Duerkopp Adler 550-12-23 Service Instructions Manual page 7

2.2 Position of the Lower Timing Belt Pulley
The screws of the lower timing belt pulley should be in the position
shown when the machine is arrested in position F.
Caution Risk of Injury!
Before adjusting turn the main switch off.
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Arrest the machine in position F.
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With an incorrect position of the screws first set the position of the
upper timing belt pulley (Chapter 2.1).
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Remove the timing belt from the upper timing belt pulley.
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Turn the lower timing belt pulley until both screws take the position
shown.
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Place the timing belt again.
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Check all following settings or reset.
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