, the app tracks operating hours from the new blades.

Once the new blades are on, run a quick check before you let the mower out. Confirm that every blade moves freely and every screw is tight enough to hold but not so tight that the blade cannot pivot. If anything feels loose, stop and recheck before you run the mower again.

Common mistakes to avoid

If you are learning how to change robot mower blades, most avoidable problems come from a few habits. Husqvarna warns against reusing screws, because they can loosen during operation. It also advises against mixing blade types or combining new and old blades. Skipping the spin check is the third common mistake, since a blade that does not pivot freely is a sign something is wrong.

Reusing old screws. Replace them every time you change blades.
Mixing blade types. Use the blade type your model is designed for.
Turning the mower over while it is still on. Switch it off first.
Ignoring spring sap. Husqvarna says sap can build up in spring, so inspect and clean blades more often.

Frequently asked questions about changing blades

How often should I change robot mower blades?

Husqvarna gives 3 to 6 weeks for main disc blades and 9 to 12 weeks for EdgeCut disc blades under normal conditions. Robomow advises replacing disc blades every 2 to 3 months and star blades about once per season. Check your blades regularly and replace them sooner if the grass tips look frayed or the cut looks uneven.

Do I need special tools to change robot mower blades?

Usually not. Knowing how to change robot mower blades with basic tools is enough for most models. Disc blades typically need a screwdriver or a manufacturer-specific tool, and Robomow says star blades often need no tools at all. Husqvarna also recommends gloves and a soft cloth.

Can I reuse the blade screws?

No. When you change robot mower blades, new screws are part of the job. Husqvarna says to replace the screws each time you change blades, because reused screws may loosen during operation. Robomow also advises new screws for each change.

Do I have to change all the blades at once?

Husqvarna’s steps say to repeat the process for all blades and warns against combining new and old blades or mixing blade types, which can cause imbalance and vibration. Replacing the full set together is the safer choice.