Take a large adjustable wrench and grip the bump head (black plastic) at the same time use your other hand to hold the line spool (orange plastic) rotate the the wrench in a counter clockwise direction slowly and carefully to ensure you are not applying force in any other plane than parallel to the spool or you may damage the bump head threads just until it breaks free. Remove the rest of the way by hand. This happens to me from time to time. If you care you can put a small amount of graphite on the bumphead threads to allow it to come off with hand pressure.
Hello! Trimmer Line Installation; Place Trimmer On Workbench Or Floor, Grasp Trimmer Housing With Left Hand Turn Middle Nut With Right Hand,Left To Right Removing Center Peace,In Some Models Suchas Electric Models The Center Piece Just Snaps In.Remove Nut Remove Line&Spool,Bottom Caseing.If Spool&Inner Housing Is Dirty Cleam With Soap&Water.Pay Attention How Line Is Inserted Through Spool,You Will Need To Reinstall Same Way.You Will Need About Twenty Feet Of # 60 Or 65 Line.Buy Line At Any Home Improvement Center. Most Trimmers Are Double Lined.Find Middle Of Line,Thread Through Holes That Old Line Came Out Of.Wind Line Accordingly To Arrows On Spool Edge. Leave Enough Line TO Insert In Groves On Edge Of Spool.Reinstall Spool Put New Line Through Holes In Outer Housing Pull Line Untail Line Is Free.reinstall The Rest Of Parts In Reverse.Hope This Helps,don't forget to give 4 thumbs up,any comments welcome,thank you, ``
SOURCE: Replacing the cutting head on Ryobi string trimmer.
There is a nut above the head, place a wrench on the nut then unscrew the head from the shaft, unless yours is different from mine this is how it works. I hope this helps.
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