NH478 rollers

I broke a chain several weeks ago on my NH478 haybine and I think the rollers came out of time. How do I reset them. It makes a loud knocking noise and the roller jumps at times. It does not do it all the time. Thanks
 

On my 411 there are four bolts around the left (drive) end of the upper roll that you just back off a little then it moves separate from the drive shaft.
 

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