How to Change the Brush Blade On a Troy-Bilt 4-Cycle Trimmer & Brush Cutter

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The brush cutting blade on your Troy-Bilt trimmer is useful for cutting down larger areas of over-growth around your property. The density and thickness of over growth sometimes wears out the cutting edge on the brush cutter blade. Changing the brush blade on a Troy-Bilt 4-cycle trimmer and brush cutter requires locking the shaft of the trimmer. The unit comes with a locking tool that resembles a bent piece of rod. If you do not have the original tool, a simple nail does the same job. There are two holes, one on the inner shaft and one visible around the outer shaft, that you lock together preventing the shaft from turning while changing blades.

Things You'll Need

  • Locking tool
  • Finishing nail
  • Socket wrench

Unplug the spark plug wire from the spark plug on your Troy-Bilt trimmer. Grab the spark plug wire where it covers the spark plug with your fingers and pull it straight off the plug. Place the trimmer on its side with the fuel tank filler neck pointing up.

Insert the end of the locking tool in the hole on the head between the blade and the gear housing. If you do not have the original locking tool, insert a finishing nail into the hole. Rotate the blade by hand until the inner gear housing hole lines up with the outer hole. The tool or nail will slip into the inner housing hole.

Hold the nail or locking tool inside the hole and turn the securing nut in the center of the blade clockwise with a socket wrench. Remove the nut and the blade retaining washer. Pull the old blade off the trimmer shaft.

Place the new blade over the trimmer shaft. Place the retaining washer over the shaft and thread the retaining nut onto the shaft. Hold the locking rod or nail in both housing holes and turn the nut counterclockwise to secure the blade.

Remove the nail or locking rod from the hole and press the end of the spark plug wire over the spark plug.

Tips & Warnings

  • Wear gloves when changing cutter blades to avoid accidental cuts.

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