Gentleman, thank you very much for your advice, and thank you for taking time to help others who are not that mechanically skilled.
Mr. Kenny V was right all the way ! Thank you very much Sir!
It was the solenoid and the starter.
My problem started when the starter jammed in the flywheel and somehow the magnets inside the starter got loose and this cooked the solenoid.
I re glued the magnets, cleaned the starter, I took the solenoid apart, cleaned the cooked contacts, I put it back together and ..it's alive !!
My tractor is working !
The starter is spinning to the right direction and engages the flywheel...in the previous post I says that the starter is spinning in the wrong direction ..and it was , but now it's all good. ( I don't understand either)
I consider myself pretty mechanically skilled but this tractor is a character. I hope it will never brake down again.
Thank you
Have a great day !