Brother BE-438HS, Service Manual

Page: 150 / 223

9. ADJUSTMENT
139 KE-430HX/KE-430HS, BE-438HX/BE-438HS
9-8. Replacing the movable knife and fixed knife
1. Open the shuttle race cover, remove the two screws (1), and then remove the feed plate (2).
2. 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).
4. Install new fixed knife (7) in the position shown in the illustration.
5. Apply grease to the outside of the movable knife collar (8) and to the movable knife shoulder screw (9), and then install the
new movable knife (6) together with the thrust washer (10) and movable knife spacer (11).
6. Check that the movable knife (6) and the fixed knife (7) cut the thread cleanly.
7. Apply grease to the pin (12) of the movable knife, and then insert it into the hole in the movable knife connecting plate (13),
and then while inserting the pin (15) of TN-connecting plate assembly F into the hole in the thread nipper D assembly (14),
install the needle plate (5).
8. Check that the center of the needle hole and the tip of the needle are aligned.
Select an accessory movable knife spacer (11) which allows
the movable knife (6) to cross over the fixed knife (7) with a
force that is as gentle as possible while still allowing the
thread to be trimmed.
* Move the movable knife (6) as shown in the illustration and
check that it trims the thread cleanly.
NOTE:
If the movable knife spacer (11) is too thick, it will not be
possible to trim the thread.
2333B 3766B
3902B
2334B
For -5 specifications : 0.3 mm
Except for -5 specifications : 0.1 mm