Needle Bar Rising - Brother PE770 Service Manual

Adjustment
[Adjustment standard]
The right edge of the needle aligns with the outer rotary hook point when raising up the needle bar 2.29 to 2.69mm
from its lowest position.
[Adjustment procedure]
1. Start the test mode, and then select the "4" (3-point needle drop mode).
2. Press the [ ← ] button on the screen, then the needle moves to the left, and turn the power off.
3. Remove the front cover assy..
4. Remove the presser foot, the needle plate B and the needle plate A, and then remove the inner rotary hook assy..
5. Attach the size 75/11 needle.
6. Turn the pulley by hand and move the needle to its lowest position.
7. Loosen the 3 socket set screws (CP, M5x5) of the timing pulley D.
8. Turn the outer rotary hook by hand and adjust the right edge of the needle aligns with the outer rotary hook point
when raising up the needle bar 2.29 to 2.69mm from its lowest position.
9. Tighten the 3 socket set screws (CP, M5x5) of the timing pulley D. (tightening torque: 1.37 to 1.79N· m)
2.29 - 2.69mm

Needle bar rising

2.29 - 2.69mm
Timing pulley D
The right edge of the needle aligns
with the outer rotary hook point
when raising up the needle bar 2.29
to 2.69mm from its lowest position.
Socket set screw
(CP, M5x5) (3 locations)
4 - 11