This is a tractor that should have got it right. I have been having a problem with starting and it appears it is not uncommon from searching Google.
The problem comes from the starter relay. This would be an extremely simple problem to diagnose if it weren't for the absolutely stupid location of all the relays, which is the very last place you would want to check as it requires pulling off the steering wheel. Good luck with that if you don't have a puller and don't want to damage anything, the starter switch, light and hazard switches, the dash cowl (requiring the linkage to the throttle control to be disconnected so it turns to the stop), the instrument panel then you can pull off the relay (Second from right) and check it.
The electrical check is relatively simple and takes about 30 seconds with a multimeter. The problem is likely to be just dirty contacts. My system seems very sensitive as the contacts looked okay but all that was required was to reseat the plug and give the whole area a good clean. I question the mentality of the designers when they locate critical electrical parts in inaccessible places open to dust and NO Maintenance capability. It is frustrating to see a great little tractor let down by a stupid design.