I have a fairly new LP RCR1860 cutter with about 40 hours on it. I keep it well greased but had an unusual thing happen. The HHCS 1/2-13X3 1/2 GR8 bolt that holds the driveline to the gearbox shaft came out while using the cutter. I must assume the lock nut came off allowing the bolt to come out as I would think the torque required to break a grade 8 bolt would have tore up the gearbox first. Anyone else ever had this problem?