I assume the motor is running.
If so, a well used 497 coal loader will start having problems with the bin going up and down due to the uprights wearing grooves into the plastic guides that align the bin with the studs.
It's been a while. The last time I saw this problem, I cut small rings out of brass tubing, and covered the worn plastic studs.
If you have the same problem and you can find a new bin, I'd replace it.
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