Sorry, been out of town.
What you have is a 2" well with a Sta-Rite deep well jet pump bolted to a casing adaptor. You can unbolt the pump from the casing adaptor by unscrewing the two 3/4" head bolts from the bottom of the pump. Then you have more bolts squeezing the rubber flange at the bottom of the casing adaptor. If you loosen those and turn or move the casing adaptor, the pipe will now have to come out. Once you break the leathers loose down the well, they will not seal up again. Pulling a jet is a very hard job, one we do with a pump hoist with a walking beam so we can beat them out of the well.
My advice is to unbolt the pump if it doesn't work and install a new one that will fit the casing adaptor. The choice of pumps is Sta-Rite MS series, National pumps MSV series or Myers MVP series. No other pumps will fit that adaptor.
If you are not careful and drop a piece of mineral scale or gasket down the two holes in top of the adaptor, you will plug the jet and it will have to come out anyway.