Tension Release Mechanism (2) - Brother HE-800A Service Manual

3. ASSEMBLY

3-8. Tension release mechanism (2)

4207Q
0.5mm
or more
4208Q
1. Press the thread guide cover (2) on the arm thread guide L (1), and provisionally tighten the screw (3).
2. (After installing the needle bar thread guide by referring to "3-18. Needle bar and thread take-up mechanisms
(2)"), tighten the screw (3) to adjust the gap between the needle bar thread guide (5) and arm thread guide L (1)
to 0.5 mm or more when the needle bar (4) is at its highest point at the maximum right zigzag position (3 mm).
3. Connect the adjusting lever (6), lever link (7) and tension take-up lever (8) with the two shoulder screws (9).
4. Install the lever (10) to the adjusting lever (6) with the screw (11) and the washer (12). (Tension take-up lever
assembly (13))
5. Insert the washer (14) into the bottom of the tension take-up lever assembly (13), and then install it to the arm
with the shoulder screw (15).
6. Install the tension take-up lever assembly (13) to the tension release shaft (18) with the screw (16) and the
washer (17).
7. Place the two tension discs (19), tension disc pressers (20) and (21), tension adjusting spring (22), washer (23)
and tension nut (24) onto the sub tension stud (25). (Sub thread tension assembly (26))
8. Insert the tension release pin (27) into the sub thread tension assembly (26), and then install it to the arm.
* Adjust the thread tension while referring to "4-18. Adjusting the thread tension at the tack tension control".
9. Place the two tension discs (28), tension disc pressers (29) and (30) onto the tension stud (31), and then place
the collar (32) onto the tension stud (31) as far in as it will go.
10.Place the tension spring (33) and the washer (34) onto the tension stud (31), and then tighten the tension nut
(35). (Tension stud assembly (36))
11.Provisionally install the tension release lever bracket (37) to the tension stud assembly (36).
12.Attach the spring (38).
13.Install the tension release lever (39) with the shoulder screw (40).
14.Fully tighten the tension stud assembly (36).
56
HE-800A
4209Q
4210Q
4211Q