DURKOPP ADLER 911-210-3020-10, Operating Instructions Manual

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Troubleshooting
120 Operating Instructions 911-210-10 - 00.0 - 06/2020
10.3 Errors in sewing process
Error Possible causes Remedial action
Unthreading at seam
beginning Needle thread tension is
too firm Check needle thread tension
Thread breaking Needle thread and hook
thread have not been
threaded correctly Check threading path
Needle is bent or sharp-
edged Replace needle
Needle is not inserted
correctly into the needle
bar Insert the needle correctly into
the needle bar
The thread used is
unsuitable Use recommended thread
Thread tensions are too
tight for the thread used Check thread tensions
Thread-guiding parts, such
as thread tube, thread
guide or thread take-up
disk, are sharp-edged Check threading path
Throat plate, hook or
spread have been
damaged by the needle Have parts reworked by qualified
specialists
Skip stitches Needle thread and hook
thread have not been
threaded correctly Check threading path
Needle is blunt or bent Replace needle
Needle is not inserted
correctly into the needle
bar Insert the needle correctly into
the needle bar
The needle thickness used
is unsuitable Use recommended needle
thickness
The reel stand is
assembled incorrectly Check the assembly of the reel
stand
Thread tensions are too
tight Check thread tensions
Throat plate, hook or
spread have been
damaged by the needle Have parts reworked by qualified
specialists