SOURCE: 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
SOURCE: My Dewalt chopsaw is about
If you can get your hands on a continuity tester, do a continuity check from the plug through the flex ,the switch, armature and back to the plug .It should be possible by a process of elimination to discover where the break is in the circuit.
It might be simply that there is a break in the cable where it exits the mains plug or where it enters the chop saw
SOURCE: delta metal chopsaw one
I can only think the connection is weak or intermittent, which would cause the arcing. Try to switch the brushes and see if the problem follows the brush. If it does, then pull on the spring to extend it a little more and widen the prongs which touch the brush holder. If the problem does not follow to the other brush holder, then it could be a damaged brush holder which is cracked or the spade connector is damaged.
Testimonial: "thanks for the info i never thought of changing the brushes i will try that. thanks again"
SOURCE: Dewalt dw130v brush replacement
You have to remove the black cap on the back of the tool (item 4) and I believe you may also have to remove the back part of the switch handle (item 3). Here is a parts diagram so you can see where the brushes are located.
DeWalt DW130V diagram
SOURCE: how do i replace brushes on dewalt table saw
unscrew brush cap on each side of motor and pull brush out
do it reverse with new one
216 views
Usually answered in minutes!
×