The rusty area prob means its been partially cracked for a while. At 200 hrs it's hopefully a warranty repair.
In Aus. it would prob be cheaper to buy a new one than cover parts and labour, price it out and see I guess.
Hope you get a better run with it in the future, I like the concept of no belts and bearings.
Anybody have any experience with this? I guess the shaft that comes out of the hydraulic motor snapped. Grinder wheel is totally detached.
I don't know if the whole hydraulic motor needs to be replaced or if I can just get a new shaft.