removing the table is easy. Id suggest removing the chuck to clean underneath, Rusty most likely.
Move the table fully to the right, look under the table, there is a eye bolt, remove the nut, disconnect the cable, now look under the left side and note how the cable is wound on the spool, the disconnect the cable from it post, They lift the table off, it weights about 80# IIRC.
Check the oil feed line for leaks or kinks, as the table has to be off to tighten the tube nut.
Move the saddle to access the two bolts that hold the nut to the base. There is a wick oiler with spring center under the nut, a PITA to reassemble, The nut is iron and not cheap. I bought a piece of acme threaded rod, an a matching nut, bored out the Harig nut and installed the Bronze nut into that. The old worn setup had .060" backlash, now .005. Check the double BB on the shaft for rough, slop rust, they are cheap.
When assembling the shaft and nut, they must be assembled together, then install the wick, spring, and bolt to the base.