Jholden0 Report post Posted October 19, 2022 I recently purchased a yamata fy810 post bed which is a clone of the original singer 51w. It Works very well except when sewing thicker leather, the handwheel spins but the needle is stuck down in the material even though I can freely advance the handwheel. I think it may be a loose gear on the upper main shaft but I wanted to see if this sounds correct before I take it apart. I originally thought the handwheel may be loosely installed, but upon investigation, I can see that the upper shaft does indeed spin while the needle bar does not move. Does anyone with more experience have any input or suggestions to check before I start taking it apart? Thank you in advance! Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted October 19, 2022 You're assumption was correct. Some gear has slipped on the top shaft. You are going to have to find that gear and tighten it back down. I would leave it loose until the needle is close to the correct position relative to the hook and feed dog. Then tighten it down and time the hook as required. Quote Share this post Link to post Share on other sites
Jholden0 Report post Posted October 20, 2022 I was expecting that if the gear was loose, and the handwheel was turned, that the timing would be off. However, that isnt the case. It's very odd. I'll take a video and post it. That may be a better way to communicate my issue. Quote Share this post Link to post Share on other sites
Jholden0 Report post Posted October 20, 2022 Here is a video clip. Like I said, this does not throw the machine out of timing. Yamata needle bar not moving. Quote Share this post Link to post Share on other sites
Jholden0 Report post Posted October 20, 2022 I apologize for wasting your time, but I just changed out the handwheel with one from another machine. I thought the shaft was moving previously, but it was not. The new handwheel works perfectly. I was trying not to take the machine apart, meaning the internal components. And I didn't have to. Your reply got me thinking and what do you know. It's fixed. Thank you again for taking the time to respond! Quote Share this post Link to post Share on other sites
Wizcrafts Report post Posted October 20, 2022 So, it was a loose balance wheel all along? Quote Share this post Link to post Share on other sites