My mf50h backhoe will not move forwards or backwards.

I think my 1995 Massey Ferguson 50 h has possibly got a bad solenoid that is causing it to not engage the drivetrain. I am new to the bigger equipment so do not know a lot about operating controls. I think I might have pushed some sort of emergency override system and now it will not disengage. It ran fine when I parked it and 30 minutes later it would not move forwards or backwards. It runs fine everything else works it simply will not move.