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Mechanical Issues
Issue Action
Cannot tighten the thread mast The bobbin winder thread mast may have a little thread relief at the
top of the threads, causing the nut to spin and preventing it from
tightening the thread mast loop over the thread cone. Turn the nut
counterclockwise to ensure connects with the threads on the thread
mast, then tighten it to secure the mast over the thread cone.
Thread comes out of the bobbin
winder’s tension assembly
Ensure that the pigtail thread guide is rotated slightly to the left of the
tension assembly. This pulls the thread further into the tension disks so
it will not pop out of the discs during winding. If the thread is slippery
and continues to come out, try double-wrapping it around the tensions
discs. Note: Use this technique only if nothing else works.
Bobbin winder runs but the bobbin
doesn’t spin
Remove bobbin from bobbin post. Use a flat screw driver to gently pry
apart the two tines on the bobbin post to increase the gap between
them. Bobbins should press firmly on to the shaft. After this adjustment,
bobbins should spin properly and not slip while the bobbin post spins.
Bobbin fills inconsistently with thread Make sure the bobbin is fully pushed on to the bobbin post. If
necessary adjust the thread tracking adjustment knob (on the back
of the bobbin winder, directly opposite the tension assembly). Turn
it gradually clockwise (to move the tension assembly closer to the
bobbin-winder base) or counterclockwise (to move the tension
assembly away from the bobbin-winder base) until the bobbin winds
evenly.
NOTE: Although the thread tracking knob was set at the factory, it
can require adjustment if bobbins aren’t consistently pushed on to the
bobbin post.
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