On the 7700 in own, the conveyor auger is pretty much the same setup as the 9000 series. The grease zerk on the pulley greases the shaft so if the clutch slips, the shaft won't get worn by the pulley, which will still be spinnning. On the 7700, I replaced all of the bearings which were of the sealed type, so all the zerk is for is the spinning shaft.