Needle Bar Assembly Attachment - Brother PE770 Service Manual

Modules
17

Needle bar assembly attachment

1. Apply a small amount of EPNOC AP(N)0 to the needle thread block 1.
2. Hand tighten the needle bar 2, needle thread block 1 and needle bar hook
stand assy 3 using the 2 screws 1.
(Fully tighten after 4 - 15 "Presser bar height," and 4 - 14 "Needle
threader.")
*Key point
• With the unit shaft D cut 4 facing forward, the upper surface
of the needle block 5 and the needle bar supporter assy 6
should be adjusted to approximately 10 mm separation.
• Adjust the space between the needle thread block 1 and the
needle bar hook stand assy 3 to approximately 2 mm.
• When the needle thread block 1 is viewed from the front, it is
secured in a position turned slightly counterclockwise
(see 4 - 14 "Needle threader")
.
Lubricate the needle bar crank joint area with
MOLYKOTE (OILER B ASSY 90% + MOLYKOTE
DISPERSION).
Apply EPNOC AP(N)0 to the sliding pin part of
the needle thread block.
Lubricate the needle bar supporter assy. needle
operating area with OILER B ASSY.
1
18
Lock nut attachment
1. Attach the screw 1 to the lock nut 1.
*Key point
• The screw 1 in approximately half its length.
2. Install the screw 1 in the upper unit holder.
*Key point
• Tighten until the lock nut 1 hits the upper unit holder.
3. Tighten the lock nut 1.
1
Needle-presser module
1 — 2 drops
Small amount
1 — 2 drops
Set Screw, Socket (FT)
M4X4
Hand tighten
Set Screw, Socket (CP)
M4X12
0.39 — 0.49 N·m
3 1
XZ0206***
XC8385***
XC8387***
XZ0206***
Torque
6
Torque
1
2
4
Approx.
2 mm
between
1 and 3
Approx. 10 mm
between 5 and 6
5
1 1
1 1
3 - 49