Presser Bar Mechanism - Brother HE-800A Service Manual

3. ASSEMBLY

3-19. Presser bar mechanism

4248Q
Align
Align
edges
edge
4249Q
1. Install the presser bar lifter link (1) to the presser bar guide bracket (3) with the shoulder screw (2), and then
install the set screw (4) to the presser bar guide bracket (3). (Presser bar guide bracket assembly (5))
2. Install the roller (6) to the roller shaft (9) with the plain washer (7) and the retaining ring (8).
3. Install the roller shaft (9) to the presser roller bracket (10), and then tighten the set screw (11).
4. Provisionally install the needle bar guide (12) to the arm with the two screws (13) as shown in the illustration.
5. Insert the presser bar (14) into the arm, and then pass it through the oil rejector (15) and the presser bar guide
bracket assembly (5).
6. Position the needle bar guide (12) so that the presser bar (14) moves smoothly, and then tighten the two screws
(13).
7. Tap in the rubber cap (16).
8. Install the presser roller bracket (10) to the presser bar (14) with the screw (17).
9. Connect the presser bar guide bracket assembly (5) and the knee lifter lever (18) with the shoulder screw (19).
10.Place a 10 mm gauge (21) underneath the work clamp (20).
11.Turn on the power, and after the mechanism moves to the home position, check that the setting for memory
switch No.05 (work clamp height at neutral position) is 10 mm. (If it is not set to 10 mm, set it to 10 mm.)
12.While pushing the presser bar (14) down from above, tighten the set screw (4) so that the roller (6) is not at an
angle to the V-shaped groove in the presser arm (22).
13.Remove the gauge (21) and turn off the power.
14.Insert the spring guide (23), compression spring (24) and plain washer (25), and with the presser adjusting
screw (26) at a height of 30 mm, tighten the presser adjusting nut (27).
68
Apply grease to (9)
Top
Bottom
Install with (15)
at the top
4291Q
HE-800A
4250Q
4251Q