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Okay so I have a 686 d312 gear drive. Well I bought a reman starter for it well it just grinds I took the drive off the old starter and swapped it still just grinds. They are both 10 teeth. I’ve checked ring gear it’s fine. I know that the 666 are mostly the same tractor as the 686 but my research shows they use a 12 teeth starter. My question is why is it just grinding, should I buy a 12 teeth starter like a 666. I wonder if the guy before me had the same problems and didn’t count the teeth and stuck a 10 on it. Just need to get this figured out. I’ve never seen it work. I can say that every once an again it’ll catch and start to crank but then just grinds. All help is greatly appreciated. Thanks, Sawyer