Re: Hydraulic pump and valve ?
I ran a pavement breaker back in the mid 80's at McConnell air force base in Wichita Ks. We were wrecking out some old parking ramps and runways and beefing them up to accommodate the new B1 bombers. It had a manual and auto on it as well but I don't know the workings of it.
As for the valve there are way more qualified people on here than me to answer your questions on it. Best of luck on your build.
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Joe
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