(There is also an excellent writeup by Zincboy on this forum also).
To verify the oiling system, remove the way covers, and carefully clean the exposed ballscrews of any dirty residue. Clean the exposed dovetail ways and add oil to all surfaces. It is also a good idea to take off (at least) the X-table and clean and oil the dovetails and the tapered gib. Make SURE that the gib is re-inserted with the shinier side toward the column, and the narrower tapered end placed toward the right end of the X-table. It is possible to re-install the gib with the wrong side facing the column, and then the machine is subject to jamming of the x-table, wedging it immobile!
Operate the one shot luber a few times and see where the oil appears.