Hi There
If it is the one I think it is easy.
It is 35 years ago since I did some but here goes.
Don’t force anything in case I forget something.
Remove the handle spring. Be careful, it might bite.
Remove the drill stop nuts so the quill can drop down.
I think you may have to remove the quill lock if there is one.
Right, quill is out or should be.
Lower bearing is tapered upper possibly plain.
In the side of the quill there should be a small hole.
This enables you to put an allen key into a collar on the spindle.
Loosen the screw and the collar will be free.
You should be able to lightly tap the top of the spindle and it should come out.
I think both bearings may come off fairly easily but can’t remeber for sure.
At least you can grease them easily.
Reassembly
Put a chuck in the spindle.
Reinsert the spindle.
Put the collar on but do not tighten it up.
Get a bit of tube and put it over the splined spindle pressing the collar tight.
Tighten the collar.
Job done, reassemble the remainder.
These were old round top models but I don’t expect the design changed much over the years.
Press the chuck against the bench or similar while pressing the tube against the collar.
Let me know how you get on.
If you can take photos you could write it up for MEW.
I expect there are many of these machines out there.
regards david