Posted by Weldon K on March 21, 2017 at 19:56:02 from (69.40.35.116):
In Reply to: Re: What is an 856? posted by IH856custom on March 21, 2017 at 13:08:30:
The model designation of 856 tractors, be it an 856 Farmall, 856 Farmall Custom, 856 International or 2856 International Industrial has nothing to do with the part number of the IPTO drive shaft that is in a tractor. What does make a difference in the part number is WHEN the tractor was built , hence the serial number break in both the Farmall and International models. IH changed the angle of the cut on the gears in the transmissions while the 56 series tractors were in production.
I believe that you are referring to the IPTO drive shaft illustration number 31 in the first diagram above. That drive shaft meshes with driven gear illustration number 41 in same diagram above. Parts numbers and serial number breaks are in parts number listings. When replacing the drive shaft, the correct shaft must be ordered according to serial number of tractor. Both the drive shaft and the driven gear have to have matching gear angles or you will get the noise that you say you have.
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