Question about Black & Decker 4 1/2" Small Angle Grinder

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High vibrations & pinion looseningin 4" angle grinder

Can you pls list ourt various key points to be investigated if a 4", that is, a 100mm angle grinder has high vibrations while working.
Secondly the pinion gets loosened. I used a lock nut above the pinion so that it arrests the movement of pinion upwards. But the nut again gets loosened.
Kindly help me out by stating what might be the suspect.

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Could be couple things the wheel is out of balance or out of round causing the vibration, the armature shaft could be bent causing this also the bearings could be bad. One last thing to look at is the fan on the armature to make sure not cracked or missing fins. Let me know the model and brand and I will look further

Posted on Jul 20, 2009


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