520 is easier on gas & will pull less. Bothe are great tractors. We don't have a 520 but do have a 530. If it's a later model 520 it about the same tractor. Depending on the over all condition I wouldn't bid over 3K on either one unless they are really nice. Grab the belt pulley on the 520 & spin it, make sure the support bearing feel/sounds OK. if it doesn't bid on the 620....We have a M,B,A, 530, 2 60's, 620, 630, 2 730's Diesels. All get used to farm with...
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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