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Exesive sparks on the brushes (Bosch GSB 16RE drill)

I overpowered my drill and now there are exesive sparks on the brushes.First I suspected the armature and changed it , still no joy, then I measured the fieldcoils and found it totally differend ohms and replaced it but still no good. Could it be that my armature got hurt by the broken field coils?Please HELP

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  • lorna_vanzyl Jun 17, 2009

    I have just ran it with no load and it was still sparking, but took it to repair shop -they tested the armature while I was there -no fault- I am still waiting for there answer thanks for reply

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If you used the drill any amount with a burned field coil there is a good chance that is has burned the new armature out.

Posted on Jun 11, 2009

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Posted on Jan 02, 2017

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Is there a Deep discharge protection connector on your powertool ????

The thirth small contact in the battery connector or only 2 contacts ?

If not then its an advise it must be modificated then you have only to break off a notch on the new modificated battery holder connector so it can be placed in the older not marketing technical modificated housing, and you have to change the switch and the battery connector , the differences are 091A. 643844-1 old batteryconnector (2 contacts) change into 091B. 644808-8
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What you need is even expensive by this model if you have a modified type with the 3 contacts to know what can be wrong else is remove the brushes charge you battery and measure it first if its full and take a multimeter measure tool between both brushholder measure and pull the trigger that must between give 16and 20 volt DC if the battery was good charged . next measure is ohms resist measure both brushes in the brushholders and measure for a few ohms from brushcontact to brushcontact throught the armature inside the machine.
if not a resistance to get measure through the armature without brushes if some object or parts was comming trough the ventilation of the machine between armature and brusholder then the brush beet not the collector anymore different things to look at .
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