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Fig. 25: Adjusting the hook thread tension
(1) - Tension spring
The hook thread tension is generated by the tension spring (1) and adjust-
ed via the screw (2).
To adjust the hook thread tension:
1. Turn the screw (2).
4.3 Adjusting the needle thread regulator
The needle thread regulator (2) regulates the amount of needle thread re-
quired for forming the stitch.
An optimum sewing result is possible only when the needle thread regula-
tor is exactly adjusted.
With the correct setting the needle thread loop must slide over the thickest
part of the hook at low tension.
Proper setting
The loop of the needle thread slides at low tension over the thickest point
of the hook.
38
• Increase the hook thread tension: Turn screw (2) clockwise
• Reduce the hook thread tension: Turn screw (2) counterclockwise
WARNING
Risk of injury from needle tip and moving parts!
Puncture, cutting and crushing possible.
Switch off the machine before adjusting the needle
thread regulator.
①
②
(2) - Screw
Operating Instructions 550-D800 - 01.0 - 05/2023
Operation
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