theres an electric switch at the base of the handle that would be the obvious place to start . some machines track with the arm up . try bridging the switch or multimeter it then keep going back until you find the fault i;d guess at worst it will be a solanoid
andy victim of the recession
December 2009
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tractors.