If you have oil leaking from the attachment hub, the transmission grease has liquified. The transmission will need to be opened so the old lubricant can be removed, by scooping it out. There aren't any seals in the attachment hub, just two torrington needle bearings. The helical gears thrust the pinion gear onto a thrust bearing in the hub to create a seal. The hub has a return hole in it's casting for excess lube to return internally. It's possible the return hole is restricted. On the other hand, if the machine has been filled with oil, it will probably leak like a siv.
The new lube should be 35 OZ of mobil XPH 222,
Hobart part number is 103881-47 for 32OZ.
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