Adjusting The Needle Bar Height; Adjusting The Needle And Hook Timing - Brother HE-800A Service Manual

4-5. Adjusting the needle bar height

3972Q
1. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the
work clamp.
2. Set the needle bar (1) to its lowest position.
* Check that the needle is in the center of the needle hole. If adjustment is necessary, make the adjustment
while referring to "4-2. Adjusting the needle zigzag home position sensor position".
3. Remove the rubber cap (2) from the face plate, and then loosen the set screw (3) of the needle bar clamp.
4. Insert the "1" part of the gauge (4) between the needle plate (5) and the lower edge of the needle bar (1), and touch
the needle bar against the gauge.
* Different gauges are used for each of the two specifications -2 and -3, so make sure that the gauge being used
matches the specifications and application for the sewing machine being adjusted.
5. Tighten the set screw (3).
6. Install the rubber cap (2).
7. Check that the cutter flank of the needle bar (1) is at a right angle to the cutter.
Note: If the installation positions are not correct, the needle bar (1) and the cutter may touch when the needle
zigzags, which may result in noise or cause the needle to break.

4-6. Adjusting the needle and hook timing

2835Q
1. Turn on the power and set the sewing machine to the home position. Then press the RESET key to lower the
work clamp.
2. Loosen the two screws (2) of the rotary hook joint (1).
3. Turn the pulley in the regular direction of rotation (toward the front) so that the needle bar (3) just begins to rise
from its lowest position.
4. Insert the "2" part of the gauge (4) between the needle plate (5) and the lower edge of the needle bar (3), and
then align the rotary hook point (6) with the center of the needle when the needle bar contacts the gauge.
* Different gauges are used for each of the two specifications -2 and -3, so make sure that the gauge being used
matches the specifications and application for the sewing machine being adjusted.
3974Q
Mark
2168Q
HE-800A
4. ADJUSTMENT
Cutter
4290Q
Lowest
position
2837Q
83