Question about Bosch Brute Breaker Hammer 11304

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Electrical spark unit stoped . Getting power through switch but motor will not start.

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  • Johnny
    Johnny May 11, 2010

    where did it spark? when it sparked, did it have a heavy burn odor?

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  • 141 Answers

More than likely you have a worn brush. If the breaker was running good and then just stopped this is the case. These brushes have a pop-off feature that will stop the motor when it is time to replace the brushes. If you replace the brushes and are getting a lot of sparking, the armature or field more than likely may have a short. Sometimes its the armature, sometimes it's the field, and sometimes its both (running short). You have to have a short tester and a growler in order to test for the shorts. One thing to look for is any burn marks on the windings of the armature, and look for scarring on the inside of the field which may have gotten damage due to rubbing from the armature. An imbalance in the electrical field can push the armature into the side of the field while it spins.

Posted on Oct 14, 2009

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Posted on Jan 02, 2017

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