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Adjusting Needle Bar Height on Singer Heavy Duty 4452?

I sew leather pretty often on my Singer heavy duty machine, so the timing goes out of wack constantly. Usually I'm able to fix the timing of the needle to the hook, but this time the needle doesn't seem to go low enough to catch the thread so I attempted to try adjusting it myself, but there are no marking to set the height and there is nothing about it in the manual. I have tried setting the needle up and down, but the closest I got was when I try to sew the stitches are fine on top of the fabric, but on the bottom there's a thread looping mess.

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Please help!

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Gold Post Medal for All Time! 677 Posts
September 6, 20190 found this helpful

www.singer.com/support

I would contact Singer directly above

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Bronze Post Medal for All Time! 140 Posts
September 6, 20190 found this helpful

It seems the leather is too thick for this needle on this machine!

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Bronze Feedback Medal for All Time! 196 Feedbacks
September 8, 20190 found this helpful

This machine is designed for leather, so I am surprised you are having issues.

There are a number of troubleshooting videos on YouTube, maybe one will help

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www.youtube.com/results?search_query=Singer+Heavy...

Has the machine been serviced recently? Perhaps it just needs a good professional service/cleaning.

Post back what you learn!

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Gold Feedback Medal for All Time! 949 Feedbacks
September 9, 20190 found this helpful

Since you have been having 'small' problems before, I believe you could use some help from people who really know sewing machines.
I know from past experience that Singer will not help with this kind of problem; if they cannot direct you to a 'service bulletin/video they will give you the address of a service agent near you.

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Here is a web site that is all about helping people with sewing machine problems - especially Singers - and they appear to love helping - even simple things so please contact them and ask your question.
I know that you will never regret joining this message board.
Joining for questions and answers (forum) is free and these members even contact people if they feel it may be necessary to explain a problem 'in person' - but only if you agree to accept calls/emails.
They do not do appraisals and they do not try to sell you anything but they do have members (all over the world) that have antique and vintage sewing machine parts.

ismacs.net/digest.html

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November 12, 20190 found this helpful

As was mentioned in the previous post, it is very strange that this model for leather has such a problem. Yes, its better to write to the Singer support but I think they can answer we cant solve this problem or something like this.

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Ive had the problem with my Singer 4423 sewingland.org/.../#product6 with needle and this video www.youtube.com/watch?v=UiNC3CbR52k helped me to solve it. Perhaps it can be useful.

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December 13, 20190 found this helpful

I just had the same issue as you did and in trying to diagnose the issue found this question you posted. Since I found a solution I figured I'd come back and let you know. If you go to the following page, it's page 16 of the machine's service manual, it shows how to pretty easily, adjust the height of the needle bar. Screw driver and allen keys, and something tiny you can measure 28.5mm with are essentially all that's needed. www.manualslib.com/.../Singer-4423.html?page=16#manual

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Hope that helps. Worked for me.

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