Can you see the bearings well enough to read the numbers on them? Those part numbers look more like a manufacturer's number. If the bearings
are bad, you could just pull 'em and take them to a bearing supply house. It's likely they're something standard.
It's a clausing model no 4914. I came original with a cogged belt from the spindle to the jack shaft that is driven by a v-belt off the electric motor. Just thought someone who had a 4914 gear head lathe might see this if they had replaced the jack shaft bearings.
Seems as if everyone one this site is more interested in the variable speed drive newer model clausings that from what I've read have a lot of trouble with that hydraulic drive. I'll stay with my good old gear head drive. No problems..