Adjusting the needle thread tension
Service Instructions 867 - 04.0 - 10/2019 63
4. Move the needle thread regulator (2)
• Reduce needle thread tension: slide to the left
• Increase needle thread tension: slide to the right
5. Tighten the screw (1).
13.2 Adjusting the thread tensioning spring
Fig. 48: Adjusting the thread tensioning spring
The thread tensioning spring holds the needle thread under tension from
the top dead center of the thread lever up to the point when the needle eye
plunges into the sewing material.
Proper setting
The thread tensioning spring does not contact the stop until the needle eye
has plunged into the sewing material.
The adjustment for the thread tensioning spring must be varied according
to the sewing material and the required sewing result.
To adjust the thread tensioning spring:
1. Loosen the screw (4).
2. Turn the stop collar (1) to set the spring travel.
• Longer spring travel: turn counterclockwise
• Shorter spring travel: turn clockwise
3. Turn the tension disk (3) to set the spring tension.
• Greater spring tension: turn counterclockwise
• Lower spring tension: turn clockwise
Important
Do not twist the stop collar in doing so.
4. Tighten the screw (4).
(1) - Stop collar
(2) - Spring
(3) - Tension disk
(4) - Screw
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