Table 3-1. Operator troubleshooting - continued
TEST OR INSPECTION
DARNING SEWING MACHINE
Even if you see nothing wrong with the needle, it may have accumulated lint or sizing from the
fabric. This can happen with certain synthetics and permanent press fabrics or in stitching
through adhesives. Clean the needle or change it if this problem is suspected.
Step 4. Needle bar is out of adjustment.
Notify next higher level of maintenance.
Needle thread or bobbin thread tension too tight.
Adjust needle thread and bobbin thread to correct tension (para. 2-12i).
THREAD SNARLS AT BEGINNING OF DARN.
Snarls at the start of a mend can usually be prevented by manually placing needle into fabric
before lowering pressure foot. Be sure you have both needle and bobbin threads under the
presser foot and drawn to the rear. Hold both thread ends for the first two sew stitches.
Thread and/or fabric are probably pulled down into the bobbin area.
To release snarl, turn handwheel back and forth a few timesto loosen the caught
material. Remove the material and snarled thread and observe the note above before
Check that machine is threaded correctly. Rethread machine if necessary (para. 2-