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Dewalt Dw618 motor is noising and lost power

5K views 10 replies 7 participants last post by  Slemi 
#1 · (Edited by Moderator)
This weekend my Dw 618 started to make a different noise (sounding really nasty) and lost your power. I immediately turned off and open the cap to see if was anything broken or burned. It's seems everything is ok. I'd spin the center post (communicator?) It spun freely it didn't feel like it was grinding on anything.

Are these brush motor heads bad? This may be the problem?

Electric blue Wood Tool Hand tool Auto part


Please, check this video also. Is seems to have abnormal spankings around the spindle.





 

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#2 · (Edited by Moderator)
First off… ARE YOU NUTS? Running that motor without one side of the armature being supported is a disaster waiting to happen. That upper bearing isn't being held in place so the armature is just flopping around. And you are surprised that you are getting sparks? Hopefully, you didn't trash it too bad.

Clean things up and replace the bearings. The brushes look fine.

Cheers,
Brad
 
#5 · (Edited by Moderator)
Você parece ter um desejo de morte . Não brinque com esse motor assim. Ele pode feri-lo gravemente .

It's hard to say exactly what's wrong. If the brushes aren't seated correctly, they can spark. By running it with the top off, they can spark. But, I notice some exposed bare copper on brush wire. It could be causing a short with the brush housing, in particular the spring. Usually, brush leads are not insulated, but yours is. Put some electrical tape over it.

Before putting it back together, look at the commutator contacts and check its condition. If it is dirty clean it by wiping it with some alcohol. Make sure you don't use the alcohol on any other part of the commutator as it will dissolve the non-conductive coating.
 
#7 ·
Thanks for advice guys. I will not turn it again without cover cap.

I realize now that speed control isn't working also. Make sense, why the motor don't rotate to your full rpm due the commutator problem, speed control can't change speed.

I will sent him to a Dewalt service tomorrow, it's more complicated to me than simple change a pair of brushes.
 
#10 ·
100% the rotor is dead. There is short between two of the poles. If You take it out, You will see it is eroded at the point of failure. That s why the brushes are so eroded.

- Slemi
Slemi, thanks for prompt answer, this make all sense. Do you think that a way to fix it, or i will need to buy a new complete rotor?

I ask why, I bought this router in USA and now I live outside USA and here we don't have replacement parts for this product because Dewalt don't sell it here.
 
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