Bobbin Case Thread Tension - Singer Futura Quartet FQ-4 Service Manual

22. Bobbin case thread tension

Check
1. Insert a full bobbin into the bobbin case, use normal polyester thread.
2. The thread tension spring of the bobbin case shall give a resistance of 10-14 g when pulling the thread
slowly, using normal polyester thread.
Adjustment
1. Insert a full bobbin into the bobbin case, use normal polyester thread.
2. Pull the thread slowly and turn screw (A) until the correct thread tension is obtained.
NOTE! Remove any loose pieces of thread or fl uff from the thread ten sion discs before any adjustment is
done.
A
Singer Futura XL-400 , FQ-4 27