Have a look on Grizzly tools in the US they do many of the same machines though named differently and have all their (better) manuals available to download.
Is it one of these lathes in this photo here ,have the user manual usual far east type of thing but has all of the information needed ,send pm with e mail and i can copy it if you need it.
I've just stared working as a DT technician at a school and we've got two Cub 630 lathes that I'd love to get back up and running so trying to replace the tools and everything as they've vanished since the machines were last used over a decade ago.
Any chance I could get a copy of the manual from someone?