Setting the needle thread tension
46 Service Instructions 878-M PREMIUM - 03.0 - 10/2019
12.3 Setting the thread lever mechanism
Proper setting
The thread lever mechanism shall be set based on the sewing category,
i.e. according to the needle used:
Fig. 35: Setting the thread lever mechanism
1. Insert the 3 mm Allen wrench into the holes (1).
2. Loosen the threaded pins.
3. Set the thread lever mechanism to the position (A) or (B).
4. Tighten the threaded pins.
12.4 Electronic needle thread tension
The electronic needle thread tension is calibrated in the factory and cannot
be changed. The needle thread tension is controlled by the set value of the
respective parameter.
If you have any inquiries about the electronic needle thread tension, please
consult Customer Service ( p. 117).
Needle number/Nm Position of the thread lever mechanism
70 – 80 A
90 – 200 B
(1) - Openings for threaded pins
(2) - Thread lever mechanism position A
(3) - Thread lever mechanism position B
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