The 1850 and the 1855 had different hydraulic and PTO setups did they not???
I know I owned a Oliver 1755 for just a short while. It had a closed center hydraulic system with the hydraulic pump mounted on the side of the tractor externally. That tractor always seemed under powered. My 1655 would out work it.
Then my Oliver 1655 would be more like the earlier 1800 with the central hydraulic pump that is internal with the PTO shaft running through it.
I have had that shaft out of my 1655. When it just had 1500 hours or so the transmission input shaft locked up in the needle bearings it ran in. Never could figure out what caused it to lockup.
On your 1850 that shaft runs through a angle gear drive for the hydraulic pump???
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