I just replaced the worn belts on my 424 Diesel and an having trouble with the fan wobbeling when I try to start the tractor. Is there a notch that the fan/pulley component fits in or does the belt tension keep the fan in place?
 
Sounds like your waterpump is "out", as the pulley is pressed onto the waterpump bearing/shaft assembly and the fan is BOLTED to the pulley (with a spacer in between) with 4 - 5/16" bolts.

<img src = "http://i26.tinypic.com/e0levt.jpg">
 
I dunno if id say the water pump is out/ shot.

The hub fell off the pump shaft last week on mine and put a huge hole in the bottom of my radiator.
 

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