There is a 12-part episode where Keith Fenner rebuilds the whole lath which is about the size of your G4003G
Starting with::
Procedure::
a) diasseble carriage from ways and leadscrews.
b) ope up the carriage assembly,
c) find the leaks
d) install new seals
e) reassemble carriage
f) reassemble carriage to lathe and leadscrews.
I had the same problem. I took the left side cover off, there is an area there under the gearbox. It has Lots of oil in there.
I was afraid the gearbox might have a casting flaw causing a leak, I cleaned it with Brake clean and rags, till it was dry.
After a couple weeks I had no more oil leaking to the pan.
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