Question about Brother Lay-In Thread Serger Mechanical Sewing Machine

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Upper and lower parts hitting

The upper and lower loop parts are hitting inside the machine, causeing it not to sew

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  • maudymc842 Sep 01, 2008

    I have the same problem with my Brother 934D, trying to correct the problem. Some of it is operator error, as I am getting better results everytime I rethread the machine. The main problem seems to be the lower looper. The thread jams inside the machine and then breaks. The other three threads are not breaking at this point. The machine sounds very noisy, and I can hear the needles hitting inside. I am about to give up and take it to the shop, which for me is 300 miles round trip.

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  • 13 Answers

It sounds like the timing of the loopers is out they will need to be reset correctly within millimeters. If not done properly they can hit and bend or break easily and most are not cheap parts. Best it goes to a repair centre as it will work out more cost effective than the damaged caused by getting it wrong.

Posted on Jun 23, 2008

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I have a 9020 singer sewing machine I bought without a manual. I can't seem to sew without looping the thread under it. Almost in knots.


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Machine is jammed, it seems that the upper loop and lower loop are colliding and it seems to be jammed and not able to sew or run properly! have any idea how i can fix it? I tried adjusting the lower loop...


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My Janome My Lock 644D will not sew. The upper looper hits the lower looper and the machine freezes. Any ideas of how to fix it?


No I am having the same problem and sorry but your all wrong
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#14 needle is way big for cotton napkin scrap. a #10 is good for most lightweight fabric. #14 is for sewing denim or levis, like that.

the tension problems on almost all machines regardless of price usually fall on the upper tension. the lower bobbin tension is factory set and it's rare you should ever need to mess with it.

if you have a drop in bobbin (top loading), tighten the adjustment screw all the way and then back it off 1/4 turn. if your machine uses a shuttle bobbin, tighten the adjustment screw all the way and then back it off in 1/4-turn increments until you can hold it in the air like a yo-yo and cause to bobbin case to fall slightly dipping your hand.

A dull needle and stitch length will also mess up your stitch. The idea is to narrow the problem down to one thing and one thing only -- UPPER THREAD TENSION.

So, if you have the right size needle for the job, with the right thread, and if your stitch length selection is correct (usually between 2 and 3 or 8-to-10 stitches per inch, the problem should be with your upper thread tension.

An easy way to fix this then is to remember: Loops on top, upper tension drop. Loops below, upper tension grow. If you get loops on top of your work, lower (drop) your upper thread tension to a lower number. If you get loops on the bottom, raise the upper thread tension.

Different stitches on the same machine will require different upper thread tension settings. Don't be afraid of it. Just remember the pneumonic: loops on top, tension drop, loops below, tension grow -- referring to upper thread tension.

have fun :)

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