Ford 650 backhoe hydraulic problem

big job

New User
I am now a new member -thank you- little history, we bought
this new (local dealer) I use it more for a loader which is a bull.
load 10 wheelers with ease. I maintain my machines so this
is not fluid /filter or pump problem. Now the problem is, it will
lift fine and fast AT idle, any amount of RPMs it slows and a
buzzing sound behind my seat (area of backhoe controls). I have
all the manuals and a $100 master repair book kind or worthless
trouble shooting section. My mind says-some kind of relief or
diverter valve stuck; again, buzzing I hear and feel it through the
floor behind my seat.... So I will take the rear floor out, question
is what do I look for? book don't show it. Also the buzz noise
is constant even to drive around but just nursing the loader
handle up just a little it goes away sam

snows comming I need this...............................
 
Either you're really low on fluid and it's sucking air, or your suction screen is plugged and the pump is cavitating. Those are the first
ideas that pop into my head.
 

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