How to Install a Lawn Mower Blade

Virtually every lawn mower comes equipped with a lawn mower blade. When the blades are removed for sharpening or replacement, they will also must be reinstalled. Both riding lawn mowers and push lawn mowers use similar types of sharpened steel blades, and they are also mounted in virtually the same way as well. Regardless of your type of lawn mower, the same installation guidelines apply.

Things You'll Need

  • Washer
  • Lawn mower blade-mounting bolt
  • Wrench or applicable ratchet with socket

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Flip your push mower up and on its side. A riding mower can either be jacked up off the ground for clearance, or the mower deck can be removed and flipped over for unlimited access.

Place the blade over the mounting hole at the center of the deck. The beveled or sharpened side of the blade faces the deck proper, while the unsharpened or straight side faces outward toward you.

Place a separating washer over the hole; in many cases, this will be a lock washer to keep the bolt snugly in place.

Thread your blade-mounting bolt through the holes of both the washer and the blade, and hand-tighten it into the blade-mounting hole.

Tighten the bolt firmly with the appropriate-size wrench or ratchet and socket.

Tips & Warnings

  • A little spray lube in the mounting hole will allow you to turn the bolt much easier when you are hand-tightening it.
  • Wear gloves when handling the sharpened ends of the blade.


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