Inner Rotary Hook Assy. (Lower Thread) Tension - Brother PE770 Service Manual

Adjustment
Standard bobbin case (green marking on the screw)
[Adjustment standard]
Inner rotary hook assy. (lower thread) tension is 0.20 to 0.23N (20 to 23g).
[Adjustment procedure]
1. Set the bobbin (the schappe spun thread #90) in the inner rotary hook assy..
2. Pull the thread by a tension gauge, and turn the spring adjusting screw, adjust the tension to 0.20 to 0.23N (20 to
23g).
XA9153001
Schappe spun thread #90

Inner rotary hook assy. (lower thread) tension

Tension gauge 30 (0.3N)
0.20 - 0.23N (20 - 23g)
Spring adjusting screw
(color: no color)
4 - 19