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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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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