Somewhere around 40-50 years ago usually in late summer our dealer would invite all combine owners in and would have a new combine sitting in the shop. There would be a AC guy there (I think they called him a "Block Man"). He would be the guy the dealer called in if there was a mechanical problem they couldn't solve. He would walk us around the combine and point out things to look for so that we could reduce the odds of having problems during harvest.
Sorry for the long post. Anyway the question on why use ATF in the hydraulics came up.
He said they sell numerous combines into Canada and Hydraulic oil back then would cause problems at -20 to -30 degree temperatures. ATF would flow better there and would also hold up in the heat of wheat harvest in the US.
Steve
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