Needle Bar Height Adjustment - Brother SB3734T Service Manual

Adjustment
1. Turn the pulley counterclockwise rotation, and
then the needle bar is the highest position.
2. Loosen the screw (set screw, socket (CP) M4x8)
for the needle bar connecting stud.
Needle bar Set screw, socket (CP)
connecting stud M4x8
3. Set the gauge at the position of the figure, and
then adjust the height of the needle bar while
adjusting the needle (left) to the gauge.
Gauge
Feed dog

Needle bar height adjustment

Pulley
Needle bar
Needle (left)
11.6 mm
Needle plate
3 - 3
4. Fasten the screw (set screw, socket (CP) M4x8)
for the needle bar connecting stud.
Needle bar Set screw, socket (CP)
connecting stud M4x8
*Key point
• Check that the 2 needles fall down the center
of the groove of the needle plate.
Needle plate
Needle bar
Needle