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Sparking carbon brush hr5001c - Makita Saws

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  • Makita Master
  • 885 Answers

Brushes can have very small, blue sparks coming off them and be OK. If it's bad enough that you can hear, smell or see excessive sparking it can be caused by: a) The brushes are worn down or the springs are collapsed and the brushes are not making good contact with the armature. b) The armature contact (commutator) is damaged or there is a short in the armature windings. Replace the brushes or armature as needed. I can't give part numbers as your problem is listed in cut-off saws and grinders but your model number is for a rotary hammer.

Posted on Apr 28, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 885 Answers

SOURCE: new carbon replaced produces too much sparks making it hot

Either your new brushes don't meet up with the armature properly or the commutator is damaged. Brushes usually 'wear in' within the first couple minutes of running. If it's getting excessivly hot you most likely have bad armature contacts and need to at least resurface the commutator or replace the armature.

Posted on Dec 30, 2011

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Rival slicer model #65301, sparks when I slice meat, need a new motor ?


possibly not as sparks can be from low brush length or the armature needs a clean up
all brushed motors spark when they run and normally it is a small blue spark the full length of the brush and contained under the brush
If it is a harsh arc like spark then the motor should be looked at by an appliance repair shop

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Check for a weak/collapsed spring on the sparking brush. Also check the brush holder for any interior debris which might impede proper brush movement. Do both brushes spark? There should be a fine line of spark at the brush contact to the commutator normally. Make sure the motor tuns easily, as a bad bearing can cause sparking due to overload conditions. Hope this helps!

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Where can I get brushes and at what cost?


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