In answer to your question, NO, there's really no way to tell with 100% certainty what fitting you've got until you get it apart. That said, I've been working on all types of equipment for a long time, and on all of the older equipment the most common fittings are either JIC and/or regular NPT (tapered pipe thread). Years ago Dad gave me a guide to hydraulic fittings that was maybe 4 pages thick. It had things like JIC, NPT, Oring Boss, flange face, and maybe one or two others. The latest book has more like twenty different types of fittings, with most all of them being some engineers different take on a standard design. In other words 30 degree taper vs 60 degree taper, inverted flair vs standard flare, the male taper on the female end vs the male end, and vice-a-versa, a small diameter O- ring vs a larger diameter O-ring, etc, etc.
Like I said, basically the same idea, just some engineer making the design just different enough to get a patent and make money for his company. Because of that it's nearly impossible to tell exactly what fitting you've got until you get it loose....unless it's a machine you've worked on enough before to have an idea before hand what your going to find.....which it sounds like you already do. Good luck.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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