Question about Simplicity SL370 Mechanical Sewing Machine

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First time user simplicity sl 370

Fisrst time try to use a simplicity sl 370 serger.The loop is not forming.Any sugestions?

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  • MARVALYN Jan 05, 2008




4 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

  • 202 Answers

SOURCE: problems threading a Europro serger

Probably the needle hit one of the loopers and left a burr on it that is catching the thread. Run your finger nail acroos the edges of the loopers. If you find a burr it can be polished off using very, very fine crocus paper from a hardware store.
Or the needle hit a the upper looper and knocked it slightly out of position.
After you have it threaded (correctly) turn it slow by hand and watch the loopers very closely. You will probably see what is happening.

Posted on Dec 12, 2008

  • 1116 Answers

SOURCE: just got a used simplicity serger how to use and

Sergers are used to finish raw edges.

Not the best choice for quilting and purse making.

Posted on Apr 06, 2010

Tally Girl
  • 1133 Answers

SOURCE: I need a manual for a Simplicity Easy Lock Serger

You can purchase a manual for this machine from the following link for $US14.99

I can't see it anywhere for free download unfortunately. But you may find that looking at a manual for another 4 thread overlocker may get you started. If you try this link you can look at the free Singer downloads,
try this link for their 654 3/4 thread model
it may give you some help now.

Essentially, to change the stitch width you can either move the lower fixed blade wider to cut less fabric or tighten up the upper and lower looper threads in order to close up the stitching.

Moving the blade usually means opening up the front cover door, putting pressure on the upper blade and swinging it up out of the way. Then you can adjust the lower blade, usally by turning a knob near to it. Sometimes this knob will be marked 1, 2, 3.

Adjusting the looper tensions is done by changing the tension dial settings for the thread needing adjusting. If its a standard four thread overlocker that produces a "marrow" seam it will have two needles and two loopers, upper and lower. Generally on most overlockers, the upper looper will be the second from right tension dial and lower looper will be right most tension dial - turn up one half number to tighten, or down one half number increment to loosen, then test stitch again. The needles shouldn't need adjusting too often.

I usually start with all tension dials on 5, test stitch, then adjust from there. Some fabrics will tunnel (pull in) if the seam is too wide so you need to either move the blade to the left and trim more fabric or loosen off the loopers. Or in the reverse, like you are getting, the threads will hang off the edge.

There is some good serger information on Debbis Cosgrove's pages but if you have never used a serger, then getting the genuine manual is probably best.

Posted on Oct 17, 2011

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I have a easy lock serger Model SL4300 and I need to know the needle size and what brand should I get, lost my manuel


Free Manual For Simplicity Easylock Serger Model Sl4300


This site shows Organ and Schmetz needles but most quality needle brands would be suitable for your machine. A standard 130/705H needle will work. Just be careful as I believe my machine recommends no needles larger than a size 90.
SL4300 Overlock Serger


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