Operation
22 Operating Instructions 513/533 - 01.0 - 09/2023
3.6 Adjusting the hook thread tension
Fig. 6: Adjusting the hook thread tension
The required hook thread tension must be generated by the ten-
sioning spring (1). The bobbin case upper section (3) should slowly
fall under its own weight when held by the threaded hook thread.
Adjusting the tensioning spring
To adjust the tensioning spring:
1. Remove the bobbin case upper section (3) with the bobbin.
2. Adjust the tensioning spring (1) via the adjusting wheel (2)
until the correct tension is set.
3. Insert the bobbin case upper section (3).
CAUTION
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Only adjust the hook thread tension with the
machine switched off.
(1) - Tensioning spring
(2) - Adjusting wheel
(3) - Bobbin case upper section
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