Ron, I guess you still need to find out from the manufacturer what pressure is needed. Volume to turn faster but without enough pressure, it will still slow down in snow. If you pull into a snow bank and it doesn't turn fast enough to blow snow, it could still be a pressure issue as well as a volume issue.
Where are you at that you are blowing snow now?
Your tractor should have dual pumps with the main pump putting out 12 or 17 gpm. A brand new 12 gpm ought to put enough out to blow some snow. However the pressure is limited by the popoff valves on your tractor. Probably 1600 psi, some are at 1800, and you could put in or have a 2200. I think most of the IH pumps are max rated around 2250 or 2500 so the popoff has to be lower.
A lot of this new hydaulic stuff anymore seems to be rated at 3000 psi which is why you need to call the mfr again. The rating should be on a plate on the hyd motor as well.
You also need to flow rate and check the pressures on your tractor. A worn out 12 gpm pump may be only putting out 6 gpm. Perhaps a new one may do it depending upon your pressure and the required pressure. How fast does your loader and other stuff work that runs off that pump. Are you tied in to the larger pump and not the 7 or 9 gpm one that comes off the steering?
With a new 17 gpm ($400-$500)it would help to get an adaptor plate ($50)(I think mkirsh knows where to get them) and use the large hyd filter($20). Then spend another 100 plus bucks for a higher rated pop off valve. I would think the mfr could tell you if it would work at 12 or 17 gpm if you can give them a pressure as well.
If your pump is worn anyway, then you may as well get a new 17 assuming you can make the pressures work. Or look for a used pto hydraulic pump and I don't know what they price out at or even if you can find a good one.
The same principles apply to a hydraulic post hole digger. The more volume, the faster it will turn. The more pressure, the more power it has to turn in hard ground. Auger speed isn't critical in drilling post holes though.
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