what's the other end attached to ?
a more general/wider field of view would help ... red thing might be the slew drive? but am not familiar with this later model ... you are going to get some oil loss - do you have any plugs to put in the open fitting ends?
View attachment 53596 come in various sizes -
I've also found a cable shroud works well too
View attachment 53597
tightness depends on the type of union ... tapered cone = reasonably tight, O ring seat/face seal doesn't need to be over dogged - ditto metric ends don't need to be too tight either ... hard to describe to an unfamiliar 'hand', just how tight, other than nip them up and then give it a little more, with a good nip down for the tapered cone type