You have things pretty well figured out. Just a few details might help clear up what you can expect. The rotating hub is made of three pieces. The front hub contains the bearings and seals. The middle one with the set screw is the belt adjustment. Lastly is the stationary half of the fan pulley and the generator drive pulley. All threaded parts are right-handed.
To get all of this apart, it has to come off of the pump housing. Now, it doesn't matter if you want to remove the radiator or take the pump off the block. You'll have to do one or the other.
To remove the hub from the housing, remove the gland nut from around the impeller shaft. It holds the pump shaft packing in place. You don't have to dig the packing out, but plan to add a few new pieces back upon re-assembly. Behind that is a nut that looks like a spacer. It has two wrench flats machined on it. Once the nut is off, the hub can be pulled off the housing. The bearings are a light press fit around the 'snout' and might need a light tap depending on the amount of grease the hub bearings received during its working life. Use a non-marring hammer as the spindle is threaded both internally and externally at the end.
Now to remove the fixed half of the pulley from the other end. There is a locating pin about 1/8" in diameter that is in a hole drilled at the step between the generator pulley and the pump pulley half. It can be difficult to find if there is still paint on this area. Drive the pin on into the center of the hub with a small punch. You can retrieve it later when you clean everything up to put it back together. The fixed half of the pulleys can now be pressed off the back. Be careful because the end of the hub runs against a felt dust seal that is in a recess in the housing and if you nick the end it will chew away the felt and there won't be a seal any longer.
Now you can remove the cracked hub. If you clean the parts up well - I use a glass bead blaster - assembly is easy. I recommend new bearings and seals now as you probably don't want to go back into it again - ever.
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Today's Featured Article - Magic Moments - by Tyler J. Woods. Magic moments don’t just happen. You have to help them along. This morning, I got up early. It is my day off from my regular workweek and I had a lot of things to do. It’s fall, and with winter coming on, there is a lot of work to do before weather closes in.
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