Replace the Blade on Your Walk-Behind Mower
Over time, the blade on your walk-behind mower can get worn, bent, or dinged. A dull or damaged blade can make mowing tougher and leave your lawn looking uneven. Keep your mower cutting clean by checking, sharpening, or replacing the blade regularly.
How often should you check?
At least twice a year — once at the beginning of mowing season and again mid-season (or more often if you mow year-round).
Step 1 – Prepare your mower for maintenance
Place your mower on a flat, level surface. Turn the mower off and let the engine cool completely. Disconnect the spark plug wire and remove the key (if equipped). This ensures the machine won’t start accidentally while you’re working on it.
Pro tip: Always wear gloves when working near sharp blades.
Step 2 – Remove the fuel
You’ll need to tip your mower on its side to access the blade, so remove or drain the fuel first to prevent spills. You can either run the mower until it’s empty or use a siphon pump to transfer the fuel into an approved container.
Step 3 – Turn the mower on its side
Gently tip the mower on its side with the air filter facing up — this prevents oil from leaking into the air filter or fuel tank.
Step 4 – Remove the blade
Wear gloves for safety. Use a block of wood or a blade removal tool to keep the blade from rotating. Then, use a wrench or socket to loosen and remove the blade bolt. Be sure to note the order and direction of the blade hardware — you’ll need it when reinstalling.
Step 5 – Replace the blade
Position the new (or sharpened) blade exactly as the old one was. Tighten the bolt securely according to your owner’s manual specs. The side of the blade marked “Bottom” or the part number should face the ground.
Step 6 – Turn the mower upright
Carefully set your mower back on its wheels, keeping everything level.
Step 7 – Reconnect your spark plug wire
Once the blade is secure and the mower is upright, reconnect the spark plug wire — you’re ready to mow again!
