SU means Special Utility. It was the same engine and chassis as an All Purpose 4000 but had the lighter 3000 front end on it. First photo shows an SU. Is that the front end you have? Second photo shows an AP. The SUs were lower profile and the only ones that used 14.9x28 tires. As I said earlier, centers for your SU will be somewhat hard to find. If you can buy the rail rims for $290 each that is the route I would go. Would save you a lot of searching and hassle in the long run. Those are Very good, reliable, simple to work on, easy to get parts for old tractors.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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