I was looking at your pictures and the manual and noticed that it looks like the feed dog buttons on the bed of the machine is set for FMQ or darning. For regular sewing I think you want the button on the right pushed down. The "Adjustment of Feed Dog" is on page 13 of the pdf,
Also, you will probably need to adjust the pressure regulator. To release the pressure you want to press on the outside. Once the inside pops up you will want to push it down a bit. This information is on page 14 of the pdf.
It also looks like you took the upper tension assembly off. I hope it was on properly to begin with and you took pictures and laid them out in the way you took it apart and off. Many of these are a tad different from one another. Also there should be a check spring which goes on in a specific way to work correctly.
Janey - Neat people never make the exciting discoveries I do.