TM 10-3530-207-14
Table 3-1.
Operator Troubleshooting - continued .
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CLOTHING SEWING MACHINE
12.
SEAMS DRAW.
Step 1. Needle thread or bobbin thread tensiontoo tight.
Adjust needle thread and bobbin thread to correct tension (para. 2-11j).
Step 2. Stitches are too long for the fabric(s) being worked.
Vary stitch length by turning the feed regulator dial to correct this problem. (para.2-11h).
13.
THREAD SNARLS AT BEGINNING OF SEAM.
NOTE
Snarls at the start of a seam can usually be prevented by manually placing needle into fabric before lowering
presser 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.
a.
To release snarl, turn hand wheel back and forth a few times to loosen the caught material. Remove
the material and snarled thread and observe the note above before resuming work.
b.
Check that machine is threaded correctly. Rethread machine if necessary (para. 2-11c).
14.
THREAD SNARLS DURING STITCHING.
Step 1. Lint from the bobbin area may be caught in the stitching.
Clean bobbin area of lint.
Step 2. Bobbin thread may be running out.
Replace bobbin with one fully wound (paras. 2-11d through 2-11g).
Step 3. Needle thread or bobbin thread tensions may be incorrect.
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