Lou, I worked my way through college repairing furnaces and A/C at Bethleham steel 45 years ago.
My sister and her husband are still in the business, so when I need a special part, I can call her and get parts drop shipped. As for caps, I have buckets full of the old oil filled PCB caps. What you have can be replaced with 2 caps a 40 and a 4 mic. So, it's possible in a pinch, you could have just replaced just the bad one and still use the other.
First, never use grease on a bearing. Either use a turbine oil or I use full synthetic 10w30. Grease will dry out. You could use white lub, it won't, but I would still use oil. I put my finger over the shaft hole and fill bearing with oil and let soak for a few seconds. Look to see if the moving part of the motor is rubbing agains the stator. If you see scratches on the moving part, you have a bad bushing.
I wouldn't have sanded bearing part of the shaft. Perhaps polished the bearing surface with lathe 1000 grit and sand the rust off the rest of the shaft with anything.
I have two places to buy small A/C's, Menards and lowes. Usually the 5k's are manual controls, larger are electronic. The electronic controls usually have a 2-3 minute time delay built in, which is worth it in my opinion.
As for brands, I look for the ones that I know. However, like your maytag and everything else, Very few are still made in USA. Years ago I liked working on the whirlpools.
Little window A/C's are so cheap, I wouldn't even buy a part to fix one, I would go to town and buy a new one. Save the old one for parts. So, I try to buy many of the same brand for future parts.
BYW, I have a 6k maytag. Tenant said it wasn't working, so I put her a different on in. When it 50-60 outside, the maytag will freeze up. On a 75 degree day, in the shop, it worked just fine. So I cleaned it up and put it on the bench for another day.
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