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 - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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