Thread is shredding, balling or breaking
There are a number of causes for breaking thread� Start with step 1 and stop as soon as the
problem is resolved�
1�
Lower Presser Foot
Make sure the presser foot is lowered before starting to sew�
2�
Machine Threaded Correctly
Check that your thread is correctly threaded along the thread path (p� 15)�
3�
Thread Snagging
Make sure the thread is not snagging anywhere from the cone/spool to the needle�
58
Thread Issues
4�
Incorrectly Installed or Damaged Needle
Make sure your needle is installed correctly (p� 32)� Carefully inspect the needle for burrs, warping or damage to the
point that may be causing needle deflection and shredding the thread. Bent or damaged needles must be replaced.
5�
Incompatible Needle Size & Thread Weight
If the thread is too thick or thin for the needle it will not pass through the needle eye to form a loop and will instead
ball at the needle� Check the compatibility of the needle size and thread weight (p� 4)�
6�
Burred Gib Hook or Retaining Ring Cap Spring
A machine crash or needle strike to the shuttle gib hook (
A
) or retaining ring cap spring (
B
) may result in a burr or
damage which can cause the thread to snag�
Remove any burrs by polishing them with emery paper or a fine file. If badly damaged, replace with a new retaining
ring cap spring (#160311) and/or new shuttle gib hook (#960122)�
7�
Machine Has Gone Out of Timing
If the machine is out of timing, it may cause the gib hook point to cut or shred the thread� To reset the timing on your
machine, follow the steps outlined in “Ultrafeed Timing” (p� 45)�
Burred Area
Burred Area
> Retaining Ring Cap Spring
> Gib Hook
59
A
B
39 |
Sailrite�com
Ultrafeed
®
LSZ Guidebook
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