Lower Thread Trimmer Mechanism (2) - Brother HE-800A Service Manual

3. ASSEMBLY

3-3. Lower thread trimmer mechanism (2)

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1. Install the screw (1) to the base plate (2).
2. Install the lever assembly (3) and the lower thread retainer (4) to the base plate (2) with the collar (5) and the
screw (6).
3. Install the lower thread retainer (4) to the lever assembly (3) with the two screws (7).
4. Insert the roller of the lever assembly (3) into the cam groove of the knife driving lever (8).
5. Install the knife driving lever (8) to the base plate (2) with the shoulder screw (9), the collar (10), the washer U
(11) and the washer D (12).
6. Install the lower thread clamp plate assembly (13) to the base plate (2) with the shoulder screw (14), the plain
washer (15) and the washer (16).
7. Install the lower thread presser (17) to the base plate (2) with the shoulder (18) and the screw (19).
8. Install the fixed knife set (20) to the knife driving lever (8) with the two screws (21).
9. Install the needle plate (22) with the two flat screws (23) so that it is parallel to the base plate (2).
10.Provisionally install the base plate (2) to the top of the bed with the four screws (24).
11.While pushing the base plate (2) to the right so that the needle (25) is in the center of the needle hole (26) in
the longitudinal direction, securely tighten the four screws (24).
12.Connect the lower thread trimmer link assembly (27) and the knife driving lever (8) with the shoulder screw
4.37 (28).
50
Press down
Forward
Apply grease to cam
groove (8) and to (10)
HE-800A
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