Brother NV4000D Service Manual page 254

Module
23
Needle holder ASSY assembly
1. Apply a bead of MOLYKOTE EM-30L to the needle bar hook 2 of the
needle bar block 1.
2. Insert the needle bar assembly 3 from the bottom of the needle holder
assembly, and then insert the needle bar block 1.
3. Apply a small bead of EPNOC AP (N)0 to the groove on the needle thread
block 4.
4. Insert the needle thread block 4 into the needle bar assembly 3, and then
tighten the screw 1 temporarily.
5. Adjust the needle threader, and then fully tighten the screw 1.
*Key point
• Refer to "Needle threader adjustment" on page 4 - 10 for the
adjustment procedure.
6. Insert the needle bar hook stand assembly 5 into the needle bar assembly
3, and then tighten the screw 1 temporarily.
7. Adjust the needle bar height, and then fully tighten the screw 1.
*Key point
• Refer to "Needle bar height adjustment" on page 4 - 9 for the
adjustment procedure.
8. Attach spring and the thrust washer 6 to the needle bar assembly 3,
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and then pass the needle bar assembly completely through the shaft hole on
the needle holder assembly.
*Key point
• Position spring
facing up.
9. Dip the needle bar operating section of the needle holder assembly in
sewing lubricant.
Apply MOLYKOTE EM-30L to the needle bar hook of
the needle bar block.
Apply EPNOC AP (N)0 to the groove on the needle
thread block.
Dip the needle bar operating section of the needle
holder assembly in sewing lubricant.
Start movie clip (CD-ROM version only)
1
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3 - 122
Needle-presser module
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with the end with the smaller diameter
Set Screw, Socket (FT)
M4X4
Color; Black
4.95
4 NEEDLE BAR PRESSER SPRING
8
3
Bead
Small bead
Dipping
Torque
·
0.98 N m
XC6254***
6 5
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1 2 1
4