Adler 167-gk373 problems...

[DonInReno]

You’re getting a lot of practice with these things!

I thought those socket headed cap screws looked out of place - I wonder if the  original screws were buggered up and someone retapped the holes?   Normal bolts, even high strength bolts, aren’t nearly as hard on the tips as set screws, especially sewing machine set screws.

Maybe you said this already and I’m missing it, but have you checked the set screw that holds the hook on its shaft to make sure it’s in its groove?

Often, the various set screws all set in grooves or flats except in one spot that’s for the designated hook adjustment.  I haven’t looked at a manual for this machine, but it is good to know that you aren’t trying to set hook timing in the wrong set of screws.   It’s odd if there is a flat on the hook adjustment screws - defeats the purpose of adjustability.

I only linked this video because it shows the lower guts.

 

[Wyowally]

Don, thanks!  I also thought the socket head screws seemed out of place. I might pull one and check the thread pitch and type just for curiosity. I try to get all the original adjustment info I can, but still rely heavily on you, Uwe, Constabulary and others. I had my upholstery buddy come over and test run this one with various materials, speeds, forward/reverse shifts and all. He gave it his seal of approval. It is fun to watch a pro!

[DonInReno]

That awesome news - should be a solid machine!