Have a jd mx6 rotary cutter. I have been using for about 3 years with little problems. Yesterday was clearing some brush at the edge of a creek bank. Backed up to the edge of the bank,lowered the cutter and hit a fair sized hidden stump. Realized what was happening and raised the cutter to discover it wasnt cutting anymore. Pto shaft was still rotating. Turned off the mower and inspected underneath to find the jumper pan and blades were missing which I found in the creek. Not knowing anything about how these shafts/gearboxes work, it is clear that a shaft of some sort broke. I then noticed oil pouring from the now gaping hole where the shaft connected. Should the slip clutch have prevented this from happening? How big of expense am I looking at to get this fixed? What part is broken? I have hit things before but have never had this happen.