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Just got a 635  it has the 2 position  original e unit  Problem is it will not cycle in reverse goes from forward to hum ...I thought maybe wiring might be touching but can not see any problems the contact on teh e unit  look clean .. I cleaned the  winding on the commuter are all shiny clean new brushes  oiled  and not much run time any thoughts either to repair or what might be wrong thank-you Daniel

 

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@profoneill posted:

I have a 635 that does the same thing but I can't see where a plastic insulator would go on the motor cover. Can you explain in more detail what it is and where it goes? Thanks and Happy New Year!

https://ogrforum.com/...2#146142158647732272

This screw is not supposed to touch the tab under it. That insulated solder tab provides an important mechanical function... it provides a strain relief / anchor point for the field wire, and that's it. If it's shorted to ground, you will usually get operation in just one direction and a short in the other on a 2-position reverse diesel/loco.

Double Wound Anchor

Last edited by ADCX Rob

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