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Ford 9N, 2N & 8N Discussion Forum
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Transmission bearing surface finish

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Paul Wirt

08-06-2005 13:25:04




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Have the transmission apart on our 51 8N looking for another problem so am doing and inspection on the parts. How much inperfections of the cup bearing surface of the main input shaft (2N7017)have you had and lived with? I notice there is a pit as well as a couple of other crossing areas where the thumbnail slightly catches. I know this is not a replacable cup and the the surface is machined into the end of the input shaft. Mating cone shows marks so will replace it, in fact will replace all the cones, cups and the input shaft seal in the transmission.
Use tractor something like 25hrs a year.
Thanks for your input.

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ZANE

08-06-2005 16:12:48




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 Re: Transmission bearing surface finish in reply to Paul Wirt, 08-06-2005 13:25:04  
To my knowledge there is not cup in the transmission that is not replacable.

Zane



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Rob

08-06-2005 16:35:27




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 Re: Transmission bearing surface finish in reply to ZANE, 08-06-2005 16:12:48  
That input shaft (7017) shows to have the main drive gear (7017) on the end. That gear is part of the input shaft. So the parts book shows. The inside of the main drive gear is hollowed out into a outer bearing race.



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Paul Wirt

08-06-2005 18:15:55




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 Re: Transmission bearing surface finish in reply to Rob, 08-06-2005 16:35:27  
Rob
You are correct as I had the part in front of me. The cup is machined in the end of the input shaft, like it is the center of the gear in fact.
I would say the way they are made is the shaft is forged, then teeth cut in it and then the center of the gear is machined out and then centerless ground to get the cup shape and finish and then the whole thing is hardened to get the wearing surface and strength needed.

I may go down to Cooks Tractor (monthly auction place and very large farm machinery salvage yard) next week to see what they have in a good used one and then make a decision.
Thanks

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ZANE

08-06-2005 17:39:47




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 Re: Transmission bearing surface finish in reply to Rob, 08-06-2005 16:35:27  
Since you jogged my memory I think you may be right on the input shaft. To tell the truth it has been a long time since I saw inside the 8N transmission. I can still see most of the parts in my brain though. :O) Some a little dimmer than others.

Zane



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Rob

08-06-2005 13:44:26




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 Re: Transmission bearing surface finish in reply to Paul Wirt, 08-06-2005 13:25:04  
It"s not good to leave that on a bearing surface. That"s not many hours/year so you may be fine if you"re ok with some bearing noise.
I"d take some or all of it out with emery cloth. Start with 80grit and hit the the bad spot 25 licks, rotate the shaft and hit it with 25 licks and keep doing that to take it down even all that way around. I get it out then I would go to a finer grit emery to put a finish on there. But then I might get tired of that before I got the pit out and just call it good enough.
You"ll be ahead by whatever you work out before you reassemble.
You can only blame yourself if it"s whining next August. Have fun.

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