Removing a coupler?

I have a 630 nh hay roller that needs a pto coupler replaced on one of the shafts. I found what I need for replacement but now I?m trying to
figure out how to remove the old one. The coupler was drilled and welded to shaft which needs to come off. Any ideas? TIA.
 
If it is like most I have replaced I just take a grinder and grind off as much of the old weld as I can then take a hammer and try to pop it off then once off grind the areas smooth and weld on a new one
 
You can also use the angle grinder with a .045 cutting disk. If you are very careful you can make perfect cuts and the new parts slip right on.
 

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