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Locomotive DC - run not smooth

1789 Views 5 Replies 3 Participants Last post by  silverfank
Hello guys, i'm beginner in model train.
I bought a second hand loco. test running, but not smooth as expect. Sometime i have to push it to run.
What is the possible cause of this?

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Thank you guys, having sent it back to a seller, It was fixed by cleaning both polarity connected to the motor.

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Hello guys, i found its root cause.
Recently the issue occur again. It's both hand contacted with motor is not stable as you can see in the video. I adjust it to touch a motor a bit looser. Let's see how far it can run smoothly.


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