On my 3320, which would be a newer replacement for your tractor, there is a circuit board that corroded and had voltage problems and caused the ehydro system to not function.
Welcome to TBN,
This issue is most likely much more involved than a simple fuse unfortunately. Start by checking the wiring under the pedals, and seeing what codes are flashing on the display.
You can purchase the CD version of the shop manual for about $100 I think too.