Lower Looper Timing Adjustment - Brother SB3734T Service Manual

Adjustment
1. Put up the presser foot lever.
2. Loosen the two screws (set screw, socket (CP)
M4x4) for the UL eccentricity.
UL eccentricity
3. Turn the pulley counterclockwise rotation, and
then the needle bar is the lowest position.
Needle

Lower looper timing adjustment

Presser foot lever
Set screw, socket
(CP) M4x4
Pulley
Needle bar
3 - 6
4. Set the gauge and the spacer at the position of
the figure, and then attach the gauge with the
screw (set screw 3.75x8).
5. Pull the spacer, and then turn the pulley
counterclockwise rotation, and then contact the
needle clamp base.
Presser Needle
bar
bar
Gauge
Spacer
2.4 mm
Presser bar
bracket
Set screw 3.75x8
6. Turn the UL eccentricity, and then set the lower
looper at the position of the figure.
UL eccentricity
7. Fasten the two screws (set screw, socket (CP)
M4x4) for the UL eccentricity.
Set screw, socket (CP) M4x4
8. Remove the screw (set screw 3.75x8), and then
remove the gauge.
Gauge
Set screw 3.75x8
Needle
Needle (left)
Lower
looper
Contact to
the end face