Thank you, both of you.
That's the first time I've ever seen that interior pan. The parts list showed the shroud that you have installed and I never could quite figure out what's its purpose was. I had assumed that the felt pad attached to the splash guard was intended on rubbing against a component to keep it oiled. Instead, it appears that it just allows directs the oil back into the pan.
Juki finally called back this afternoon and I talked to a guy who knew what he was talking about. He said that this whole 'system' with the interior pan and splash guard was simply to keep the hook lubricated, like you have mentioned. He said that I could eliminate the pan and simply oil the hook from up above. I had assumed that perhaps other components underneath were required to be submerged in the oil (like a few of my other machines), but that's not the case. I wasn't sure how large that oil pan was.
I noticed a felt pad installed in a tube near the hook/bobbin assembly. I had been applying oil to that for the sake of lubrication. He said that felt pad was actually intended to collect excess oil that got splashed around up there, and that the paid was supposed to soak up the oil and direct it back down to the pan underneath.
Between talking to Juki and your pictures, it now all makes sense. I'm relieved to see that this whole system isn't needed so long as I manually oil the hook.