Question about Dewalt Chop Saw D28700

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Metal chop saw blows breaker

My dewalt 14'' chop saw is blowing the breaker switch. Armature coil, brushes, and bearings are good. It sounds that the gears are dragging. what can i do?

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Is there anything else running while you are cutting? If not is the breaker 15 amp or 20 amp. If its 15 amp, I would change it to a 20 amp breaker. Make sure the wires are thick enough to handle the extra load. If this isn't the problem check the cord from the saw to the outlet.

Good luck!!

Posted on Aug 23, 2009

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a bad centrifugal starter or inside capacitor and or the electric field if an old type with induction motor , but if it has carbon brushes in the motor instead of an induction motor the commutator on the armature short brushes or a bad bearing(s) on the motor or other gearbearings on the saw drive are worn , it must have a smooth turn if turn on the armature if remove the field /motor house.. look in the motor if running at the end if the carbon brushes you see are make to much sparks a worn bearing without the balls or bad armature collectors or electric field . watch if the bearing is worn by blue hot it can have melting the seat in the motor house replace it all.

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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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6180-20 chop saw trips 20 amp on start up all the time Terry


If it trips the breaker as soon as you hit the switch, check the power circuit. Check the power cord for frays or cuts, especially where the cord goes into the saw. Remove/split the handle and check the wires into and out of the switch and to the brushes and field. Lood for burned or melted wires or case parts. Milwaukee is notorious for running lots of small wires in very tight places. Make sure none of them got pinched when the tool was assembled. Watch for this also when you reassemble the saw. Check the brushes, if they're worn or broke they can cause a short on the armature. If these all check out you need to have the armature checked on a growler for shorts.
If the saw runs for a few seconds then trips the breaker I'd check for gear and bearing problems. Cehck for free, smooth movement of the bearings on the armature and blade drive assembly. The blade should turn freely by hand. Feel for undue resistance or a gritty feel in the bearings and gears. If necessary replace any offending parts.

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Sir i m azim from fiji dewalt dw 871 xe model chop saw sparks too much at brush.also sounds different.so what the problem .sir technicians say the coil.we tested its ok.we changed armarture but still the...


Hi and welcome to FixYa. I am Kelly

With power off grab both sides of the blade and try to rocking (NOT SPINNING) the blade in opposide directions on each side of the balde. Then while rocking the blade, see if the armature teeters inside the motor.

It it does have excessive movement then the rear motor bearing is probably worn excessively.

I have to ask if this is a 110V cut off saw and your trying to use it on 220V because it will produce the exact symtoms you described.

I also note that you did not mention if you had changed the brushes. Worn brushes or weak brush springs can also cause the symptom you describe.

Hopefully this gives you something to work with.

Thanks for using FixYa!

Kelly

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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,...


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

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My Dewalt chopsaw is loosing power and sparks heavy in brushes


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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