Question about Dewalt Chop Saw D28700

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Dewalt chop saw blows breaker after a few minutes of use. Bearings bushes and armature ae good. Is the gear box dragging so much that it powers off and blows the circuit breaker? Where in San Antonio, Texas can I have it fixed or where can I locate parts to it? Thanks, Romeo Herrera romeoherrera@sbcglobal.net

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You can register with Dewalt ServiceNet(www.dewaltservicenet.com) and order parts direct on-line. In San Antonio Tx there is a local source located at 500 Culebra Ave San Antonio Tx 78201 ph#210-732-1221. The service net also provide exploded parts view of your machine which is very helpfull.You may have warranty an this machine in the event of any factory defect associated with this machine which can be determined on the service net....good luck

Posted on Jul 28, 2009

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I worked at a tool rental center while attending college and learned to repair tools such as yours. Damage to the armature occurs mostly during low power situations or overloading the motor. The damage is usually visable. Notice burned looking copper windings or commutator bars. You can test with growler or meter. We would turn the commutator on an armature lathe to true the surface of the bars. If the commutator is not perfectly round the brushes will bounce thus cause the sparking that you see. Also you must clean the groves between the bars with a blade to clean out all metal filings that can cause short between bars. (Broken hacksaw blade ground to fit the groves will work fine)Sanding with sandpaper may not be perfect enough to stop sparking assuming the armature is not shorted. Moisture will not effect the brushes, and sanding them square is ok but you can put the curve back by cutting fine sandpaper into strip and wraping it around commutator and insert brush into holder against sandpaper. Not necessary thou because all new brushes are square. New brushes however will increase the tension of the brush against the commutator preventing bounce due to new spring and longer carbon. Good luck enjoy

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