Posted by cadet trooper on June 26, 2008 at 17:21:31 from (69.223.42.160):
In Reply to: Re: VFD posted by CBBC on June 26, 2008 at 16:21:58:
CBBC, are you pumping from a well or a creek? cause it sure sounds like you're drawing air or your pivot is draining back do you have a check valve to keep water in the system we had the same problem with our diesel pump but had to bring it up slowly to evacuate the air or it would blow the victaulic and make an 8' hole in the ground in a heartbeat. VFD's usually are about the cost of the motor soft starts usually work on timers so you would have figure out the time delay it would take to evacuate the the air I don't understand the bleeder idea because that is what your nozzles and guns do unless they are too restrictive you have to remember the water becomes a giant piston an 8" X however long the pivot is X velocity another words a giant hydraulic cylinder so you have to dump massive amounts of air quickly.
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