It is one thing if somebody is paying you to work on a machine, another if you are tinkering on an old tractor on your own time or as a hobby. In that case, time spent identifying and obtaining a standard part is just as good as time spent sniffing a paint can. The ultimate conclusion of the "time is money" argument is that we should scrap the old tractors, buy a new one then hire somebody to drive it. By the way, my nearest CaseIH dealer is at best about a 2 hour round trip, so running over there for an o-ring isn't likely to be the quickest way to get one.
Back to the original question, o-rings are commonly made of EPDM, Buna-N (nitrile), Viton and silicone and a few other things. Each has advantages/disadvantages. If you google a couple of those materials (at the same time) you will probably find several comparison charts. Buna-N is the usual choice for hydraulics. I thought class 6 had to do with food grade and medical use, so unclear why it pertains to a hydraulic part in a tractor. Maybe there is some aspect to grade 6 I am unaware of.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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