This video covers:
Disassembly Brother 1634d
Adjust timing
Reassemble
Put this video together to remember how to align the upper looper, lower looper and needles of Brother 1634d. I found a webpage that had some fairly detailed instructions. These instructions helped me but a little more adjustments needed to be made to get the alignment just right. Thus the need for this video.
I will post the link to the website unless otherwise told to remove it. The instructions and pictures there were very helpful.
Original post that helped me. I am not associated with this website or blogger.
https://seamsimportant.blogspot.com/2016/02/timing-is-everything.html