Movable Needle Guard Position Adjustment - Brother SB3734T Service Manual

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

Movable needle guard position adjustment

Pulley
Needle (left)
Lower
looper
Contact to
the end face
Lower looper
Movable
needle guard
UL lever
3 - 8
2. Loosen the two screws (screw, pan M3x4) for
the movable needle guard.
Movable needle guard
3. Move the movable needle guard, and then adjust
the gap of the lower looper to 1.5 to 2.0 mm, and
adjust the gap of the needle to 0 to 0.1 mm.
Needle (left)
0 to 0.1 mm
Movable needle guard
4. Fasten the two screws (screw pan M3x4) for the
movable needle guard.
Screw, pan
M3x4
UL lever
Lower looper
1.5 to 2.0 mm
Movable needle guard
Screw, pan
M3x4
UL lever