Gotta differ with ya on this one Haas. I've got a SuperC and a BN. On both, there is a nut at the rear (as toward the rear of the tractor) of the fan shaft. On one of my tractors, it's a square nut(though I think the book calls for a hex), on the other it's a hex. This nut slides up and down in the notch/slot on the rear of the bracket that is part of the cast outlet from the head to the radiator. The sides of the slot are deep enough to prevent this nut from turning once it starts to pull down into the slot and well before the shaft is tightened in sufficiently to secure the fan belt tension. The only way to tighten it down after it reaches that point is to turn the shaft to finish threading the shaft into it. For that purpose there is a section of the shaft just in front (toward the front of the tractor) of the bracket that is machined into a hex (looks like a nut) that you can put a wrench on to turn the shaft and thread it into or out of the nut at the back.
If we agree on front and back (basic enough, I'm confident we both know a grille from a drawbar, so there's not too much to disagree about there), yes there is a slot on the front of the bracket. And its much better machined than the one to the rear. That is so that the front is actually flat, to allow for a nice parallel alignment of the belt between the fan and crank pulley. A large flat washer fits over the shaft between the machined hex surface on the shaft and the face of that front slot. Point is that the surfaces of the large nut (square or hex) at the rear of the shaft bind up on the inside edges of the slot to the rear to give you something to turn against as you thread the shaft on and off, leaving you only the section of the shaft "looks like a nut" to get a wrench onto.
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