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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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