4 roller crestline water unit


Have a 4 roller crestline water system on a ab dick 375 , there are only three adjustments on this unit , tried to follow the instructions on the installation manual with no luck , am thinking the ends on the form might be a little swollen but still within acceptable range,having scumming problems , any ideas ? Thanks


Well-known member
What does the form stripe measure? The 3 adjustments are easy. They adjust the lift of form to change plates,
One adjusts the separation between the metering roll and form. One is for the form pressure.
The 4 unit Crestline's were known to lose parallel and scum. Drop the op handle to to lower crestline to plate and look at the stripe from metering to form


Well-known member
Honestly even if all of your adjustments seem to be ok, if the rollers are more than a couple of years old you should replace them. Crestlines are like that. No matter what you adjust you're going to have problems with older rollers.


Well-known member
Some ways to check roller pressure are:
Seeing light gap between rollers,
Tension on paper being pulled through nip point,
3 second delay then look at width of stripe on other inked rollers or form to plate.
Swollen roller will put more pressure at nip, reducing water, causing dry-up or catchup.


Well-known member
The metering roller is rubber also just a high durometer. Also the bearings fail in that roller. Also in the frames. Also the frames need to be squared when replacing rollers.


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