Turn the trimmer head clockwise to unscrew it. If a nut holds it onto the drive shaft, turn the nut clockwise with a socket wrench. Note that this is the opposite direction that you usually turn something to unscrew it. The trimmer shaft has reverse threads to prevent the cutter from loosening while the shaft is turning. Remove the deflector.
It may be screwed to the end of the shaft with Phillips screws or tightened to the shaft with a collar. Remove the screws or loosen the collar to detach the deflector. Replace the deflector with the one supplied by the manufacturer for use with metal cutting blades. It should attach to the shaft in the same way as the one you removed. Place the blade on the thrust plate of the drive shaft, fit the thrust washer over it and put the rider plate over that. The rider plate is shaped like the trimmer head and has a flat top that rides along the surface of the ground when you're using the cutter.
Place the nut on the shaft bolt and tighten it counterclockwise with a socket wrench. The r is also capable of handling brush and saplings by removing the line trimmer head and installing the optional metal brush blade. Converting the r to handle larger vegetation and small trees requires that the blade be securely installed on the output shaft by following a few basic steps.
Place the Ryobi r on a level surface and remove the spark plug wire from the spark plug. Put on gloves for safety. Remove the string trimmer head by lining up the shaft bushing hole with the locking rod slot.
Insert the locking rod into the locking rod slot to keep the head from turning. Grasp the line cutting head with one hand and the locking rod with the other. Turn the line head clockwise to loosen and remove from the output shaft. Set the head aside in a safe place so it can be reinstalled when the trimmer line is needed. Place the brush blade on the output shaft by lining up the hole in the center of the blade with the threaded output shaft.
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