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  1. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    My Makita 18v battery grinder is running half speed ( approximately . I havent measured the rpm ) is this likely to be brushes or something more terminal . Went to check the brushes by removing and inner and outer cap but couldn't do it . Any advice would be appreciated
  2. Sean Kelly

    Sean Kelly Trusted Advisor Professional Tiler

    The outer cap is probably covered in adhesive!! Just use a screwdriver and they will pop off.

    The inner ones are threaded. If I remember correctly they have a slot in the middle of them so that you can get a flat head screwdriver and turn them. Failing that use a thin nosed set of pliers to give them a good turn.

    Take out the brushes, again by prising them out with a screwdriver.

    The slowness of your grinder is probably the worn brushes!
    • Agree Agree x 1
  3. antonio

    antonio Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    they may not be the brushes,
    lately the brushes have a copper wire inside,
    when the copper touches the winder, the block is immediate.
    the grinder no longer works
  4. impish

    impish Trusted Advisor Professional Tiler

    Aren't they brushless?
  5. jcrtiling

    jcrtiling Professional Tiler TTA Member Top Contributor

    Not if you're a cheapskate like me and buy the cheaper version
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