Try cleaning the grooves in all the pulleys(crank too) with a wire brush and some brake cleaner. Clean the belt too if you used anything on it. And make sure the belt is not too long and the tensioner is doing it's job.
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i'm pretty sure that you're not supposed to disassemble sealed bearings. i may be wrong though. if it still moves smoothly and doesn't have any wobble then it is probably fine.
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