Bobbin Case Holder Bracket Position - Brother Z-8550A Service Manual

9. ADJUSTMENTS
Maximum zigzag width
3526M

9-15. Bobbin case holder bracket position

77
4. Remove the presser foot (3), needle plate (4), auxiliary
1151B
needle plate (5), feed dog (6) and needle plate spacer (7)
(8560A only).
5. Turn the machine pulley to raise the needle bar (8) from
its lowest position until the reference line on the thread
take-up lever (9) is aligned with the Ø mark on the face
plate, and then check the following.
• The tip of the rotary hook (10) should be aligned with
the center of the needle.
• The distance from the tip of the rotary hook (10) to the
needle should be 0 to 0.05 mm.
6. If the above settings are not correct, loosen the two set
screws (11) and adjust the position of the rotary hook
(12).
After adjusting, securely tighten the two screws (11).
7. Set the zigzag width to the maximum setting (8 mm).
8. Turn the machine pulley to move the needle to its furthest
left position so that the tip of the rotary hook (10) is
aligned with the center of the needle, and check that the
distance from the upper edge of the needle hole to the tip
of the rotary hook (10) is 0.2 to 0.5 mm at this time.
* If the distance is not correct, carry out the adjustment
in "9-10. Needle bar height".
9. If needle deflection occurs when sewing material with
joints, bend the needle guard (13) as shown in the
illustration (A) so that it touches the needle.
* After this, check that the clearance between the tip of
the rotary hook (10) and the needle is 0 to 0.05 mm.
10. Press the TEST key (1). The TEST icon (2) will switch off.
(The mode will return to normal sewing mode.) Turn off
the power switch and continue the adjustment.
3525M
3527M
Adjust so that the end of the bobbin case holder position
bracket (1) is 0 to 0.5 mm back from end (A) of the inner
rotary hook (2).
* The end of the bobbin case holder position bracket (1)
must never extend to the right of end (A) of the inner
rotary hook (2).
1. Loosen the screw (3) and adjust the position of the
bobbin case holder position bracket (1).
2. Securely tighten the screw (3).
3528M
Z-8550A, 8560A