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Makita sp6000 plunge saw


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Is there any visible arcing? I find it's usually bad brushes that cause a loss of power at first glance. Brushes are cheap, start there.


If that doesn't fix it, you'll have to take it apart presuming it's out of warranty - if it's still covered just send it back to Makita.


If the armature is burned out you'll get smoke, barely enough power to cut anything if not a complete failure to turn after trying for a while. A multimeter will show open circuit across all windings. Check online for common values of resistance, if any are well out of range +- 2-3 counts you have a bad winding. 


Check the commutator surface. Does it show signs of burning, is it pitted? Is it out of balance or no longer perfectly aligned face to face?



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