1952 model 8N Ford tractors have a fillister head screw (1/4X24?) in the steering column about 2" beneath the steering wheel.
You can fill here if you use 90W and fill from a squeeze bottle.
I usually remove the steering wheel and fill until I cover the top bearing to lube it, then replace the plug and wheel. It may slobber for awhile. Allow it to drain a bit from the screw hole if that bothers you.
If you use cornhead grease, you can remove the screw to act as an air bleed or simly fill until you see grease begin to come out beneath the steering wheel. It helps to remove the wheel.