Trans flush and refilled. Also engine oil changed.
When I came to adjust the governor, I found the arm was loose on the spindle. That was because the pinch bolt was not tight. When I came to tighten it, the nut fell off. Along with that end of the bolt. New bolt fitted and the governor works as it should.
The tractor is already now to go to it's new home. Being collected some time next week.
I'd like to thank those who have given me advice and support. Much appreciated.