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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First to do is inspect the motorhous before invest in parts because the armature must run exactly in the middle beteen the coils in the middle of the electric field but if there is a bad /worn bearing that was full of dust then the armature is run slowly by time getting hotter and hotter because of the dirt thats slowly running in the bearings in the years of use, remove the belt and feel first you can turn the armature without to much resistance feel the pulley on the chisel holder to control also all the other bearings they can be cleaned or replaced , look allways that every bearing is still quite by removing the seal with a sharp knife to look if its bushing is not worn then solvent clean it make dry and re-greasing it may also be good for lubricating to squirt If the rpm of the armature is not high and gives sparks, clean the commutator or clean collector has in 80% of this kind tools barely no use replace both the electric field as well as the armature and if the motor housing on the bearing seat has no melting damage otherwise it could be inbetween possible, that the investment become to be large compared to perhaps the age of the device and delivery of parts. but clean out all the dirt before repair for better longlasting your tool.

Posted on Dec 31, 2016

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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

  • Corky's Craft Shop
    Corky's Craft Shop Dec 31, 2016

    Answer spot on. I too have been in the business for more years than I like to count, and, as you said, although it's not what the customer wants to hear, it's usually the armature that's the problem. You can be sure of this by just inspecting the commutator of the armature, for burnt spots. It only takes one to make the trail of sparks around the armature when running. More often then not it's more economical to pitch the old and buy a new unit.

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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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#2 Visual of the armature - is it black / burnt or does it have raised segments?
Most likely it will need an armature if it has run for any length of time with bad brushes.
The armature comes out the front of the motor housing so you need to remove the gearcase to access it. Armature 2610003331 for Bosch Power Tool eReplacement Parts Carbon Brush Set
23910152-1tmh4chmwaodqgbdv43dd3kn-3-0.gif

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Please note......The Kirby has TWO safety switches that need to be engaged before it will operate. One is on the fan case in the front. It is activated by having an attachment attached to the front. (hose, power nozzle, etc.) The other switch is on the side of the Kirby where the cloth bag attaches and is engaged by the little tab that sticks out from the side of the hard plastic cloth bag "boot". The bag boot MUST be completely engaged to activate the safety switch and allow the Kirby to power on. If you are having trouble getting the bag to properly engage, (sometimes they are STUBBORN) simply lubricate the black gasket that the boot fits onto with gasket lubricator, VASELINE, or try a tiny drop of DISHWASHING DETERGENT or HAND CREAM. It doesn't take much, so use the smallest amount possible to get the desired effect. You should hear a slight "pop" when the bag completely engages.
If neither of these things are indicated, it is probably again, either the power cord, switch or the carbon brushes.

If your Kirby is sparking there are a few causes...

PROBABLE CAUSE (MOTOR): Worn out carbon brushes, bad armature or perhaps BOTH
PROBABLE CAUSE (CORD): The cord has a short in it. Replace the power cord
PROBABLE CAUSE (POWER NOZZLE): There is something metallic stuck in the fan or power nozzle

I think you have a problem with the carbon brushes and amature because of where you describe seeing the sparks. I would suggest taking it to an authorized dealer for repair if it is the motor that is going bad.

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