Spanish to English Tech/Engineering Transport / Transportation / Shipping

This is from a report detailing the methodology used to test training packages for potential gantry crane operators.

One of the things assessed is how good the candidates are at moving containers around in a simulator:

Dimensión psicomotriz manipulación: adecuación de la manipulación de la carga in situ (p.e., en grúa pórtico: enganche-desenganche contenedores, utilización flippers, control en traslado carga)

I think I understand the general idea: that the crane is grabbing and letting go of the containers. But I'm wondering if there's a specific term for how the crane attaches and detaches itself to the container.

Terms I've considered so far are: locking and unlocking onto the container; engaging with and disengaging from the container; hitching; and coupling. "Hitching" I don't think is right because, as I understand it, this type of crane does not have rigging as such.

Another thing is that, although it seems to be easier to think of a gerund to translate this, I need a countable noun if possible because the speed with which the operators work is measured in terms of how many "enganches/desenganches" they undertake per hour. But maybe I'm asking for too much...