Needle Bar Height - Brother PE770 Service Manual

Adjustment
[Adjustment standard]
When turn the pulley by hand until the right edge of the needle aligns with the outer rotary hook point, the clearance
between the top of the needle eye and the outer rotary hook point is 1.6 to 2.0mm.
[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 face plate assy. and the thread guide.
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 until the right edge of the needle aligns with the outer rotary hook point.
7. Loosen the socket set screw (CP, M4x4) of the needle bar block.
8. Move the needle bar up and down, and adjust the clearance between the upper edge of the needle eye and the
outer rotary hook point to 1.6 to 2.0mm.
*Note
• Check the socket set screw (CP, M4x4) faces front.
9. Tighten the socket set screw (CP, M4x4) of the needle bar block. (tightening torque: 0.78 to 1.18N· m)
*Key point
• Need to adjust "4-14 Needle threader" after this adjustment.
Socket set screw
(CP, M4X4)
Needle bar block
4 - 12

Needle bar height

Needle bar
Right edge of needle
and hook point aligns
1.6 - 2.0mm