Been through the same problem. After a period of squirting all sorts of penetrating oil on the splines which I felt wasn't getting me anywhere, here's what I did to get the wheels off a '36 B: 1) Loosened hub collars. 2) Jacked up one side of the tractor so the tire cleared the floor by about 8". Placed wood block under tire and lowered jack. 3) Started tractor. 4) On the high side of both hubs I applied penetrating oil (in my case, Gibb's) to the splines. 5) Let the tractor run for an hour or so. 6) Jack up tractor, rotate both tires 1/3 turn, and repeat. 7) Once you have three times, you place the block under the other tire and start over. The idea behind this is that the side pressure on the hub and the engine vibration creates some motion between the splines and hubs. The tilted splines create little reservoirs for the penetrating oil -- between gravity, spline-to-hub movement and engine vibration, a pumping action was created that drew the oil into the spline interface. Then go back to your puller. At least this is what worked for me.
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