Question about Dewalt DW824 5" Electric Angle Grinder

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Why does my dw831 grinder keep tripping circuit breakers?

When you plug in the dw831 grinder, and then pull the trigger, the grinder runs for maybe five seconds, makes a terrible noise in the process, almost like a three phase motor that is single phasing, then the circuit breaker will trip. what is up?

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Try checking the brushes.

to do this: remove the 2 small covers on the left and right side of the tool and push aside the coil spring holding in the brush. the brush should freely pull out of the holder.

when you have the covers off, look for charring or melting. and after the brushes are out, rotate the arbor to move the armature inside and look to make sure it's not charred.

if that doesnt help, take apart the handle and look for melted or exposed wire. dewalt likes to pack the wires in tight among the screws and sometimes the normal vibration of the tool will cause a screw to cut into a wire and short the wire.

new brushes and holders (if melted) are usually around 20 dollars US

Posted on Nov 18, 2008

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