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On and off speed

I have a SP3200 that the speed variates between drive and limp mode. I had notice the brushes were very worn, and the armature was black. so I R&R brushes and cleaned the armature. thought that would fix my issue but it didn't. Anyone else have this issue and know what steps to take to fixing? or anyone have an idea on this.
Please every opinion is accounted for.
thank you
  • Posted 10 Jun 2019 16:03
  • By Mechanic_1217
  • joined 31 May'19 - 9 messages
  • New York, United States
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Showing items 1 - 2 of 2 results.
I don't know why it was edited. Starts to drive, then cuts out. Starts to drive, then cuts out....over and over? Control card needs replaced
  • Posted 13 Jun 2019 22:56
  • By Ifixit
  • joined 30 Jan'17 - 174 messages
  • Pennsylvania, United States
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When you start to drive(either direction), does it start to go..then shut of. Start to go, then shut off...over and over? That would indicate the control card needing replaced
  • Posted 13 Jun 2019 22:41
  • By Ifixit
  • joined 30 Jan'17 - 174 messages
  • Pennsylvania, United States
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