How to Replace a Lawn Tractor Blade

How to Replace a Lawn Tractor Blade Banner

Learn how to replace a lawn tractor blade on your lawn tractor.

A sharp lawn mower blade is important to ensure a quality cut. A dull blade will just beat your lawn into submission.

Is it time to replace your lawn mower blade?  If your grass has brown tips after you mow it is time to sharpen or replace your blade.

Today we will show you how to replace the lawn mower blade on your lawn tractor.

Tools Required:

  • Safety Glasses
  • Gloves
  • Ratchet Wrench with correct sized socket
  • Putty Knife
  • Needle Nosed Pliers
  • Torque Wrench
  • Block of word or Blade Lock

Step 1:

Park the lawn tractor on a flat level surface.

Step 2:

Set the parking brake.

Step 3:

Remove the key from the ignition switch.

Step 4:

Raise the hood and disconnect the spark plug wire(s).  If you have a dual cylinder engine disconnect both spark plug wires.

Unplugging the spark plug wire(s) prevents the mower from accidentally starting and chopping your little toes off.


Step 5:

Lower the lawn mower deck to the lowest position.

Step 6:

Disengage the lawn mower deck.

Step 7:

Remove the lawn mower drive belt from the engine pulley.

Step 8:

On the left side of the lawn tractor, remove the bow tie clip from the left rear lift arm and disengage the lift arm from the mower deck.

Step 9:

On the right side of the lawn tractor, remove the bow tie clip from the right rear lift arm and disengage that lift arm from the mower deck.

Step 10:

At the front of the lawn tractor, remove the clip holding the front suspension arm to the front of the mower deck.

Step 11:

Turn the front wheels to the left to make it easier to slide the mower deck out from under the lawn tractor.

Step 12:

Raise the mower deck lift lever to it’s highest position. This moves the lift mechanism out of the way.

Step 13:

Slide the mower deck out from under the tractor.

Step 14:

Disconnect the engagement lever cable from the mower deck.

Step 15:

Flip the mower deck upside down to gain access to the blades.

Step 16:

With gloved hands, hold the blade with one hand and use a wrench to loosen the blade bolt with the other. If the blade bolt is extremely tight or rusted, you can wedge a block of wood between the blade and the mower deck to secure the blade. Or use our handy blade lock lawn mower blade holder.

Step 17:

Once the blade(s) are removed use a small putty knife to remove any grass buildup from the underside of the mower deck.  Grass buildup with cause your lawn mower deck to prematurely rust.  If you mower deck rust through it most likely cannot be repair and the cost of replacing the mower deck is almost equal to the price of a new lawn tractor.

Step 18:

Once the underside of the mower deck is sparkling clean, it’s time to install the new blade(s).  Typically, the blade(s) will be stamped with either, “This side up” on the top or with “Bottom” or “Grass side” on the bottom. The mandrel shaft that the blade attaches to has a special pattern. The blade has the same pattern. The pattern in the blade(s) has to fit onto the pattern on the mandrel.

Once you have the blade(s) on the mandrel, hold the blade with one hand. Then thread the blade bolt with the other. Holding the blade with a gloved hand, tighten the blade bolt with a torque wrench. The blade bolt should be tightened between 45 foot pounds minimum and 55 foot pounds maximum.

Step 19:

Slide the mower deck under the tractor and re-attach the lawn mower deck in the reverse order in which it was removed.

Step 20:

Now reconnect the spark plug wire(s) and lower the mower deck to the desired cutting height and your lawn tractor is ready to mow again.

That’s all it takes to replace the lawn mower blade(s) on your lawn tractor.


You can order a new blade(s) online by visiting or calling 1-866-563-9925 (Toll Free). Be sure and have your exact model number, inluding dashes, periods and special characters.  We’ll need the complete number to ensure you get the correct parts.

– Jack

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Jack Hayes
About Jack Hayes 75 Articles
Jack Hayes is the Head of Internet Marketing at LawnMowerPros and the editor of this blog. You can often find him creating featured articles, DIY guides, custom graphics and much more.