I worked for a steel foundry, actually one of only a handful of steel sand foundries left in the US. I suspect the wheel is ductile iron, not cast steel. Old times called ductile iron "Semi-steel". There's lots lots more ductile iron foundries in the US than there are steel foundries.
We had a solid cast alloy disk about 8 feet in diameter and 7-8 inches thick with a 15 inch diameter hole in the center. The carbon in the steel concentrates under the riser contacts on the cope side (top side when poured) and cracked when the part was annealed for machining. We bought a large round livestock water tank to cover the disk and set a big LP space heater under the center of the casting and pre-heated it for 5-6 hours. We arc-aired the crack, managed to chase it ALL THE WAY THRU THE CASTING! We tried welding it some and just chased the crack farther ahead of the welding. We sent it back to our parent company, the foundry, and ordered another casting for rush delivery. Two years later that danged scrap casting was still sitting around the foundry.
So if the cost of that used wheel is less than what the tractor is worth, BUY IT! You can use the old cracked wheel for weight/ballast on something.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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