Seems the only issue would be if the oil will stay in and not slowly leak out. Hyguard has all the EP additives the tractor needs for hypoid/spur gear and bearing protection. It's the lower viscosity that might be an issue. Normal-grade Hyguard is 20W in engine-oil talk. Winter-grade Hygaurd is 10W in engine-oil talk. 90W GL-1 gear oil is 30W-40W in engine-oil talk.
Just bear in mind that engine oil viscosity is not the same as gear-oil viscosity so you have to put numbers in context. 90W gear oil = 30W-40W oil, etc.
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