3. ASSEMBLY
HE-800A
69
3-20. Upper thread trimmer mechanism
1. Insert the upper thread trimmer fulcrum shaft (1) into the arm, and then tighten the two set screws (3) of the set
screw collar assembly (2) so that the upper thread trimmer fulcrum shaft (1) turns smoothly.
2. Install the rubber cap (4) from the top of the arm.
3. Install the spring hook plate (5) to the upper thread trimmer lever assembly (7) with the screw (6).
4. Attach the spring (8) to the stop plate (9) as shown in the illustration.
5. Install the back plate (10) and the stop plate (9) to the upper thread trimmer lever assembly (7) with the two
collars (11) and the two screws (12). Apply grease to the sliding surfaces.
6. Install the support stud (13) to the setting plate (16) with the nut (14) and the plain washer (15).
7. Install the setting plate (16) to the upper thread trimmer lever assembly (7) with the two screws (17) and plain
washers (18).
8. Press-fit the longitudinal feed arm pin (19) onto the longitudinal feed arm (20), and then secure it by tightening
the set screw (21).
9. Place the longitudinal feed arm roller (22) onto the longitudinal feed arm pin (19), and secure it with the two
retaining rings (23).
10.Install the roller shaft (24) to the support plate (27) with the nut (25) and the spring washer (26).
11.Place the driving arm roller (28) onto the roller shaft (24), and secure it with the retaining ring (29).
12.Install the support plate (27) and the stopper (30) to the trimmer driving arm (33) with the two bolts (31) and
plain washers (32).
4254Q
4252Q
4255Q
4253Q
Apply grease to (23)
Apply grease to (1)
Align edges
