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Message: <blockquote data-quote="jameslmarchetti70@gmail.c" data-source="post: 137349" data-attributes="member: 24475"><p>Just a thought on this one.  I once had a low flow to a digger derrick system and The lead tech could not figure it out or where the issue was.  I being an airforce tech,  fresh out said It happend under a load?  Flow meter and all that used and the flow was low.  More when the quick disconnects were put together.  I then in passing said check the quick disconnects to see if a blockage happened or one broke.  Turned out one of them disintegrated internally and under a load it shut off the flow.  Not that it's what you have there but who knows. That dump valve you mentioned we called a deadman in a bucket truck it is designed to dump system pressure if an injury happens.  Maybe that is bad or leaks.  System relief valve weak and under a load will open also  Hard to say without being there to see what takes place.    Good luck with all that.</p></blockquote><p></p>