I suspect 80-90 gear oil is too heavy. Most older belly pump hydraulic tractors ran lighter oil, even then they struggled in cold weather. There is also a concern with the EP additives in modern hypoid type oils attacking yellow metal.
But if it has been working, and has now stopped, different oil will not fix it.
That style tractor also had problems with water accumulating in the case. Sometimes that can cause pump problems, especially if it were started up while frozen, or just from the improper lubrication and the associated rust and sediment.
A shop manual will answer your questions and walk you through any repairs. It will more than pay for itself in mistakes not made!
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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