Search the Community
Showing results for tags 'not releasing pressure from group'.
Found 1 result
Hello all, sorry to drop in after years with a question I find the time difference a bit restrictive from Oz and I don't get on with coffee snobs so well so I thought I'd come back and beg forgiveness! I have Gary dykes old expobar brewtus. At the end of the shot when I put the brew leaver all the way down (into the exhaust position) it doesn't release the pressure from the group head. If I push back hard it slowly trickles out. I thought it might be a scale/cleaning issue and most searches seem to suggest that. But I took out the mushroom and it is immaculate in there. I also took out the bottom section (the drain chamber) and that looked ok too. So I *think* to me it looks like the operating Cam is warn down and isn't applying enough pressure on the drain valve. It doesn't look that warn but I can't think what else it would be. Just to add one final bit of information it actually flushes much better when the machine is cold. So something is expanding a bit when it heats up, the margins must be pretty fine. I say all this with caution, I'm a software developer not an engineer. But I'm glad to have taken the group head apart. Makes the diagrams make sense and they are remarkably simple. If I am right and it is the cam I couldn't work out if you could just remove that bit or where I would find a replacement cam. A google search revealed nothing