We have a No. 4 who is the work-horse of our print shop (at MCBA). In recent weeks, it has started an awful chattering noise, that continues to get worse. At first I thought it was the gear and the clutch on the form rollers that were rubbing together. But on closer inspection the gear appears to be dragging over the rails, making a loud and unpleasant sound. Almost as if the roller is too low, and dragging some how.
Here is a list of the things I have already done in an attempt to repair this problem:
- replaced with new MR-112 collar. The end of the roller core where the indents for the set screws to the collar fits is quite junky and marred.
- replaced with new MR-110 pin
- replaced with new MR-111 gear.
- checked and shimmed the plate on the outside of the rail where the clutch plate connects
- resurfaced the brass clutch plate itself.
Because people need to continue using this press, I have devised a work around. Each time the carriage returns to the top of the bed, the operator must raise the rollers and “gently” set the rollers down again. It’s a pain, but it works.
Looking for a more permanent and concrete solution I looked to the vanderblog. Reading through this post https://vandercookpress.info/2010/08/new-rollers-slightly-different-diameters/ I read tell of raising the top distributor rollers slightly. A fellow named Eric described it in 2010. For the life of me, I cannot figure out what he is talking about. I have also measured the diameter of our rollers, and they seem smallish to me. The rubber was replaced in Jan 2010. Shouldn’t rubber rollers last longer than 5 years? Is it time to replace them?
Any advice is helpful. I am not afraid to get in there and do the work, I have just run out of ideas on this one.