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Are you trying to use a heavy thread like buttonhole twist through the needle like the yellow thread on store bought jeans? Most domestic machines will not cope with this heavy thread and it will be too large for the eye of the needle too.
If you are using regular weight 50 polyester thread and its breaking then it could be because the top tension is too tight. Just loosen off 1/2 a number on top tension dial and see if this helps.
If possible, buy a pack of jeans needles size 100 too, these are blue coated with teflon I think, and makes it easier to slip through denim which is a very dense fabric.
Hemming denim jeans is probably one of the toughest jobs for a domestic sewing machine so if you are trying to do this, its a good idea to take it slowly and use a "humpjumper" which helps to maneouvre over the thick side seams.
However, even with all the above, many machines won't sew more than one layer of heavy dense weave denim.
I turned up my husband's jeans using a size 100 needle. You can get easy thread needles that have a small gap in one side that you slide the thread through. There is a good way to turn up jeans and keep the original hem without having to cut them. Have a look at this site http://www.daciaray.com/?p=38
Try loosening the thread when you feed it through. Give it a little slack but not too much. Also, make sure you are using quality thread like Coats & Clark. Lower quality thread has a tendency to snap and break.
your needle needs to be replaced and make sure it is in correctly..if this does not work you will need to make sure your thread is not old. then adjust you bobbin tension...there are 2 tensions on machine top and bobbin
There is special thread for denim/jeans. It usually comes in shades of brown. It's a little heavier and might help with the breakage. You might also want to try a little less tension. I assume you already have a Schmetz denim needle?