I am on my first pump and OPV, 4-5 year old Brewtus II and have a similar problem. In my case I can pull the first shot of the day just fine, 30-35secs full 10-11 PSI depending on the tamp just fine. However, 2nd shot and the pressure falls to 6psi within the first 10 seconds and the pump gets abnormally quiet. The shot continues though at this lower pressure. I have no problem backflushing though - with the blind basket I get full 10-11psi pressure and don't see it drop although I don't typically stress the pump and hold it quite as long. Any recommendations? Pump? OPV? Thanks.
On Wednesday, June 19, 2013 9:34:22 AM UTC-4, whatwud zombeesdu wrote: > > Did you ever get this resolved? > > You are not the first person to experience this problem. I have had the > same problem with my Brewtus 1. > > On Friday, March 29, 2013 7:51:44 PM UTC-4, billherbst wrote: > >> Given my history with this Brewtus, you might be right. This would be my >> fourth OPV in four years. Last time, I bought two, just so I'd have a >> backup the next time the OPV went loopy. >> >> I left out a couple of potentially significant facts in my first post. >> One is that I changed grinders three days ago. My Baratza Vario had been >> slipping on the coarse setting during grinds by one notch (in spite of >> having the shim kit installed), so I finally swapped it out for my backup >> grinder, an Ascaso i-Mini, which I've been gradually getting dialed in. The >> first couple pulls were way too coarse, then one yesterday was way too fine >> and choked the machine. Maybe the OPV had a stroke. >> >> The other fact is that two nights ago I backflushed the Brewtus for the >> first time in almost a year. I just backflushed again about an hour ago, >> and the pump does the same thing as when pulling a shot---preinfuses, then >> goes to 9 bars and chokes, with that same decrease in pump noise. The only >> difference is that the pressure doesn't fall from 9 to 2-3, since there's >> nowhere for the pressure to go with a blind basket. I don't let it run that >> way for more than a second before closing the pull lever. >> >> So, I'm thinking what's going on might be different than I assumed. >> Perhaps the pump is OK, in which case, as you say, the OPV might have >> bought it when I backflushed four times times two nights ago. >> >> I'll keep troubleshooting for a day or two before I swap out the pump-OPV >> assembly. >> >> Thanks for responding. >> > -- You received this message because you are subscribed to the Google Groups "Brewtus" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/brewtus. For more options, visit https://groups.google.com/groups/opt_out.
