4 roller crestline water unit

snoozer

Member
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
 
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
 
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.
 
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.
 
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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