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Kuhn disc mower jamming

Sometimes when I replace blades on my old Kuhn disc mower (GMD55S), it doesn't want to turn.  All of the discs seem to be jammed.  By wiggling them back and forth, I can usual unjam it and get it turning properly.    The oil level is good, the belts are good, nothing is dragging or jamming on the outside.  


I presume that I am doing something while changing the bolt and blade that is causing the geartrain inside to jam.  Any ideas on how to avoid this jamming?

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