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HELP 712 won't start

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I have heard some sort of grinding coming from the starter unit on my 712H. I took out the starter and looked at the teeth and put it back in with some lube on the spiral teeth of the shaft(sorry if used wrong word). Well put It back in and makes a sound like the impact wrenches do. I think the spiral teeth on the shaft are stripped letting the gear with the teeth that hit the fly wheel slip.It sounds horrible and won't turn the engine over. Does this mean I need to get a whole new starter or gear or what. if a picture Is needed to clarify my question I can do that tomorrow. Thanks for your help.

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I think It is the shaft but I took the starter off of the john deere 316 and I has a spacer at the end of the gear the Ac gear spins about 1/4" more than the one with the spacer. I have no clue. should I go and put a washer or go find a spacer

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Best way to adjust the depth of a starter gear engagement into the flywheel teeth is with the air shroud off the engine. This way you can turn the gear till it is sitting in the right place and then determine if it needs shim washers because some factory plastic part has broken and fallen off. I had a starter on a B/S Vanguard break the plastic stop which allowed it to hit the flywheel hard enough to prevent it from turning. I pulled the pin and added washers till it stopped in the correct spot. Still working fine for the guy I sold it to.

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