NowhereMan01

I actually removed the set screws that hold the spring in place, and it was a bit of a pain to get that put back together (had to compress the spring with wires). But, I don't think that has anything to do with the issue. The "eccentric" piece slides freely in either direction, so I can slide it back into place. But, when the rod turns (for example, when I turn the wheel by hand), the rod does not "grab" (or engage?) the "feed eccentric" piece at all, so it is not even possible to rotate it into position for the stitch-length button to be pressed.

It looks like I spoke too soon. It did seem to "walk", so I tried adjusting the stitch length (still without thread, just trying to get a bigger "step"), and when turning the wheel with the button pressed, it seemed to have no resistance, and the results were very flaky. Sometimes it would walk more-or-less as expected, sometimes almost not at all, and sometimes it would even go in reverse (without the reverse lever pressed). So I started looking at the "Feed eccentric adjustment" on p. 24 of the manual, and that thing in the 2nd picture slid out of place, and doesn't seem to be attached to anything. Is it supposed to be like that?

I think this solved the problem! Many, many thanks. I believe that what happened is that when it jammed (and I accidentally hit full throttle) the belt slipped. Now that I have aligned the "lower pulley" with "setting mark A" (as per page 26), it seems to be walking again. We have a heat wave here, and I don't feel like thoroughly testing it at the moment, but once I get around to it (which might take a week or so), I'll post here again, just to confirm...

Thanks for the quick response. I'm not sure what you mean by raising the middle foot "by hand", but everything seems very rigid, unless I turn the wheel. Yes, I do have the manual, which can be found here: https://s3.amazonaws.com/a.teamworksales.com/SINGER+SERVICE+MANUALS/211U157A_165A_166A_566A.pdf The only thing I've found in it that looks at all relevant is on p. 25, "ADJUSTMENT OF THE LIFTING ECCENTRIC AND THE LIFT OF THE ALTERNATING PRESSER FEET". If there is anything else in it that I should be looking at, LMK.

I have a Singer 211U166A that I got for free, including table, servo motor, bobbins, and needles. I'm completely new to sewing, and the machine was not working when I got it. Fortunately, a local repair guy got it going, and I was able to sew several things with it--not leather, but some very thick, heavy, multiple layers of cloth (mostly, sailing-related). Yesterday, the bobbin got jammed, and my foot slipped, no doubt putting a lot of pressure on the drive, which resulted in a clunking noise, and a screw that connects to the reverse lever even fell off. I was able to replace the screw, but now the walking foot seems to not be walking. Specifically, the middle part of the walking foot stays pressed down on the fabric the entire cycle, and hence the cloth does not feed. I have posted a short video here: Any suggestions would be greatly appreciated!