Table 4-4.—Troubleshooting Chart-Continued
1. Stitching Problems—Continued
Trouble
Probable Cause
Remedy
FAILURE TO
Wrong variety needle
Change to correct length needle.
MAKE A
S T I T CH
Bent needle
Change.
Needle not all the way in the
Insert correctly.
needlebar
Safety clutch disengaged
Clear jam and reengage clutch.
S K I P P ED
Hook too far from needle
Move hook saddle.
S T I T C H ES
Hook out of time
Retime.
Needlebar improperly set
Reset.
Needle not all the way into bar
Insert correctly.
Needle incorrectly aligned
Insert correctly.
. .
Thread too large for needle eye
Select correct needle.
T H R E AD
Thread controller
Adjust spring tension and/or spring stop.
B R E A K A GE
Right twist thread
Change to left twist (Z).
Hook point piercing needle thread
Needle eye too small
Burr on needle point
Hook out of time (retarded)
Too much tension
Improper threading sequence
Thread unwinding incorrectly
Thread breaks when clearing work
Set hook to needle.
Select larger size.
Remove burr or replace needle.
Retime.
Adjust tension springs.
Rethread (check first).
Adjust stand and/or spool.
Adjust tension release. Thread take-up
lever not at highest point.
2. Feeding Problems
F E E D
Arm shaft not in time with sewing
Retime by take-up lever and timing plate
F A I L U RE
hook driving shaft
(timing collar spline screw m u s t be in
spline).
Feed lifting cam fork inverted
Install properly.
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