Because the belt is comprised of a white nylon material and is in two halves secured together by two steel pins the point where the two halves come together have to navigate the spindles at each end results in a hangup of the belt at these spindles. So, then the motor turns but the belt fails to move. The belt need to be more supple so it can wrap around the spindles without binding. I don't know who made the original belts, but the MTH replacements were crap. They simply didn't work and they were expensive.
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