When teeth on a drill press adjusting rack break you can lose performance because the table won't adjust along its full range. This video outlines the steps necessary to replace the adjusting rack s...
Most of the time a hardware pack includes all the bolts, nuts, screws,washers and some small extra items for the machine in question.
The reason you cannot locate the spindle part number for your Delta 11-900 Drill Press is because the manufacture no longer supplies it. The old part number for the spindle was 1310040 if you want to search on line to see if anyone out there has one.
The capacitor is not offered as a separate part from the manufacture. I would remove the capacitor and take it to a local motor shop. A well equipped shop will have a selection of capacitors available and should be able to match one up for you.
I would try cleaning the chuck with a spray solvent like carb cleaner. Sometimes the rust inhibitor that is applied for shipping will clog the jaws of the chuck. The cleaner should remove it. After cleaning I would spray a lubricant like WD40 into the chuck as well. This will lubricate everything and prevent rust. If this doesn't work then likely the internal jaws, springs or retainers are damaged and the chuck will need to be replaced.
It's okay for occasional use and not too heavy duty, it outdoes a hand-held in accuracy for sure. Am having difficulty finding the K-26 vee belt in Canada. For under $100 it's a good buy. I won't give it top rating, only because of what it isn't.