1. Proper thread tensions are important to obtain the optimum stitch appearance, proper knot
location and tensions within the fabrics being sewn.
*Indications of proper and improper thread tensions.
When the upper and lower thread tensions are correct, the threads are knotted in the fabric center as
in this illustration.
With excessive tension on the upper thread, the result will be looping on the top of the fabric as in this
illustration.
With excessive tension of the lower thread, the result will be looping on the bottom of the fabric as in
this illustration.
2. Upper thread adjustments.
Rotation of the Tension control clockwise will INCREASE THREAD TENSION. Conversely,
COUNTER CLOCK WISE will decrease thread tension.
NOTE:
Make small adjustments (single number movements) until desired results are achieved. It is also
appropriate at this point to note that whenever you re-thread the machine, to make sure the thread is
properly seated between the tension discs. Lack of upper tension can result in looping of upper thread on
bottom of carpet.
3. Lower thread adjustments.
Remove bobbin case. Check that the bobbin spool is properly threaded in the case. To test tension,
hold the thread end and allow the bobbin case to hang freely. Give the thread a slight tug upward. If
the tension is correct, the weight of the case will cause approximately 1" of thread to feed out.
To increase tension, turn the small slot screw on the case clockwise. Conversely, counter clock wise
will decrease.
NOTE:
Rotate the adjusting screw no more than 1/8" to 1/4" turn at a single time, until desired result are
achieved. Recheck spool threading after each test and before reinstalling case in machine. Over time,
thread dust will accumulate between the spring and case and can cause erratic tensions. To correct,
remove screw and spring and clean.
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THREAD TENSION
