Are you sure ur tractor isn't female? LOL!!My B1750 all of a sudden started driving backwards. If I push the pedal forward it goes in reverse. If I push pedal in reverse it goes forward. All linkages look fine nothing lose.
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This is what I thought of too.This may sound stupid, but the only thing I can think is ( because you didnt mention anything about hoses or any maintenance done ) your engine spinning reverse, hydraulic pump spinning wrong.
Oh we are the bearer of joyful news!Sounds like one of the valve plates in your hydro has broken or turned out of position.