Setting the needle thread tension
44 Service Instructions 878-M PREMIUM - 03.0 - 10/2019
12 Setting the needle thread tension
12.1 Setting the needle thread regulator
The needle thread regulator determines the tension applied to guide the
needle thread around the hook. The required tension depends on the
thickness of the sewing material, thread strength and stitch length.
• Lower needle thread tension: thin sewing material, low thread
strengths
• Higher needle thread tension: thick sewing material, high thread
strengths
Proper setting
For a majority of sewing operations, the optimal setting of the needle thread
regulator is with its bottom edge facing the number 2.
The loop of the needle thread slides at low tension over the thickest
point of the hook, without forming loops or snagging.
1. Open the hook cover.
Fig. 33: Setting the needle thread regulator
2. Turn the handwheel and observe the cycle of the needle thread around
the hook.
3. Loosen the screw (1).
CAUTION
Risk of injury from sharp or moving parts!
Punctures and crushing possible.
Switch off the machine before setting the needle
thread tension.
(1) - Screw (2) - Needle thread regulator
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