Posted 5/31/2016 09:36 (#5329756 - in reply to #5329523) Subject: RE: Raven 450
SD
Sometimes the servo valve sticks, which would not allow for a change in pressure. On my old sprayer it would happen after sitting for a while. If one person works the increase button and another taps on the valve with a rubber hammer it may jar it loose.
Raven 450
