My Kubota runs great ,but I was driving it and here a kerplunk then it wouldn't move after.i had reverse though for a min ,long enough to get it home them it quit also .is it the transmission.
Let us know the year model as Aurthuritis mentioned . Did it move in 4wd ? Has the fluids and filters been change lately? Reason I asked is on some year models , the fill reservoir for the transmission is not in a normal place and are under the seat in some cases..