Question about Janome MyLock 644D

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I need to know the proper tension of a Janome 334d Mylock.

Hello I have re thread my 334d that my mother got from a friend. The temsion seems to be all out of whack, what is the correct tension? Thank you. PS I dont have the handbook.

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Check there is no thread caught in the tension units and set them ALL to 3 for the Factory setting......try a sample.....if it looks good, OK, if not, try to balance it by gently altering the knobs on the right (loopers) until they form an even tension in balance with each side of the fabric.

Posted on May 31, 2009


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Owners manuaal for a mylock 334D?

Email Janome "Customer Relations" for a copy of the manual. If you only need the threading diagram: or the whole thing is here: (among other sources).

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Your thread tension wheel may be set to too high of a tension, which will cause the thread to pull out from the bobbin. Try a lower tension setting.

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The needle thread breaks
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2. The needle thread tension is to tight
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Does this have 'auto threader' for lower looper?'

look on you tube there is a good tutorial there for a janome overlocker

Jun 10, 2010 | Janome MyLock 634D Mechanical Sewing...

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I need to check the tension on my Janome 534D, I think the upper and lower looper tensions are not right

Here's a couple of solutions to try.

* Re-thread your machine
It may be threaded incorrectly. And when you re-thread it, make sure your thread goes in between your tension disks. (If you don’t know where your tension disks are, consult your machine’s manual.)

* Check your tension disks for dirt or lint
Lint or dirt between your tension disks may be keeping your tension from working properly. Clean out any you find.

I hope this helps.

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This LINK is for the 334D and is essentially the same.......there should also be a small threading diagram inside the door at the front

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Make sure the thread is in the tension disks. Do this by pulling the thread backwards towards the spools. Also set the tension on zero and check for any fluff, or thread that is stuck in the disks, preventing them from closing properly. Good luck

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