Disconnect the spark plug wire

Remove the battery if it is a battery-powered mower

Wear heavy gloves

Tilt the mower safely with the air filter and carburetor facing up

Block the blade with a piece of wood

Use the correct wrench or socket to loosen the blade bolt

Turn the bolt counterclockwise to remove it

Remove the blade and any washers or adapters

Note the blade orientation before removal

Clean the mounting area before reinstalling or replacing the blade