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Topic Title: Lower looper constantly unthreaded!
Topic Summary: 7034D problem
Created On: 04/12/2013 11:02 AM
Linear : Threading : Single : Branch
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 04/12/2013 11:02 AM
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niftythrifty

Posts: 2
Joined: 04/11/2013

I have a Magnolia 7034D serger, and I have been using it for a few years. There has been a recurring malfunction since day one: The last "eye" in the lower looper thread path pulls out/comes unthreaded all the time. It seems pretty random. I rethread, from right to left according to the manual, using Maxi-lock thread. I have had a complete tune-up (all tensions reset, etc), changed the needles, tried different fabrics...all to no avail. It just. keeps. coming. unthreaded. It ran nicely after the tune-up for a little while (a few thread changes), and started again. I am a serger novice, so user error is a definite possibility...I just wish I knew what it was!

Could the diagrams of threading in the manual possibly be incorrect? Because I've followed it a million times.

*the dealer where I purchased the machine is a million miles away, and not terribly helpful anyway, so that route isn't a good option.
 04/12/2013 12:01 PM
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devilcat

Posts: 2042
Joined: 10/23/2007

When you say you re-thread according to the diagrams, do you just re-thread the problem area? The manuals do not emphasize this, but you must un-thread everything - the loopers and needles and then re-thread starting with the loopers and then the needles. If you are already doing this, I am sure that one of the members who is more experienced with sergers will stip with a suggestion. Be sure to let us know what happens.

Jacquie

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Ladysmith BC,Janome 12000, Bernina Record, Bernina 1150MDA serger, bit of a Luddite, garments not crafts
 04/12/2013 12:15 PM
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jsm1144

Posts: 631
Joined: 10/27/2010

Devil cat is right-to expand, if you break a looper, the needle threads must be out of the throat plate (you can pull them out and not even actually unthread the needles but they must be clear). This is because if you take a single stitch those needle threads wrap around the looper and if the thread comes out of the eye (I actually suspect that it's not coming unthreaded but is breaking because it's trapped)and you rethread it-even if you totally unthread the looper but leave the needle threads in the looper area. You'll never get more than a stitch or two before it gets trapped.
 04/12/2013 04:14 PM
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niftythrifty

Posts: 2
Joined: 04/11/2013

Thanks for your replies. First I usually try rethreading from the tension discs on (not rethreading absolutely everything). I do pull the needle threads out of the throat plate, rethread the loopers, and pull all the threads straight back. Sometimes that works, sometimes not in which case I rethread the whole blasted thing, start to finish. I would be surprised if the looper thread is breaking, because there is never a sense of pulling/tugging. I will pay closer attention next time and let you know.
 04/13/2013 04:44 PM
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digimad

Posts: 4261
Joined: 08/30/2007

One of the things you must watch out for is the two looper threads don't cross each other. That will snap the lower looper thread as you start serging. This is the link to Janomes serger basics tutorial serger basics link take a close look at second graphic, it shows the 2 loopers, the lower looper thread must NEVER lay across the top of the upper looper as you thread it up. The reason you unthread the needles is so you can turn the wheel and open a gap between the 2 looper eyes. You thread the Lower looper first, pull the thread out and lay on the serger back plate. Then thread the upper looper, it's easier than the lower looper to thread. Pull that thread through and up and lay on the serger back plate. Then thread up the right needle pull it under the foot to the back, and finally the left needle/ take that thread to the left when you've threaded the needle, take it under the foot take all 4 threads and gather them so when the foot is lowered they all sit under the back of the foot, then chain off a couple of inches. As long as you keep the initial lower looper thread UNDER the upper looper shaft, it wont snap.

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digimad
 04/23/2013 09:48 AM
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blueartisan

Posts: 10
Joined: 04/08/2013

digimad is right, the machine needles should not stay static while re-threading, that is you must move them into the correct position for each thread to be guided through correctly. I've had my compulock 2 for about ten years and I very rarely actually have to re-thread, the machine is literally falling apart from heavy use (vibrations ruin the screws eventually) and i have to get it repaired soon (if it can) but it still stitches beautifully because I always have it threaded correctly. I also advise that when re-threading move all your tensions to zero, that will ensure the thread does snap into the tension plate. There are many steps along the way as to where threading is done incorrectly (and where you can't see it) and it may even be a case of your lower looper being threaded correctly but your upper isn't. In my experience it's always the lower that will snap or un-thread if threading isn't done correctly on any of the threads. I also know start totally from scratch if the lower goes, the time saved from leaving other threads partially threaded isn't worth it when the damn thing won't sew properly! Also please tell me when you change threads you're doing the tie on and pull through? If you're threaded correctly then you'll never need to actually re-thread again! Oh and also check your needles, they go blunt too and skipped stitches can cause a breakage as well! good luck!

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MC 10001
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