Is the gear a tapered fit on the hub (collar)? Measure front and rear of the gear to check.
There is something showing on the collar 180 degrees for the gear key. Is it a key way in the hub?
Remove the setscrew in the 9 o'clock position that Roger mentioned. The try tapping the gear towards the gear box. The gear might be finding a set screw in the hub.
If you are definite in your plan to put the PTO shaft direct to the gear box, you can always take a torch and cut the gear and hub off, rather than continuing to spend time messing with it. Do you have a plan for a shear coupling or slip clutch? It really should have one.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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