How do I Change 112-0315 Blades on a Toro LX420 Lawn Tractor?

Written by james j. siegel
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An important part of maintaining a riding lawnmower is making sure that the cutting blades are in good working order. Like any other blade, the blades on a lawnmower can get old and worn down, which can cause poor and uneven cutting. If you have a Toro LX420 lawn tractor, the blades can be removed like the blades in many other riding mowers.

Skill level:

Things you need

  • Wood block
  • 15/16-inch wrench
  • Replacement blades

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  1. 1

    Park the LX420 on level ground. Apply the parking brake and remove the key. Remove the cutting deck from the tractor. The deck is the housing where the cutting blades are located. Place the blade engine knob in the off position.

  2. 2

    Move the deck lift lever so it is in the bottom notch. This will lower the deck and cutting blades toward the ground. The lever is on the right side of the fender.

  3. 3

    Remove the blade drive belt from the tractor engine pulley. The belt is above the deck housing, under the body of the tractor.

  4. 4

    Locate the deck support pins on the left and right side of the deck. Pull each pin and rotate it toward the back of the tractor. This pin will not come out all the way. Move it and place it in the hole that is provided. Once both pins have been moved, the deck will disengage from the body of the mower.

  5. 5

    Move the deck lift lever back to the starting position. The deck should now be on the ground. Wheel it out and carefully flip it over.

  6. 6

    Secure a wooden block between the wall of the deck and the mower blade. This will stop the blade from shifting or turning while the blade is being removed.

  7. 7

    Loosen the nut holding the blade using a 15/16-inch wrench. Remove the nut and take off the blade.

  8. 8

    Put the new blade on the spindle. Make sure the side of the blade with the part number faces the ground. Put the hex nut on top of the blade and tighten it with the wrench. Do this for the remaining blades in the deck.

Tips and warnings

  • When choosing a replacement blade for the LX420, try to find the Toro 42-inch LX420 Star Mower Blade, model number 112-0315. These blades are specifically manufactured for the LX420 riding mower.
  • Consult your operator's manual to locate specific levers and parts of the Toro LX420.
  • Use caution when sliding the deck out from under the mower and flipping it over. The blades are sharp and should be handled with care.

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