Help with ´index´...

Guys, maybe someone can help me here...
It´s a technical translations, about how a machine work, and the word ´index´ is used many times, but as a verb, and it has nothing to do with ´indexar´or ´indicar´ in this context... it´s more related to some function of the machine...
I´ve been trying to check it with some good source, but so far... mmmm.

here´s some context:

The filters will index in sequence and will inflate the seals.
Index controls will be disabled.
Because the system is in manual mode, instead of indexing, system will run a continuous index.

Thanks a lot!!

See if this is clearer (it describes a machine)

http://www.pdc-inc.com/dial-index-machine.htm

:)

yeah, it helped, and it was one of the functions of the machine...thanks!