DURKOPP ADLER 550-12-33 Operating Instructions Manual page 183

Troubleshooting
Operating Instructions 550-12-33/34 - 00.0 - 08/2017
Error Possible causes
Missing Needle thread and hook
stitches thread have not been
threaded correctly
Needle is blunt or bent
Needle is not inserted
correctly into the needle
bar
The needle thickness used
is unsuitable
The reel stand is
assembled incorrectly
Thread tensions are too
tight
Throat plate, hook or
spread have been
damaged by the needle
Loose stitches Thread tensions are not
adjusted to the sewing
material, the sewing
material thickness or the
thread used
Needle thread and hook
thread have not been
threaded correctly
Needle Needle thickness is
breakage unsuitable for the sewing
material or the thread
Remedial action
Check threading path
 p. 24 and  p. 27
Replace needle
 p. 22
Insert the needle correctly
into the needle bar
 p. 22
Use recommended needle
thickness
 p. 183
Check the assembly of the
reel stand
 p. 140
Check thread tensions
 p. 42
Have parts reworked by
qualified specialists
Check thread tensions
 p. 42
Check threading path
 p. 24 and  p. 27
Use recommended needle
thickness
 p. 183
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