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Need some expert guidance. A friend brought over a new Atlas F7 A-B set to run. The A unit runs fine, the B unit would barely move. Took cab off and one motor spins freely and the wheels rotate easily. The other one requires some force to rotate the flywheel, as if a parking brake is on. 

On both trucks the wheels/axles/gears are all free to move and jingle around.

Thanks!

Last edited by BobbyD
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