George help me understand this a little better. Let me use some numbers I pulled out my head to explain.
There is a tractor that holds a total of 5 gallons of hydraulic oil. With the cylinders all the way closed there is 4 gallons in the sump and 1 gallon in the hoses and cylinders. With the cylinders all the way extended there is 2 gallons in the sump and 3 gallons in the hoses and cylinders.
So I want to change my oil. I close all the cylinders. When I drain the oil I get to replace 4 gallons that was in the sump. There is still 1 gallon in the system that I can not drain because it is in the hoses and cylinders.
So I try something different. I extend all the cylinders. Now I drain the sump and get 2 gallons of oil. I then open the valve and physically force the cylinders closed forcing 2 more gallons into the sump that drains. I drained a total of 4 gallons now because 1 gallon is still in the hoses and cylinders.
So can you explain to me what I did different by starting with the cylinders all the way open or closed other than getting a little exercise by having to physically force the cylinders closed with brute force.
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