Needle Zigzag Forward/Back Position - Brother Z-8550A Service Manual

9-11. Needle zigzag forward/back position

Adjust so that the following are obtained.
1147B
• The needle is in the center of the needle hole in the
forward/back direction.
• There is no play in the needle bar in the forward/back
direction.
• When the power switch is turned off, the needle bar can
be moved smoothly sideways by hand.
* Carry out adjustment with the sewing machine set to the
following conditions.
• With the needle bar base assembly (1) and the zigzag
joint (2) not secured.
• With the screw (5) and nut (6) loosened so that the
needle bar base presser pin (3) is further in than needle
bar base guide R (4) as shown in the illustration.
• With the bolt (7) loosened.
0148B
1. Remove the presser foot. (Keep it removed while
1148B
adjustment is being carried out.)
2. Loosen the two set screws (hexagonal hole, 2.5 mm
width across flats) (8) and then push needle bar base
guide R (4) to adjust the position.
Turn the machine pulley and check that the needle drops
into the center of the needle hole.
3. Securely tighten the set screw (8).
* After adjusting, check that there is no forward/back play in
the needle bar, and also check that the needle bar can be
smoothly moved sideways by hand when the power
switch is turned off.
* After adjusting, carry out the adjustment in "9-12. Needle
zigzag sideways position".
1149B
Z-8550A, 8560A
9. ADJUSTMENTS
74