Brother CB3-B917 Service Manual page 36

A
Screw flat
421s
422s
Mark
423s
0.3 mm backlash
Backlash becomes larger
Backlash becomes smaller
424s
6. Place end A of the stop cam side
and align the take-in of feed cams
cam positioning pin
of direction of rotation to the screw flat of the cam shaft
. The screw flat of the rotating hook shaft
face straight down at this time.
*Eliminate the backlash in the thrust direction of the cam
shaft by adjusting feed cams
*Align the center of the worm gear
the rotating shaft
7. Insert the clutch shaft
and the number of stitches control lever
eliminate the backlash of the clutch shaft
the number of stitches control lever
8. Move the sewing machine to the stop position.
The mark of the feed cam should align with the cam
positioning pin
the head of the clutch.
9. By loosening the worm
a screwdriver, adjust so that the backlash of the worm
and worm gear
CB3-B916A/B917A
4. REPLACEMENT OF PARTS
in a vertical position
and
. Tighten the stop screw at the side
and
with the center of
.
, fit the button clamp driving lever
by adjusting
.
when the stop cam side
, and turning the worm
becomes 0.3 mm at the feed cam
with the
should
.
, and
contacts
with
.
30