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What are the part numbers for the upper and lower knife blades of a Simplicity serger, Model SL390?

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  • Simplicity Master
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  • Diane Bryant
    Diane Bryant Apr 25, 2015

    Thank you. I am glad to know the 370 is the same.

  •  johnny rebel
    johnny rebel Apr 26, 2015

    your welcome

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I need simplicity serger sl390 instruction.


This manual isn't available for free online. However, you can purchase a copy from a couple of vendors for ~$15. Look at http://www.sew4less.com/product/1233/Simplicity_SL370_and_SL390_Instruction_Manual or http://www.sewingpartsonline.com/instruction-manual-simplicity-sl390.aspx . Note: the SL370 and SL390 share a manual.

I hope this helps.

Cindy Wells

Apr 16, 2017 | Simplicity Sewing Machines

1 Answer

Why does lower knife hit the upper knife?


the serger needs to be checked to see if it needs a adjustment or if there is a timing problem

Mar 14, 2016 | Brother 1034D Serger Sewing Machine

2 Answers

I need a manual for a Simplicity Easy Lock Serger SL4300. I got it from a friend and she didn't have the manual. The loops are over the top of the material sticking out to far and I do not know how...


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

http://www.sewingpartsonline.com/instruction-manual-simplicity-sl4300.aspx

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 http://www.singerco.com/accessories/instruction-manuals you can look at the free Singer downloads,
try this link for their 654 3/4 thread model http://www.singerco.com/uploads/download/555_14sh644_654-(e_s_f)-(new-led-version).pdf
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 www.sewing.about.com but if you have never used a serger, then getting the genuine manual is probably best.

Oct 16, 2011 | Simplicity Serge Pro SW432 Mechanical...

1 Answer

I HAVE MISLAID MY INSTRUCTION MANUAL FOR MY SERGER MY LOCK 634D CAN YOU SUPPLY NEW ONE


I found on eBay the instruction you need. It is the item number 160421822703

Feb 25, 2009 | Simplicity Frontier SL390 Mechanical...

1 Answer

I need a manual for my serger


What kind'a of serger do you have. What bran

Jan 25, 2009 | Simplicity Frontier SL390 Mechanical...

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