Question about Bosch BOS18946 9" Large Angle Grinder

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Hey there I do not know how this fix ya site works but I will give it a shot. I am stumped I am working on a nine inch grinder, and here is what it does. Hit the button and it will run for about six seconds then trip a 15 amp breaker. Here is what I checked, the brushes have plenty of life in them, I opened the case unplugged the switch from the motor and I checked it out and is working properly. Moving on to the motor, first I checked for any kind of binding and it is as free and spins well. I went deeper I pulled the entire rotator out of the case and took some emery cloth to it and made the copper armature shine, and cleaned out all the groves, then put it all back together again. I put the brushes back into the case and have 0.9 ohms between the brushes, everything looks well am I just not seeing something that I should....??? Oh yea while I had the brushes out I did check the resistance between the opposing coils on the stater and there is not a short. If for some reason you can think of something that I did not check please let me know. Thanks Tom.

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Hello, W/D here.

You've checked quite a bit! When you polished the armature contacts, did you polish along the length of the contacts? If not, re-polish in the long direction, and then clean the contact area with electrical cleaner. This may help.


Posted on Apr 01, 2011


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