Pulling well pump

Cool! I figured it would not be too bad to pull. I never heard of the pump unscrewing from the pipe, but anything is possible.

That certainly seemed to be what happened. I had 3 guys here watching me today and they all looked at the pump and the pipe. The threads were OK and the pump certainly came loose.

I thought about just screwing it back on and shoving it back down the hole

In the end I decided a 12 year old pump was not worth putting back down the hole and one of the guys had an account at a landscape supply so I got a new Myers for $230. I went back with all new stuff. I did drill and tap a SS screw in the pump to pipe threads. It ain't unscrewing again ;-)

from vibration? for us, it's 630 feet down.

I suppose it just vibrated loose. The SS screw is a good idea. I'd keep that old pump in case you ever breakdown on a weekend. When my pump died, it was over 30 years old.