How to Replace a Lawn Tractor Blade

 

Learn how to repace a blade on your lawn tractor in this video from Sears PartsDirect. Sears PartsDirect has step-by-step lawn tractor repair guides and answers to riding mower and tractor common questions.

How to replace a lawn tractor blade

Keeping a sharp mower blade is important to ensure a quality cut. Today we will show how to replace the blade on your riding lawn tractor. You can order the new blade online by visiting SearsPartsDirect.com or by calling 1-800-252-1698. Write down the exact model number from your tractor, including dashes, periods and other characters. You’ll need this complete number to ensure that you order the correct parts.

This job can be done by most owners using basic hand tools. You will need safety glasses, gloves, a ratchet wrench with the correct-sized socket, a small putty knife, a needle nosed pliers and a torque wrench to tighten the blade bolt. You may also need a block of wood 4x4 inches.

First, park the tractor on a level surface and set the parking brake. Next, remove the key from the ignition switch. To eliminate any chance of the engine starting, raise the hood and remove the spark plug wire and tuck it away from the spark plug. To gain access to the blades, the mower deck should be removed from under the tractor.

Lower the mower deck to the lowest position. Make sure the mower deck is disengaged. Remove the mower drive belt from the engine pulley. On the left side of the tractor, remove the bow tie clip from the left rear lift arm and disengage the lift arm from the mower deck. Then go the right side of the tractor and remove the bow tie clip from the right rear lift arm and disengage that lift arm. At the front of the tractor, remove the clip holding the front suspension arm to the front of the mower deck.

Turn the front wheels to the left to make it easier to slide the mower deck out from under the tractor. Raise the mower deck lift lever to the highest position. This moves the lift mechanism out of the way. Slide the mower deck out from under the tractor. Disconnect the engagement lever cable from the mower deck. Turn the mower deck upside down to gain access to the blades. If the bolt is extremely tight or rusted, you can wedge a block of wood between the blade and the mower deck to secure the blade. With gloved hands, hold the blade with one hand and use a wrench to loosen the blade bolt with the other.

Once the blade is removed use a small putty knife to remove any grass buildup from the underside of the mower deck. Once the underside of the mower deck is clean, it’s time to install the new blade. The blade 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 star pattern. The blade has the same pattern. The star in the blade has to fit onto the star on the mandrel.

Once you have the blade on the star, 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. Slide the mower deck under the tractor and re-hang the mower deck in reverse order in which it was removed. Now reconnect the spark plug wire. Lower the mower deck to the desired cutting height and your tractor is ready to mow again. That’s all it takes to replace the blade on your Craftsman tractor.