Duerkopp Adler 609 Instruction Manual page 20

16
Checking the positioning:
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Turn on the main switch.
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Briefly push the pedal forward.
The sewing machine positions in thread lever upper dead center.
–
Push the pedal completely backwards and keep it pushed. The
thread is trimmed.
The sewing machine positions in thread lever upper dead center, if
the needle return function is deactivated.
–
With the needle return function activated, the sewing machine
positions about 45 degrees before thread lever upper dead center.
–
Check, whether the thread lever reaches the position 2 mm after its
upper dead center after each stitch (without thread trimming). To
this end turn the hand wheel slightly to and fro.
In general the checking then is completed.