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John Deere 850 rear crankshaft seal

carkivey3 Join Date: May 2025 Posts: 1 fayetteville,nc

2025-05-20          201887

I recently rebuilt a 86 jd850 with yanmar 3 cy diesel. Among other things the crankshaft was turned down .030". the rear oil seal also rides on same journal as the bearing. Did not think of it at the time.

Tractor back together and running great. however, I do have an oil leak out of bellhousing and I am sure its because now the oil seal is .030" too big.

I would like to have a new seal to install before seperating tractor. there is only one rear seal listed as parts. i would like the manufacturer info to determine outer dimension. Service manual has crankshaft at 3.542". minus the .030" =3.242" for seal id. John Deere just refers me to part numbers. Yanmar was very helpful but basically said against policy to give info about where they get parts. anyone have any info that would be helpful

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