Question about Makita Saws
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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Posted on Jan 02, 2017
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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