DURKOPP ADLER 906 Operating Instructions Manual page 39

Operation
Figure 19: Setting hook thread tension
④
⑤
(4) - Tension spring
The hook thread tension is generated by the tension spring (4) and
adjusted via the adjustment screw (5).
To increase tension:
1. Turn the adjusting screw (5) clockwise.
To reduce tension:
1. Turn the adjustment screw (5) counterclockwise.
Order
1. Release the Safe Stop button (1).
 The cover plate (2) pivots back to the original position.
Operating instructions 906 - Version 00.0 - 05/2014
(5) - Adjusting screw
37