Lower Looper Position Adjustment - Brother SB3734T Service Manual

Adjustment
1. Loosen the screw (screw, bind M3x6) for the
lower looper.
Needle plate
Screw, bind M3x6
UL threader
2. Turn the pulley counterclockwise rotation, and
then the lower looper is the most left position.

Lower looper position adjustment

Lower looper
Movable needle
guard
UL lever
Pulley
UL lever
3 - 5
3. Set the gauge at the position of the figure, and then
move the UL lever
counterclockwise rotation, and then adjust the position
of the tip of the gauge and the tip of the lower looper.
Contact to
the end face
Needle
plate
Gauge
UL lever
4. Fasten the screw (screw, bind M3x6) for the
lower looper.
*Key point
• Check that the UL threader is the lowest
position.
UL threader
while turning the pulley
Needle
Gauge
Gauge
2.7 mm
Lower looper
Screw, bind M3x6