Question about Metabo WE14-150 Quick Angle Grinder

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

One side of the brushes has already worn down in just a matter of a few days, the other side still is good, what could be causing just the one side too wear down so fast, can you help me?

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When you replaced the brushes did you notice the tool throwing sparks? Generally when I work on these after replacing the brushes I have to clean the commutator to seat the new set. You could also have other problems, e.g. bad brush holder (did you replace as assembly or just brush) Let me know what happened to the first set and if when you plug in and try it does it come up to full speed.

Posted on Sep 12, 2009

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The Ohio Carbon part number for the brushes for this grinder is #20-870 and they are $3.53 each. There is a minimum order amount. Though it sounds like this is more of a commutator/spring pressure problem there is a chance the brush grade was incorrect. Ohio Carbon Industries is a manufacturer and distributor of carbon brushes for nearly all electric motors. Call our sales dept. at 419-496-4456 or email them at

Posted on Mar 20, 2012

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If you mean that one brush is wearing faster than the other, chances are good that one of your brush springs has become weak allowing one of the brushes to float a bit and to arch. Observe the brushes while running the tool to see if one archs more than the other. If necessary, replace BOTH brush holders (they come with springs).

If you mean that the brushes are wearing unevenly, chances are good that there is very excessive vibration and, or, a high concentration of dust (ie. concrete) passing through the tool. Excessive vibration is usually caused by incorrect, or damaged accessories. It could also be a bent spindle or worn out spindle bearing.

Posted on Sep 29, 2009

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