I need a Thread diagram for a DU4410L Kingstar Industrial sewing machine

SOURCE: Brother Industrial Machine Tension

This is an answer to another person with a similar complaint. Try the suggestion below, it may fix the problem.

From your description it appears that you have tried tension settings on the upper tension control adjustment knob without success.
Check that the bobin tension is adjusted correctly by taking out the bobin complete with the spool.
Pull the cotton thread and it should be a smooth light pressure if the tension is correct. If it is tight to pull or pulls freely then adjust the tension screw which is found on the outside of the bobbin. The screw is very small and requires a minature size screwdriver. The adjustment will only be a slight turn of the screw one way or the other to obtain the correct tension(depending if it was loose or tight).
Once this is set reinstall the bobin and tread up the machine, hopefully with the upper tension set at approx."2" the machine will sew correctly.

SOURCE: Brother DB2-B755-3 industrial sewing machine

I have the manual in pdf form here

http://myweb.tiscali.co.uk/stitches/BROTHER-DB2-B755-MKIII-MANUAL.pdf

SOURCE: How do I thread this machine?

Manual here.

http://myweb.tiscali.co.uk/stitches/BROTHER-DB2-B755-MKIII-MANUAL.pdf

SOURCE: Bobbin won't thread on my Broter DB2 B755-3

Manual here........


http://myweb.tiscali.co.uk/stitches/BROTHER-DB2-B755-MKIII-MANUAL.pdf

SOURCE: How do I fix skipped stitches?

i work on this kind of machine all the time.but i have never set one up for this type of material.if i was having this kind of trouble on a machine i would make sure the tension for the thread is not to tight because this can cause it to skip.if the material is real heavy it will push the needle away from the bobbin hook causing it to skip .is the needle depth set right.tilt the machine up and watch the bobbin as you spin the machine by hand.the needle should just start to come up then the hook on the bobbin should grab the thread.the hook on the bobbin should be as close as you can get it to the needle with out touching the needle.try putting some of the material on the machine while you run it by hand and watch needle and bobbin.if you need to adjust the machine their are two bolts on the bobbin block.if you loosen the screws you can move the bobbin closer to the needle. also their is a screw on the needle bar to adjust the needle depth up or down, i hope this will help you out.