Question about Ryobi Saws

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My Ryobi 10 inch miter saw, model TS 1340 has been working fine for years, now in the last 7 days, I see heavy sparking at the carbon brushes and a drop in power from the saw, there is a strong smell of ionized air and carbon. I replaced the carbon brushes and still I have the same problem, what is wrong and what shall i do? .... I am no expert but I am 'average' with making repairs, I am up for this task! I have photo and video of the arcing at the brushes if needed by any one. 3-08-09

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  • david Trompower Mar 09, 2009

    Thanks these are good suggestions. I looked and the copper plates are black in color. The old brushes have discoloration due to the arcing, I am assuming.
    I had to order the new brushes from out of state, as there is no local repair store near me by any means.
    You suggest the possibility of Using a stone to clean the commutator? a great idea, i don't have a special dedicated one but, have a very fine, round, polishing stone I could use
    I will send a picture soon, I also have a movie of the arcing I could send you, however it will not fit here, due to the size limitations of images, FixYa has in place. Are there any other means that i could send you the movie?
    3-09-09


  • david Trompower Mar 10, 2009

    Rowdy45176
    below is a picture of the brushes arcing.


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  • 2,176 Answers

It sounds like the armature has developed an open commutator bar. What did the brushes look like that you took out. But before I assume the worst I would unplug the tool and remove both brushes and with a flas light look into the brush tube while slowly rotating the armature looking for a discoloration or raised bar. If not you might bet by with cleaning the commutator with a special stone for this, you might be able to get one at the repair shop where you bought the brushes. If you want to send me the photo of the arcing it might help on my end. Let me know

Posted on Mar 09, 2009

  • David Ford
    David Ford Mar 10, 2009

    Dont need the movie, anything that you can do to clean that commutator would probably help, you could have had a brush stick and arc which discolors the commutator not allowing the new ones to seat properly and that is the fire and arc that you see. It is worth a try first. can you remove the back cover to get access to the commutator with your polishing stone? I in the past have used a WOODEN emory board. DO not put any metal around that area or you will get shocked. Let me know

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