I'm not familiar with this machine but it sounds as though your top tension is too tight so that when you sew through heavy material the thread isnt slack enough to go through that extra thickness and so simply snaps. Try reducing the tension a little at a time and see how your stitching is affected.
Another issue might be that you are trying to sew a heavy fabric and using too light a thread. You need to match your thread to the job in hand. For a thicker thread you need heavier top tension. If your machine has been correctly serviced you should not have to alter the bobbin tension at all under normal circumstances as thicker thread will automatically have a heavier tension as it goes under the bobbin case spring and so you have to match this heavier tension with a higher top tension in order to get a perfect lockstitch.
I hope this helps.
SOURCE: Juki DDL 8300
You need to do a tension test.
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Tension assembly test. To do this test. Pull the thread
through the tension assembly and test it to make sure the tension is working
correctly.
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.)
If it doesn't do this you ned to rethread it through the tension discs and make sure the thread is between the discs.
sewman7
SOURCE: Hello, I have a juki DDL 5550, runs great, But the
Soulds like your not geting the top thread all the way in the tension disk. Make sure you have the presser foot up when you thread the machine. also after you get it treaded check to make sure you have tension, with the presser foot up you should have not tension and with it down it should be very hard to pull.
hope this helps
SOURCE: I have a Juki DDL 227. Top thread keeps breaking instantly
Well, you've not checked "Everything" but you have checked the common things.
Do you have any idea of where it is actually breaking? Re-thread your machine and see if you can determine exactly where the break occurs.
Sometimes a damaged needle throat plate will break threads... as will a burr on the hook in the bobbin area. Also if there is a burr or rough spot on the thread spool it will sometimes catch and cause breakage.
Good luck
try changing the needle to one that will work with heavier thread
you may have to change the bobbin to heavier thread also
try adjusting the tension also
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