Belt change on DS 60 deck

[dslanec]

I have the sx3100 tractor with DS 60 mower deck. I have been mowing with it for 5 years now so I figured I should change the belt. I never received a manual when I bought it. I got a bit confused when I tried to change it today. Im assuming I have to remove the gearbox in order to do this. Is it easier to remove the gearbox from the bracket or remove the whole bracket? Anyone done this before?