Unfortunately, the first word you posted (new) is the scariest part of the problem. The tractor has an electronic governor, (no doubt computer controlled) so fuel supply issues are most likely not involved. Particularly so if you can keep it running by switching the key off and back on. It definitely smacks of electrical problems. Mahindra technical is not very forthcoming with information on problems with there product so be aware the small time dealership mechanics will be mostly winging it trying to figure this out. Hoping for a loaner tractor in the interim will be just that. Hope.New 1626 HST randomly dies with or without load, dealer cant figure it out. No air in fuel system, can save from completely dying by quickly turning off key, then back on. Will die at high or low engine rpm. Help!!