Had to replace the starter three times now in 13 years. Turns out that the soft cheap copper the Chinese use in the starter motor for the contacts, welds itself together until the starter catches fire. Have replaced key switch, starter circuit relay three times, finally went with a Ford relay. Still did not fix the problem. The new starter worked for a while until the internal copper contacts would be pitted really bad and then keep the starter in gaged until it caught fire and almost lost the machine, more than once. I would rebuild the contacts by machining copper washer smooth in the lathe, files the copper bolt heads flat. This works for about a year, then it starts sticking again. The skid steer has a Kubota 1903 engine. This is something I keep an eye on all the time when starting the skid steer. When I forget to check this, that is when the starter stays in gaged an burns up. Now have 3 new starters sitting on the shelf waiting for the one in the machine to melt down.