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Reply to "N/S F-7 270 (20-21357-1) Herky-Jerky running, and lost pulling power. Ugh."

Well if it doesn't go back I had some thoughts. A MTH that loses it's tach signal can go goofy. That depends on a couple of things though. I agree with Ted. Your issue almost sounds like a truck misbehaving for some reason. That could be anything from a broken wire, tight (wires?) so it can't swivel, etc.

First and always, look closely at the traction tires if equipped. There were a release of G scale tires that liquified when run. Then swivel the trucks and check for free full motion in all directions. Of course, make sure all wheels turn! Edit: (under power)

If you go inside spin the flywheels fully and check for binding like previously suggested.

I hate seeing engines returned for the easy stuff. I buy some second hand and find that something easy went wrong.

Last edited by Engineer-Joe
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