The pin is tapered and can be wedged in pretty tight. I have had success putting a 7/16" hex nut over the large end of the pin and pressing it out with a 5" C-clamp. Pounding on the threaded end of the pin is a risky proposition.
The driver just turns the impeller shaft. The springs under the driver hold the impeller against the pump housing so it can move the coolant more effectively. The fan hub itself runs on 2 separate bearings which from a practical standpoint will last a whole lot longer than a bushing.
When you have the hub off the housing, there is a pin holding the pulleys on the hub. Look for it at the transition between the two grooves on the non-adjustable part. The pin is short enough to be driven in from the outside. Once the pin is out, press the grooved part off and replace the collar. If the bearings are the originals, consider replacing them at this time.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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