Question about Makita 1806B 6 - 3/4'' Planer

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Carbon brush sparking and cause no power for electric motor

When the switch turn on there is spark coming from the carbon brush of the motor and sometimes it produces smoke and also the electric motor has no enough power.

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You have either one of 2 problems. Either you have a brush that is hung up and burnt or the armature is bad. If you are comfortable in removing the brushes first unplug the tool and remove the brush caps. Pull brushes out and look at the spring making sure not collapsed and then the end of brush that rides on armature for a burning look. Then I would look into brush tube and try and turn by hand the roller to look at the segments of armature best you can. If this needs anything other than brushes I would take it to a repair shop. Good luck
Dave

Posted on Dec 28, 2008

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David's answer is spot on, although I'd bet a fair sized chunk of cash that the problem will turn out to be the armature instead of brushes. After 45 years of being in this repair business I could count on one hand the number of times that I've been able to replace the brushes, dress the armature and call it good. These things almost always turn out to be the armature, at a minimum, usually I recommend using new brushes to run in the new armature. This is a very important part of any repair that involves armature replacement, and that's the run in. The unit getting the new armature should be run at about half speed for 2 - 3 hours before cranking up to full power. This allows the new brushes to form full contact with the armature. Once that's done the unit should be good to go.

Posted on Nov 30, 2014

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I would first attempt to swap out the brushes. A thumbs up would be greatly appreciated if answer is helpful for your question. THANK you and GOD BLESS

Posted on Nov 22, 2014

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Couple things, I would first take the handle half apart (if there one) and look at the condition of the commutator. Second make sure the brushes are fully seated. What happened to the old set of brushes, why did you replace them. Are the brushes you bought made for this tool? Sometimes when replacing the brushed the commutator has to seat them. THis is tricky unless you know what you are doing. Check on the items I suggested and get back to me and lets see what else we can look at. One more thought on the armature commutator how do the bars look, are they all pretty much the same or do you see some that are raised above others, if so the armature is bad and needs replaced.

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