What years of tractors would that part number be for? The parts manual for my '65-'74 3 cylinder models shows the original part number for the S-O-S filter as C5NN7B155A, which has been superseded by part number 309735. I just bought a 309735 a couple of months ago from my local CNH dealer. You might want to check if yours hasn't been superseded with a new part number.
With my dealer, if you just ask for a specific part number and it's no longer available, that's the answer you'll get. If you say "I need a S-O-S transmission filter for a 1973 3 cylinder 4000", then he'll look it up and say, "Well the original part number is C5NN7B155A, but it's been superseded by 309735, and I don't have one in stock. but I can order it for you and it'll be in next Tuesday, unless you want to pay extra for shipping and I can have it for you tomorrow."
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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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