I hope the "naysayers" haven't talked you out of a possible simple solution. I used to work on electron microscopes and had occasion to see epoxy bonds at magnifications of several thousand times. Epoxy can bond to a glass laboratory slide so tightly that, while drying, it can cause the slide to shatter from the slight shrinkage and super adhesion. For about $5 you can buy the long-cure JBWeld and give it a try. It will work fine on cast iron, cast aluminum, or your favorite casting rod./w3tcompact/icons/laugh.gif
All kidding aside...Take your hub off your tire, clean both surfaces, mix the epoxy according to instructions, apply to both surfaces, place the pieces together and let it set for 24 hours to cure. After the cure, put your wheel back on (lugs just snug). Let your wheel down until it is supporting normal weight and then rotate your steering wheel left and right to "test" your bond. If it works, you can thank me for the idea and take a picture to send to JBWeld. If it doesn't, I'll take all the abuse the other guys can dish out. I'll even do it with a smile. /w3tcompact/icons/smile.gif Check out this info from JBWeld's website. They are suggesting repair of a broken or chipped propeller on a boat and it has been used by many to repair engine castings. There are many types of this product, but for your temporary
repair, I think the off-the-shelf variety at the auto parts store or hardware store will work fine.
<A target="_blank" HREF=http://www.jbweld.co.uk/files/prodb.html>JBWeld</A>
The most important thing is that you get your tractor back to the dealer as quickly and as safely as possible. It doesn't matter how I or anyone else would do it. I'm sure you'll make the best decision for you.