Posted by redtom on April 26, 2020 at 10:25:25 from (97.84.163.62):
Just reaching out for ideas from anyone familiar with John Bean pumps. At my job we have a tree sprayer used only with a gun on a hose reel. I guess they've had it for 5 years with no issues. Las t fall it seemed to lose some capacity. It is a R20 four piston pump with a 11hp honda all truck mounted. A while ago I replace all the valves, seats, and springs in the head. It would only develop maybe 200 psi of what should be an available 500psi. So I put new cups in the pistons and the ceramic cylinders looked good. I did find a few small suction leaks on some sloppy plumbing from the tank. I redid all the plumbing joints from the tank and even upsized the ball type shutoff from the tank. I blew backwards in suction pipe with air and powerwasher, cleaned the tank, cleaned the filter screen. I had the head apart twice to make sure i did the valves and seats correctly. I had it doing 400 psi friday, but opening the gun to spray would give good spray and then drop off to 100 to 125. The operator of the unit says it always was able to maintain pressure. They used it saturday and and by 2pm it was not hardly pumping at all, almost 0 psi. How come something so simple is kicking my tail? I have been over this and over this. good supply, good rpms, tight belts, good connections. What am I missing. I havent been back to shop yet, I will look at it tomorrow.
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