Setting The Underthread Tension - Duerkopp Adler 743-221 Operating Instructions Manual

2.10 Setting the Underthread Tension

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The necessary underthread tension should be created by the tension
spring 1.
Caution Risk of Injury !
Turn the main switch off.
Set the brake spring 1 and the tension spring 3 only with the sewing
unit turned off.
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Place the bobbin in bobbin case top 1 and thread the underthread.
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Set the tension spring 1 at adjusting screw 2.
The underthread tension should be 20 - 30g.
The bobbin case 6 should slowly lower under its own weight (see
right illustration).
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