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problema masina de gaurit

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Am o masina de gaurit care desi merge in gol nu ajunge la turatie maxima si se incinge statorul si periile colectoare care fac ceva scantei, mai multe ca deobicei.nu imi dau seama care ar fi problema...

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am curatat colectorul de era ca nou:nici un efect.perii noi:nici un efect.e posibil sa fie rotorul in scurt: rezistenta dintre oricare 2 contacte de pe rotor este intre 1 si 5 ohmi.si totusi daca e rotorul in scurt e logic sa mai functioneze??? pt ca totusi se invarte dar se si incinge.

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