Lower Knife / Upper Knife Position Adjustment - Brother SB3734T Service Manual

Adjustment
Lower knife
1. Loosen the screw (screw, bind M4x6) for the
lower knife.
Screw, bind M4x6
2. Adjust the knife position of the lower knife to the
height same as the face of needle plate.
Needle plate
3. Fasten the screw (screw, bind M4x6) for the
lower knife.
Screw, bind M4x6

Lower knife / Upper knife position adjustment

Lower knife
3 - 19
Upper knife
1. Turn the pulley counterclockwise rotation, and
then the upper knife is the lowest position.
2. Loosen the screw (screw, bind M4x8) for the
upper knife.
3. Adjust the upper knife at the position of the figure.
0.5 to 1.0 mm
Lower
knife
4. Fasten the screw (screw, bind M4x8) for the
upper knife.
*Key point
• Set the upper knife to the highest position,
and then put in the upper section of the knife
release lever and the screw for the lower
knife to the same line.
Knife release lever
Pulley
Upper knife
Screw, bind M4x8
0.3 to 1.1 mm
Upper
knife
In the same line
Screw, bind M4x8