Brother BAS-311G service manual Replacing the movable and fixed knives, Adjustment

7. ADJUSTMENT

7-10. Replacing the movable and fixed knives

5002Q

1.Loosen the two bolts (1) and then remove the feed plate (2).

2.Open the shuttle race cover, remove the two screws (3) and the two flat screws (4), and then remove the needle plate (5).

3.Remove the movable knife (6) and the fixed knife (7).

5003Q 5004Q

4.Install the new fixed knife (7) in the position shown in the illustration.

5.Apply grease to the outside of the collar (8) and to the shoulder screw (9), and then install the new movable knife (6) together with the thrust washer (10) and the movable knife spacer (11).

6.Check that the movable knife (6) and fixed knife (7) cut the thread cleanly. Replace the movable knife spacer with accessory spacers (t=0.2, 0.3, 0.4) so that the knives trim the thread accurately.

*If the knife pressure is too weak and the thread is not completely cut, use a thinner movable knife spacer.

*If the knife pressure is too strong and the movable knife (1) turns stiffly, use a thicker movable knife spacer.

7.Apply grease to the pin (12), place it into the movable knife connecting plate (13), and install it to the needle plate (5).

8.Check that the needle is aligned with the center of the needle hole.

BAS-311G, BAS-326G 95