Question about Makita 9553NB 4" Angle Grinder

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My grinder is making a arching sound and i can smell burning is this the brushes?

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Yes, that is usually the brushes, they need to be replaced...


Posted on Sep 14, 2010

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probably not, I would check the brushes and while the brushes are out look at the commutator thru the brush tubes, when it overheated did you smell something burning? if so you might have a electrical problem or did you hear something squealing then it might be bearings or gears. It depends on the situation but this tool doesn't have a thermal overload that will reset.

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If the only part that's causing the burning smell is the brushes, yes it's worth fixing.
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Sounds like your brushes are used up. Take the brush caps off on each side of the grinder handle, if the carbon is 1/8" long or shorter they have to be replaced. (Makita Part #191938-1) If you overworked the tool (put too much pressure on while grinding) it's possible the armature and/or field overheated and burned out. They are Makita Part #517301-4 and #521621-0 respectively. You need a growler to check these items to see if they're shorted out.

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I have this grinder, when i plug it in and turn it on it starts smoking and has an electrical burning smell. Is this the brushes going out? and it doesnt seem like it is going full speed. Is there a fix...

Brushes usually won't start smoking on power up. Sounds like shorted windings. I would recommend a new unit rather than risking a fire. I would also recommend a professional brand if it is something you will be using a lot. In the long run it will save you money.

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Just replaced the brushes in a Metabo WE14-150Quick Angle grinder

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