Brother PE-300S, Service Manual

Page: 42 / 57

- 40 -
13. INNER ROTARY HOOK BRACKET POSITION
STANDARD
There should be 1.9-2.1mm overlap between inner rotary hook bracket spring and convex part of inner rotary
hook.
ADJUSTMENT
1.
Loosen screw on inner rotary hook bracket.
2. Adjust the overlap so that it is 1.9-2.1mm between inner rotary hook bracket spring and convex part of inner
rotary hook.
3. Tighten screw on inner rotary hook bracket.
14. INNER ROTARY HOOK TENSION
STANDARD
Inner rotary hook tension should be 0.1-0.12N(10-12g) when #60 spun polyester thread is slowly pulled with a
tension gauge.
ADJUSTMENT
1.
Set a bobbin would properly with #60 spun polyester thread into the inner rotary hook, and pull thread slowly
with tension gauge.
2. Use a screwdriver to turn spring adjustment screw to the left and right, and adjust thread tension.
* After making adjustments, be sure to lock adjustment screw using an oil based paint.
1.9-2.1mm
#60 spun polyester thread
10-12g
2
1
2
1 3