Replacing a Push Mower Blade. 1 Prep your mower for safety. To keep the motor from accidentally starting, disconnect it from its power source. For gas mowers, remove the ignition wire from the ...

A dull blade damages your grass, so it’s key to sharpen or replace a lawn mower blade regularly. Consumer Reports shows you how to do that task.

Dull mower blades can tear or rip the grass tips, giving your lawn a dried-out and yellowish appearance, says Eric Halfman, lawn equipment go-to-market manager at John Deere.