I think that you are mistaken on which bearing you are having trouble with.
1/ The throwout bearing is not brass. It is a ball bearing
2/ The throwout bearing does indeed have a grease fitting on it.
I postulate the theory that you are refering to the pilot bearing, which isn't brass, but bronze although it looks a lot like brass and it doesn't have any way to grease it after it is installed in the flywheel.
If that is indeed the bearing, get a good oilite bearing from a Case/IH dealer. They are oil impregnated and should last 30 or 40 years when properly installed. I always lube them with a dab of a good moly grease anyway, but don't overdo it and get grease on the clutch face or flywheel.
If you are indeed having to replace the throwout bearing every 50 or 60 hours of tractor operation, somebody is assembling it wrong, or the adjustments are seriously way, way, out of whack.
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