Shuttle transmission problems

[srwven 0]

While spreading fertilizer tonight, I started having problems with my 7014 shuttle. When going up steep hills and starting out, sometimes it would hesitate, or seem like it was slipping and make a sort of grinding noise then it would catch and be fine. The belts look fine, have a nice v to them. The pulleys are a little shiny though. Would it make that awfule noise if it were just the belts or pulleys? It goes into reverse fine. I haven't learned much about transmissions, yet. Any help would be appreciated.

[MPH 12]

I have no experience with shuttle's yet but if you have a manual and pretty good set of tools don't let it scare you into parting with the tractor. I just totally redid my B112 3 speed with some new parts and lots on B10 parts. Couple hours at a time in the eveings..hope you solve it simpler. good luck MPH