water pump shaft size

I am replacing the shaft in a water pump on and early 4020. Installed the shaft and the fan hub just fell on. The new shaft is .006" smaller that the old shaft. Part number is JD9212. Am I supposed to buy a different hub? The parts book only lists one.

What gives here?
 
I have seen hubs 'slip fit' after being pressed off too many times,,this is not good for the radiator,,on older tractors I add a new hub to the O/H to make sure the fan don't draw it off, but your old hub should not be that loose ..the shaft is larger on one end, could you possibly have the wrong end in?? and the kit has to match the pump housing number also.. post the housing number off the pump and I will check the numbers for you..
 

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