It's not something you can tell by looking. You kinda have to know on a tractor-by-tractor basis.
Before the mid 1960's there weren't a lot of closed center hydraulic systems out there. I almost think the Deere 10 or 20 series may have been the first ones to use closed center on a large scale basis.
IH's first widespread use of the closed center hydraulics didn't come until the early 1980's on the last of the 86 series and the 2+2's.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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