Front / Back Position Of Lower Looper Adjustment - Brother SB3734T Service Manual

Adjustment
1. Turn the pulley counterclockwise rotation, and
then set the needle and the lower looper at the
position of the figure.
Needle
UL threader

Front / back position of lower looper adjustment

Pulley
Lelt needle
Lower
looper
Contact to
the end face
Lower looper
Movable
needle guard
UL lever
UL lever shaft assy
3 - 7
2. Loosen the screw (set screw, socket (CP) M4x4)
for the UL lever shaft assy.
Set screw, socket (CP) M4x4
3. Move the UL lever shaft assy, and then adjust
the gap of the needle (left) and lower looper to 0
to 0.05 mm.
Left needle
Lower looper
Movable needle guard
4. Fasten the screw (set screw, socket (CP) M4x4)
for the UL lever shaft assy.
Set screw, socket (CP) M4x4
UL lever shaft assy
0 to 0.05 mm