Need to determine just how hard the engine is to turn. With the plugs out you should be able to turn it by hand by turning the crank pulley or the fan, holding the belt tight. If so, the problem s still with the starter, battery, cables or solenoid.
If you determine the engine is indeed seized, start looking for the problem. Look at the color of the rod caps, if one is dark, pull the cap and look at the bearing. The rods should have some side to side play on the crank, easy to feel just by pushing with your fingers. Same with the main bearings, look for color differences, start pulling them and looking at the bearings. There should also be some end play in the crank, not much but a clue if it is seized or not.
Could be a seized piston, not likely since it was running, but worth checking. Remember the side to side play in the rod? Hold turning pressure against the crank, see if one of the rods gets tight and won't move side to side. If so that piston is binding.
Just a matter of searching until you find the problem. Start removing accessories like power steering pump, oil pump, anything that turns with the engine.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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