Duerkopp Adler 579 Service Instructions Manual page 85

The sewing mechanism can only
be moved with difficulty with the
machine turned off.
The set collars on the looper
turret drive or on the needle bar
drive are set too tight against
the drive lever or the crosshead
Possible sluggishness of
individual components
Check the set collars on the looper
turret drive or on the needle bar
drive and set a little play, if
necessary (See Chapter "Setting
the Looping Stroke", "Needle Bar
Height", "Spreader Plate"
Check all components involved in
the sewing mechanism rotation.
If no faulty components or stiffness
was found, it is possible, in some
cases, to remedy the problem by
changing one of the following
parameters
- Reducing the speed
- Increasing the stitches in the eye
- Decreasing the stitch length
- Decreasing the overlap
- Increasing the stitches in the
round bartack
- Decreasing the stitch length
in the crossbar
- Decreasing the covering stitch width
in the cross tack
(see Operating Instructions "Changing
Buttonhole Programs"):
If necessary, notify service personnel
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