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4988Jittery / vibrating group pressure gauge needle

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  • johan yavari
    Aug 4, 2014
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      Is it common for my pressure dial to bounce / oscillate between 8-9 bar when pumping water through the group? I think there might be a problem with my pump's bypass valve, but I want to know if it's normal before I spend much time/money on this.

      Things I've done to diagnose:
      Blvd air from lines by building pressure and cracking open compression nut to the pressure gauge line: no change
      Blank portafilter: pressure builds up to a steady ~10 bar.
      Cleaned / lubed bypass valve nut o-ring: it leaked for a little while afterward but hasn't fixed the issue

      Things seem to work fine otherwise. Still need to work on perfecting my technique.

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