I'm working on a 4000 here which has the same governor - putting two engines together to make one.
This engine was running when I took it out of the tractor and tore it apart for the crank.
The governor was Not working properly.
Normally the bell shaped part shown in the photo slides in and out on the shaft freely - you can pull it out with your fingers. This one was stuck and would not slide in and out.
I had to pry it out with a small bar.
You can kinda see in the second photo that there is some old dried up oil on the end of the shaft.
That glued it in place so it wouldn't move properly.
Wouldn't be hard to pull the governor cover and check that yours is sliding freely.
I plan to just use the good one on the engine I'm building.