I looked on Case/IH parts list for the adjuster for your tractor. They make 2 versions. One like yours, and another that the crank is almost verticle, out the top, but at a slight angle. Looks to be a little more user friendly from the operator's seat.
I googled the part number, for one like yours, and noting appeared. However, the other assembly came up with many results, and are used on lots of models.
New aftermarket adjuster assemblies can be bought in the $80 to $90 range, from just the few I checked out.
Here is the part number if you care to copy and paste, and do a search
3069056R91