Why do I need to sharpen my lawn mower blade? When you mow your lawn with a dull lawn mower blade, the grass doesn’t cut. It tears. The jagged edge of a torn grass blade allows diseases to enter the ...

After gathering everything you need, disconnect your mower’s power source. If you have a gas-powered mower, remove the spark plug. If you have a battery-powered mower, remove the battery. With a gas ...