SP25 ink drum “bouncing”

The ink drum on my SP25 has started bouncing up and down at one end as soon as any slight pressure is applied, like when I lower the form rollers or when I wipe off the ink while the drum is turning.

I can’t see any visible irregularities in the chain links or any of the three sprockets. I assume the next step would be to remove the ink drum so I can take a closer look. But I haven’t done that before, so before I take that step, I want to see if anyone has any idea what the problem might be.



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The Arm
4 years ago

Is the drum inking light or not at all at one end? If you grab ahold of the drum, can you move it up and down at the front or the back? It could be that one of the interior bushings has failed and needs to be replaced. If you go in there, swap them both.


Paul Moxon, Moderator
4 years ago

Most likely one of the drum springs has failed, meaning simply stretched. Replacements are availble from NA Graphics. You’ll want part X-20563. Removal and installation is made easier with a spring hook tools available in most hardware stores.

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