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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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