Drive mechanism for a track type work machine having enhanced durability

A drive mechanism for a work machine, comprising:

• a sprocket drive assembly including (i) a hub, and (ii) a plurality of engagement members each being supported by said hub;
• and
• a track assembly having (i) a plurality of shoes which are secured to one another to form a track, (ii) a plurality of drive lugs which are replaceably mounted to said plurality of shoes, said drive lugs engage said plurality of engagement members when said hub is rotated, and further each of said drive lugs is integrally connected to a left lateral rail segment and a right lateral rail segment, each of said drive lugs and said rail segments being replaceably mounted to said shoes with at least one fastener, and (iii) a support roller mechanically coupled to a chassis of said work machine, said support roller includes a left wheel and a right wheel, and said left wheel is supported by said left lateral rail segment during advancement of said track, and further said right wheel is supported by said right lateral rail segment during advancement of said track.