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I have a dewalt dw364 circular saw. the motor is running slower and sparking internally. The motor also starts smoking while using. A suggestion was to replace the brushes.

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I agree with replacing the brushes, and don't use it until you do, so no damage is done to the motor. If it is smoking there is some overheating. Best regards and good luck.

Posted on Dec 31, 2010


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Careful study of the exploded parts diagram may help you find the secret to opening the cover. Usually (I've "been there" with other motors) it is some item blocking, such as the brush holders, a C ring, the fan... something is blocking disassembly. I hope this helps get you on the trail. If you don't have the diagram, a copy is at:

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I have just brought a new dewalt dc390 cordless circular saw and it seems that the motor is running backwards?

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You can contact DEWALT here:
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Dw364 looks like an arc welder where the brushes are , blows breakers and electric brake doesn't work DEWALT WILL NOT ASSIST

could be a couple problems, first unplug tool and remove brushes, I would assume they are burnt or short, next while turning blade by hand look at the commutator to see if there are raised bars or extreme discoloring, if so the armature needs replaced. I would start with these 2, after installing new brushes you probably have to clean the commutator. Let me know if you need more assistance.

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1 Answer

The motor is running slower and the engine begins to smoke as if it is burning up. A suggestion was to replace the brushes.

It sounds like some oil has gotten onto the armature of the motor where the brushes are. That will cause the symptoms of what is happening.
Get some Electric Motor and Brake Parts Cleaner at an auto supply house. Note: It is not flammable.
If you cannot find it. Get the Regular Brake parts cleaner.
1 Allow the saw to cool to room temperature.


3 Spray the cleaner it into the vent holes
4 Carefully remove the brush caps (Small Black things that look like buttons) There are two of them.
5 Spray inside where the brushes are.
6 Let it dry out for a day.
7 Re-assemble
8 Plug it in and see how it works.

If it is still running roughly after you do the above steps. Get it serviced. There is damage to the armature and brushes.

Hope this helps.
Best, Mark

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DW705 Miter saw Spark in motor Compartment

Yes spark in motor compartment is normal. You only need to worry if you see a lot of sparks flying out of the motor compartment! Most power tools will spark inside the motor compartment (particularly if carbon brushes are used).

Bevel and miter could be off... Consult your manual for how to adjust these correctly, but usually the bevel has a 0-degree setting screw or adjustment, and the miter adjustment on the saw is usually done by altering the fence position... Again check your manual for specifics on your saw.

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First of all, congratulations on your new place! I think this box is pretty useful for beginners:

Let me know if you need further help, and good luck!


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