About to embark on cylinder carriage adjustment-Universal III AB

The symptom: The top of the bed has less impression. At first I thought maybe the adjustable bed could be at fault, but a level revealed it pretty even from top to bottom center, but the operator side corner top appears to actually rise, in complete contradiction to my problem of less impression at the top in general. (toward the cylinder)
A roller gauge inking test shows that in trip there is no line when it is placed at the top, and at only about 8 inches from the the top does it show a good stripe. So it would seems that the bearers traveling over the bed are the problem.
There does not appear to be any wear or metal shavings on the rails and they are clean and oiled.
So am I right that this is what needs to be done? I’m about to start a project and I really would like to solve this once and for all. How does the eccentric adjustment improve an impression variance in travel? Or is it the bearings needing replacing…

I will do the test for impression-after getting my form out of the way.
Got none of those feeler gauges, though David says you can get a kit of them, they are just not as long as the ones Paul showed us. Or use paper.
Any tips/reminders appreciated!

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Eric Holub
9 years ago

I would suggest that carriage adjustment and impression adjustment are two different things, at least on Universals and SPs and 4s. Impression is just the cylinder and bed bearers being held together with minimum pressure needed to prevent bear-off, and on this model is the bearings that are adjusted against the upper rail. Adjustment of the whole carriaqe affects the difference of roller height between trip and print, and here would be the adjustment of bearings against the lower rail. In both cases the bearings should be adjusted so the carriage is level and not tipped. When correct, rollers will be at same height on both trip and print. Very fussy work.
Add an adjustable bed and there are more variables. I hope those who have tried to reset AB models will chime in.

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