2022-Ultrafeed LSZ Guidebook - Flipbook - Page 43
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
58
Burred Area
A
B
> Gib Hook
Scan to watch a video
on how to maintain and
replace the retaining ring
cap spring and gib hook.
Ultrafeed® LSZ Guidebook
> Retaining Ring Cap Spring
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