Isnt the 830 a totally different tractor than the 990 ? The 830 is of old American heritage, where the 990 was a rebadged David Brown ? I dont have any experience with American Case because the Case name was unknown here untill they took over IHC, which was a very famous name on this side of the pond.
Over here there is just a small cult of DB people, all other folks hate them because of their numerous design flaws.