Even though you have yours up and running, for general info.
I think you said your tractor was a shuttle shift,
a gear tractor can have the engine turned over by putting it in high gear and rocking the rear tires.
My method to roll over an engine on a shop floor or level driveway is to pull back on the tire then push forward,
repeat and you should be seeing the engine slowly bumping over.
Or gentle pulling with another vehicle.
Alternatively getting a socket on the front pulley works.
With a diesel just make sure your fuel cutoff is off, gas engine be sure and disable the ignition.