A lawn appears professionally groomed when the edges are well kept along driveways, sidewalks and curbs to remove grass that grows along hard surfaces. Troy-Bilt manufactures two different types of edgers. One is a standard edger with three wheels, and the other has an additional curb wheel to guide you along curbs as you edge. Each model uses a differently shaped blade to perform its task and the replacement method is slightly different for the two.
Turn the edger off and allow it to cool completely if it was recently in use. Remove the black spark plug boot from the spark plug on the front of the engine.
Put on safety glasses and leather gloves and walk to the left side of the edger from the operator's position. Place an adjustable wrench on the hex bolt head, or axle, behind the blade and hold it in place to keep it from rotating. Place a second adjustable wrench on the outer flange nut on top of the blade and turn it counterclockwise to remove it.
Pull the tri-star blade off the axle and place a new one on the axle. Hold the axle in place with one adjustable wrench and tighten the flange nut clockwise with a second adjustable wrench.
Press the spark plug boot back onto the spark plug on the engine's front.
Allow the edger to cool if it was recently in use and remove the black, rubber spark plug boot from the spark plug on the front of the engine.
Put on leather gloves and safety glasses. Walk to the right side of the edger from the operator's position. Insert a 5/16-inch Allen wrench into the spindle's hole in the center of the nut on top of the blade. Hold the Allen wrench in position, place an adjustable wrench on the nut and turn it counterclockwise to loosen and remove it.
Slide the double-edged blade off the spindle and insert the hole in the center of a new blade onto the spindle. Put the nut on the spindle on top of the blade and tighten it clockwise by hand. Insert the Allen wrench into the hole, hold it in place and turn the nut clockwise with an adjustable wrench to tighten it.
Press the spark plug boot firmly onto the spark plug.