I have a 2004 Craftsman hydrostatic DGT 6000 with 32 hours on it. All the maintenance has been done to date for reference. For some reason after about 15 minutes of use the tractor won't move if you stop. Even if you push the hydro control all the way forward to top speed it won't move. In fact you get no reaction from the tractor unless you push the lever all the way forward and hold it there you actually can hear what sounds like a grinding noise. Is this a transmission problem or could it maybe be the motion drive belt needs replacing or something else? Thanks in advance for the help!