Lower Thread Trimmer Mechanism (1) - Brother HE-800A Service Manual

3-2. Lower thread trimmer mechanism (1)

4175Q
4176Q
Apply grease
to (12)
4177Q
1. Insert the roller shaft (1) into the lower thread trimmer cam lever (2), and tighten the nut (3).
2. Place the roller (4) onto the roller shaft (1), and then install the retaining ring (5).
3. Install the lower thread trimmer cam connecting rod (6) to the lower thread trimmer cam (9) with the driving
lever roller (7) and the shoulder screw (8). (Lower thread trimmer cam assembly (10)).
4. Install the cover (11) to the bed.
5. Pass the lower thread trimmer cam assembly (10) through the cover (11) and install it to the bed with the two
lever shafts (12).
6. Tighten the two set screws (13) so that the lower thread trimmer cam assembly (10) moves smoothly without
any play.
7. Insert the roller (4) into the lower thread trimmer cam (9), and then install it to the bed with the lower thread
trimming cam shaft (14), washer (15) and retaining ring (16).
8. Tighten the set screw (17).
9. Connect the presser lifter connecting rod set (18) and the lower thread trimmer cam lever (2) with the spacer
(19), the plain washer D (20) and the bolt (21).
10.Install the lower thread trimmer link assembly (22) with the shoulder screw (23).
11.Connect the lower thread trimmer link assembly (22) and the lower thread trimmer cam connecting rod (6) with
the shoulder screw (24).
12.Install the opening plate assembly (25) with the shoulder screw (26).
13.Install the plate spring (27) as shown in the illustration.
Apply grease
to cam groove
(9) and to (14)
HE-800A
3. ASSEMBLY
Apply grease to (19)
Apply grease to (23)
4178Q
4179Q
4180Q
49