Dial Tension; Upper Thread Tension - Baby Lock BL7800 Service Manual

12.

DIAL TENSION

STANDAD
With the presser foot lowered and the thread tension dial set to "4", use polyester thread (#60) to check that the
tension between the tension discs is 33 to 38 g.
ADJUSTMENT
1. Set the thread tension dial to "4", pass polyester thread (#60) between the tension discs, then lower the
presser foot.
2. Loosen the adjusting screw on the thread tension regulating nut.
3. Pull the thread with the tension gauge and turn the thread tension control screw to adjust the tension until it is
between 33 and 38 g.
4. Tighten the adjusting screw on the thread tension regulating nut.
1
13.

UPPER THREAD TENSION

STANDARD
With the presser foot lowered and the thread tension dial set to "4", use polyester thread (#60) to check that the
total tension of the tension plate and the tension discs is 44 to 54 g.
ADJUSTMENT
1. After adjusting the dial tension, pass polyester thread (#60) between the tension plate and the tension discs,
then lower the presser foot.
2. Pull the thread with the tension gauge and turn the thread tension control screw to adjust the tension until it is
between 44 and 54 g.
1
1
3
2
4
tension plate
1
-31-
polyester
thread (#60)
33- 38g)
polyester thread (#60)
44-45g
tension discs