SM 52 Impression off problem

Discussion in 'Heidelberg Printing Presses' started by old school 52, Nov 17, 2016.

  1. old school 52

    old school 52 Member

    Joined:
    Apr 2014
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    Location:
    United States
    Good Morning,
    Our SM 52 ( 1st unit) will not come off impression in two steps. Goes on fine but coming off it skips the first step then everything comes off in one step. If the feeder trips it sometime sticks releasing air until it trips the press. Removed and cleaned the pneumatic valves top and bottom of piston valve. When running I have a faint air leak in bottom valve coming from sound reducer port.

    Any suggestions?

    Thanks
     
  2. exheidmech

    exheidmech Senior Member

    Joined:
    May 2009
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    674
    Location:
    USA
    Try swapping the entire pneumatic cylinder with the one on the second unit. Most likely a bad cylinder. Impression on/off is software controlled on SM52. Any issues with it coming on or off impression are most likely the cylinder itself. If you have the old style than possibly the valves on the cylinders could be the issue. New style is a round cylinder old style is square.
     
  3. old school 52

    old school 52 Member

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    Location:
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    Thanks for the reply. This cylinder is square. We have replaced one of the valves (bottom) after talking to Heidelberg. Nothing changed. Then swapped it from bottom to top, nothing changed. Is it possible to remove the cylinder and clean it. Seems to me it could be just gummed up. We recently had a compressor full of water which entered the lines. If we do swap the valves between units will the stroke adjustment be the same or need adjusting? Really not comfortable with that.
    Thanks in advance exheidmech
     
    Last edited: Nov 18, 2016
  4. aqazi81

    aqazi81 Senior Member

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    KARACHI PAKISTAN
    Yes, the stroke adjustment is same.
     

  5. old school 52

    old school 52 Member

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    Apr 2014
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    Location:
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    Thank You
     
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