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I havebeen using a makita 9527 pb 4.5" angle grinder and all the sudden the grinder had troubles working all the time at first it took a little shaking to start up then hitting against a hard surface then would not start at all? Any ideas what could be the problem ?

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There are various causes of failure but the checks should be carried out in this order, you will need a continuity meter or multimeter to trace continuity from the plug to the switch in the grinder:

If plug is rewireable check for loose screws at plug pin terminals, loose fuses etc.
Wires in power flex breaking, usually at plug or where flex enters machine.Check the continuity from each pin of the plug to the switch in the grinder
Faulty on / off switch or loose spade terminals on switches.
Worn out brushes.
Armature or field coils of motor going open circuit.

Posted on Mar 28, 2011

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