Thanks, guys. Mobil DTE-26 is an ISO 68 oil, so I had the right stuff...just not enough of it. The headstock level is slightly high in the sight glass using the capacity from that manual, but the gearbox oil level didn't reach the sight glass before I ran out. According to that manual it should have, and left enough to change the apron oil too. More is coming tomorrow to finish the gearbox and change the apron oil.
I have a copy of the manual someone posted the link for. Some of the things in it don't match the 1440E. So far, these include the headstock oil filter, the oil capacity, and the drain location for the apron. I'm sure other things differ as well, including part numbers for this and for that. There's a copy on Amazon for $65, but I was hoping someone might have it in softcopy.
Another question is which position is supposed to be forward and which is supposed to be reverse. Up for forward, or down for forward? The new RPC is phased correctly for the mill and hooking things up per the color code made the lathe start in forward pulling up on the lever, but that (unmatching) manual says forward should be down. It doesn't seem to actually matter, but...