Question about Bosch 5" Small Angle Grinder

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Bosch angle grinder stopped cold when tapped lightly

Only a few hours on my bosch 1800 angle grinder. While using it I lightly tapped it on the ply top bench by mistake. It stopped cold and shows no signs of life. Opened it up and all looks normal, not much dust around switch and all. Could this be a brush backed out by the force of the bump? Bad switch? If it was the switch woud I expect symptoms before it stopped completely?

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  • rkobernuss Mar 10, 2009

    Thanks for your time. I don't have a volt oh=hms tester, but I do have a continuity tester that makes the user part of the circuit. Would that do? I'll look at the brush springs too.


  • rkobernuss Mar 11, 2009

    Before I saw the last post I opened it up and gently manipulated the brush parts and wire contacts near brushes. Reassembled and it works! I read where there is an internal device that cuts the tool out if the brushes are worn for motor protection. I'm guessing that one of the brushes backed out a little, triggering the safety cut out.

    Thanks for your time,


  • David Ford
    David Ford May 11, 2010

    It sounds like you loosened up a wire, If you have a volt ohms meter check the continuity thru the cord to the brush holders. Also check to make sure that the brush spring did not come off the brushes. Let me know


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Yes, if you have taken the handle halves apart (unplug tool first) check with your meter thru the blades on the cord to the switch contacts and then lock the switch in the on position and check across the switch and then remove the brush caps and brushes and check thru to the brush holders, if at any time you lose continuity then that would be your problem. Let me know if I can help further.

Posted on Mar 11, 2009

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I suggest you set up a new folder on your PC titled "household items" and save a copy titled "Manuals" etc. so you will always have a copy for future use and reference.

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