A cartridge assembly for creating a pin joint between adjacent track shoes in a track chain, the pin joint extending through supporting bores formed in the track shoes , the cartridge assembly comprising: a bushing having a first end face , a second end face , an outer surface , and an inner surface , the inner surface defining a bushing passage shaped as a cylindrical bore , wherein the bushing forms a lubrication reservoir adjacent the inner surface of the bushing and extending towards the outer surface of the bushing , the lubrication reservoir substantially aligned between the first end face and the second end face , and wherein the outer surface of the bushing corresponds with an outer diameter of the cartridge assembly ; a track pin having a longitudinal axis, an outer surface , a first end , and a second end , the track pin disposed within the cylindrical bore of the bushing such that both the first end and the second end of the track pin extend past the bushing , wherein the bushing is rotatable with respect to the track pin , and wherein the outer surface of the track pin is in fluid communication with the lubrication reservoir ; a first sleeve disposed about the track pin and adjacent to the first end face of the bushing ; a second sleeve disposed about the track pin and adjacent to the second end face of the bushing ; a first collar having an outer surface , a first end , and a second end , the first collar disposed about the track pin and the first end of the first collar disposed adjacent the first sleeve ; and a second collar having an outer surface and a first end , the second collar disposed about the track pin and the first end of the second collar disposed adjacent the second sleeve ; characterised in that , the outer diameter of the cartridge assembly is less than a diameter of supporting bores such that the cartridge assembly , comprising the track pin , the bushing , the first sleeve , the second sleeve , the first collar and the second collar , is rotatable with respect to inside surfaces of the supporting bores . a bushing having a first end face , a second end face , an outer surface , and an inner surface , the inner surface defining a bushing passage shaped as a cylindrical bore , wherein the bushing forms a lubrication reservoir adjacent the inner surface of the bushing and extending towards the outer surface of the bushing , the lubrication reservoir substantially aligned between the first end face and the second end face , and wherein the outer surface of the bushing corresponds with an outer diameter of the cartridge assembly ; a track pin having a longitudinal axis, an outer surface , a first end , and a second end , the track pin disposed within the cylindrical bore of the bushing such that both the first end and the second end of the track pin extend past the bushing , wherein the bushing is rotatable with respect to the track pin , and wherein the outer surface of the track pin is in fluid communication with the lubrication reservoir ; a first sleeve disposed about the track pin and adjacent to the first end face of the bushing ; a second sleeve disposed about the track pin and adjacent to the second end face of the bushing ; a first collar having an outer surface , a first end , and a second end , the first collar disposed about the track pin and the first end of the first collar disposed adjacent the first sleeve ; and a second collar having an outer surface and a first end , the second collar disposed about the track pin and the first end of the second collar disposed adjacent the second sleeve ; characterised in that , the outer diameter of the cartridge assembly is less than a diameter of supporting bores such that the cartridge assembly , comprising the track pin , the bushing , the first sleeve , the second sleeve , the first collar and the second collar , is rotatable with respect to inside surfaces of the supporting bores . <EOS>