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Jholden0

Yamata fy810 post bed slipping thicker material

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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!

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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.

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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.

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Here is a video clip.   Like I said, this does not throw the machine out of timing.  Yamata needle bar not moving.

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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!

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So, it was a loose balance wheel all along?

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