brians in sd
New User
I have a 1970 JD 4020 diesel that will not shut off especially in summer or when the engine is warmed up for a while. But it also would not start either sometimes until you "bumped the switch" several times, so I replaced the ignition switch thinking that it could be causing both problems. Well, it solved the starting, and it starts fine, but sometimes in the worst case situation I have to kill it in road gear and pop the clutch. But in most cases if you turn it to off position, it will run maybe less than a minute and shut off. I have checked the lead going to the Roosa Master pump with a test light, and with the tractor NOT running keyed the switch back and forth and it tests out like it is supposed to. Any thoughts what I need to check out next?