Suction on Heidelberg Platen

Hi everyone,

Should the suction bar pick up stock even when the suction trip plunger knob is pulled out? I thought this was supposed to stop any suction from happening.

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It’s supposed to stop suction, but sometimes they still pickup.

Is the filter clean?

you may also find opening one off the sheet suckers part way helps , as well as giving the mechanism behind the sucker control a spray with a light oil loosens the sticky oil a bit allowing some of the sensitivity of those parts to return .