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Old 04-28-2014, 09:17 PM   #1
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i have a question i am new to this site but was wondering if anyone knows why my Dewalt DW708 type4 miter saw would run at half power or maybe the brake might b locked but i replaced the brushes but it is still running at half power and if i keep running it it will throw the braker can anyone help me with some info

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Old 04-28-2014, 10:47 PM   #2
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Hard to tell without doing some testing but my 1st guess would be that you have a broken wire in one or several of the windings of the motor.

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Old 04-28-2014, 10:56 PM   #3
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How burned were the commutator contacts? Are the brushes riding flush on the commutator?

Bad wire or connection de-soldered, Need to have a motor technician look at it, before you burn it up completely.

And WELCOME to the family,

ED
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Old 04-28-2014, 11:01 PM   #4
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YES !
I will bet on a faulty winding
Could even be still dirty commutator segments
Maybe even dirt in between two segments
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Old 04-28-2014, 11:02 PM   #5
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From the brushes, there is electrical continuity to the windings of the motor. A wire to one of the brushes could've become detached. When you say it throws the braker, do you mean the house breaker switch or the motors' thermal cutoff switch ? (Just asking to be positive so others)

Another thought. By hand, can the blade be easily turned?
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Old 04-29-2014, 12:40 AM   #6
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It throws the house breaker and the commuter is that the copper that the brushes ride on at the end of the armature I will have to try and see if I can turn the blade by hand easily though
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Old 04-29-2014, 12:41 AM   #7
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Also how would I clean the segments besides with just compressed air
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Old 04-29-2014, 10:53 AM   #8
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Clean the commutator with Q-tips and alcohol. let dry thoroughly. if you do not dry it will flame.

Commutator: the copper part at the end of armature where the brushes ride.
And if it is pitted you need it rebuilt.

ED

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