Patent ID: 8709246

Claim:
A filter cartridge comprising: an outer shell having a first cartridge end and a second cartridge end, an inlet and an outlet located on the first cartridge end, and at least one cam track located on the outer shell; the at least one cam track comprising a first opposing surface and a second opposing surface forming a channel having an entry portion and an exit portion; the first opposing surface comprising a first upper advancing cam to advance an indexing lug through the channel and a locating detent to engage the indexing lug and to lock the filter cartridge in a service position, wherein the first upper advancing cam is located before the locating detent in the direction of travel from the entry portion to the exit portion; the second opposing surface comprising a first advancing cam and a second advancing cam to advance the indexing lug through the channel, wherein the first advancing cam is positioned before an indexing stop and the second advancing cam is positioned after the indexing stop in a direction of travel from the entry portion to the exit portion; and wherein the locating detent of the first opposing surface is positioned axially away from and after the indexing stop of the second opposing surface in the direction of travel from the entry portion to the exit portion.