hmmmm?
I don't know about that. There are others in the forum running your type PWC, maybe they'll jump in here.
I know that after you remove your pump, you should be able to move the shaft from side to side a little because the pump end holds the bearings and alignment for that part of the shaft. You have it off, so there is nothing to hold it. Be careful not to pull it. Where it's splined to the PTO, there should be a boot that retains it in place.
I think, and when you get into your pump, it's likely that your bearings went bad in your pump and you locked it up causing the shear. Look at the splines to your impellor, do they look clean, no stripping? When you get the impellor off, let me know what you find. If your bearings did lock up your impellor shaft, there may be casing damage...........let's hope that's not true.
Write back, let us know what you find!.......