Abstract: A power train for driving a functional mechanism of a mining machine includes a sealing mechanism extendable across the space between drive and driven units in the power train and surrounding a drive shaft extending between the two units. The sealing mechanism includes a tubular seal carrier with one end portion which is sealable against an annular seal face on one of the units and an opposite end portion which is sealable against a sealing ring surface on the other of the units for sealed protection of a drive shaft connected between the units. A clamp is connectable between the one end of the carrier and the one unit to pull the carrier into sealing engagement with such unit while maintaining sealing contact with the other unit. When the clamp is released, the carrier is free to be moved into a retracted position freeing the space between the units to be used in removing either of the units from the power train.

Abstract: A securing nut apparatus for detachably connecting and clamping a machine component onto a shaft includes a nut hub body having a threaded main bore and a nut outer ring. The nut outer ring cooperates with the nut hub body threadably engaged to the shaft to provide a uniform clamping force to the machine component. A plurality of screws couple the nut outer ring with the nut hub body. A threaded engagement between the screws and threaded openings of the nut hub body forces the nut outer ring therebetween into a high uniform clamping force against the machine component.

Abstract: An improved cutting head for a mining machine having a rotary cutting head and shaft removably and rotatably attached to the forward end of a mining machine such that the shaft and cutting head alone may be removed from the forward end of the machine and repaired at the site where the mining is taking place.