Needle Threader - Brother PE770 Service Manual

Adjustment
[Adjustment standard]
When passing the hook into the needle eye, the clearance between the upper edge of the hook and the upper edge of
the needle eye is 0mm.
[Adjustment procedure]
1. Remove the face plate assy..
2. Attach the size 75/11 needle.
3. Turn the pulley by hand to raise the needle bar to its highest position.
4. Loosen the socket screw (FT, M4x4), then move the needle thread block up and down and adjust the clearance
between the upper edge of hook and the upper edge of the needle eye is 0mm. After that, tighten the socket set
screw (FT, M4x4). (tightening torque: 0.78 to 1.18N· m)
*Key point
• Tighten the socket set screw (FT, M4x4) at the position slightly to the left when viewed from the front of the
machine. (Fig.2)
*Note
• In case the position of the socket set screw (FT, M4x4) is too left, the hook doesn't turn. (Fig.1)
• In case the position of the socket set screw (FT, M4x4) is too right, the needle thread block contacts the
needle bar supporter assy., and get damaged. (Fig.3)
Needle thread block
4 - 14

Needle threader

Socket set screw
(FT, M4x4)
Upper edge of
needle eye
0mm
Upper edge
of hook
NG OK
NG OK
Fig. 1 Fig. 2
Needle
Hook
NG
NG
Fig. 3