I just bought a Kubota I think it is a b2150dt I don't understand the hsd hst and stuff and I don't know the year the previous owner did not know either. the problem also is that when I turn the tractor off it wont I have to pull a fuel knob lever then it shuts off. the tractor will without starting it just turning the key to the on position and then off make a cliking sound after a few seconds so im assuming some relay or thingy is working to try and shut it off but it wont any help or advice.