How to Replace a Craftsman Edger Blade

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A gas-powered Craftsman edger is an excellent way to sharpen up the edges of a lawn. However, through repeated use, the hardened steel blade will eventually wear out from contact with concrete, rocks, and abrasive particles in the soil. Luckily, these are designed to be replaceable and are available in many lawn and garden stores.

Things You'll Need

  • Open end SAE wrenches
  • Torque wrench (if available)
  • Clean rags
  • Rubber mallet

Disable the ignition system by gently pulling the spark plug cap from the spark plug. Be sure the throttle is set to "off" and that the machine is parked on a flat surface. An accidental start or having the edger fall over on you can cause serious personal injury.

Use two appropriately-sized wrenches to remove the nut holding the old cutting blade on. The shaft behind the blade is cut into a hexagonal pattern which allows a wrench to prevent the shaft from turning while the nut is being removed. When attempting to turn the nut, make sure that the wrenches are being pulled in a safe direction so that an accidental slip will not cause a blade-related injury. Turn the nut counter clockwise to remove it.

Remove the old blade by tapping it with a mallet and sliding it off the shaft. Compare the old blade to the new blade. Aside from blade-tip wear, they should appear similar in thickness and should have the same number of spokes.

Place the new blade on the shaft. Use both wrenches again to tighten the blade-locking nut. The nut should then be torqued to 43 foot-pounds using a torque wrench. If this specification is not met, the blade will slip and gouge the shaft over time. If the blade is torqued too tightly, the threads on the shaft may strip.

Rotate the blade manually with your fingers to make sure it will not hit anything such as the blade guard. A blade hitting the guard is an indicator of an improper or bent blade. Reconnect the spark plug to finish the job.

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