42
TENSION
IS POOR
HANDWHEEL
WON’T ROTATE
HARD TO
GUIDE
MACHINE
THREAD
BACKLASH
• If using short staple threads, inexpensive or industrial threads or
coated threads, lint and other material will build up under the
tension leaf spring and begin to lift the spring, reducing the spring’s
ability to compress against the thread. By inserting a needle under
the spring and clearing out the lint, the bobbin tension will return
fairly close to its preset tension.
• If the bobbin is wound too tight or too loose, this can lead to poor
and inconsistent tension. Make sure when the bobbin is wound
that the thread tension is not so tight that the wound bobbin thread
feels hard and causes the bobbin to bulge when it is wound. It
should also not be so loose that the thread is spongy, causing the
thread to tangle as it is wound.
• Turn off and unplug the machine
from the electrical outlet. Remove
the needle plate to improve visibility. Remove any visible loose
threads. Lubricate the hook, forcibly turn the handwheel clockwise
and if necessary counterclockwise several times, and then remove
the thread caught in the hook.
• Center the carriage wheels on top of the continuous track. Check
that the machine carriage has not “jumped” the track.
• Remove all thread or debris in wheels. Check that the tracks are free
of all lint, threads and dust from chalks (if applicable).
• Level table.
• The bobbin should sit in the bobbin case such that one side is very
minimally above the edge of the bobbin case and if you lightly press
down on the bobbin, it descends slightly into the case. To adjust the
backlash spring, place the bobbin in the case and hold it with the
bobbin facing up. Then use a tiny screw driver to adjust the screw
on the outside front shiny surface of the bobbin case (not the screw
inside the bobbin case. Turn the screw counterclockwise to raise the
backlash spring (and raise the bobbin) or turn it clockwise to lower
the backlash spring (and lower the bobbin). After making an ad-
justment, reinsert the bobbin into the machine, bring up the bobbin
thread, and test stitching. Make additional adjustments if necessary.
Problem Cause
Correction
“Fuzz” caught under
the tension spring in
the bobbin
Poorly wound bobbin
Thread is entangled
and caught in the
hook
Carriage wheels not
centered on track
Thread caught in
wheels
Table not level
Bobbin thread tangles
within the bobbin case,
tangles and winds onto
the hook spindle, and
occasionally forms
loops on the bottom of
the quilt.
Summary of Contents for Crown Jewel III BLCJ18-3
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