madmapler
01-04-2016, 07:01 PM
Last year I had a 7.5 hp sihi 2 stage on 2000 or so taps and could only get a steady 18" vacuum. The tubing system is new and I spent a good deal of time inspecting things so I'm confident I'm good there. This is a used pump that hadn't been used for some time. It did come from a large farm and I know they don't shoot for 26+ hgs. so I'm wondering if it could be regulated somehow or if the seals need tightening or replacing. I did crank in the seal bolts a little but didn't mess with it much for fear of making things worse. They could be tightened more but I'm not doing anything until I glean a little insight. Any thoughts would be appreciated. Thanks.