If your using the rear hydraulic hook up they dump to the sump and the charge pump has to push all the oil back to the main hydraulic pump.
When I am putting a loader on a JD tractor like yours I plumb the hydraulics to where they return the oil to the filter cup. This oil then goes directly to the main hydraulic pump with out the charge pump having to pump all of it. You need an external close center valve to do this. You can not sue the rear selective control valves. I also usually plumb the supply form a tee fitting in the rock shaft supply line. This frees up the rear outlets for other use.
I opened my email. So you can email me and we can talk directly then.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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