Needle Threader Adjustment - Brother NV4000D Service Manual

Adjustment
1. Attach a needle.
2. Turn the pulley to raise the needle bar to the limit.
3. Loosen the socket set screw (FT, M4X4) securing the needle thread block.
4. Adjust the height of the needle thread block so that the threading hook passes through the needle hole, and secure
the needle thread block with the socket set screw (FT, M4X4).
*Key point
• Secure the socket set screw (FT, M4X4) at a position slightly to the left when viewed from the front of the
machine.
• Adjust the height so that the upper edge of the threading hook is level with the upper edge of the needle hole.
NOTE
• If the position of the needle thread block socket set screw is too far to the left, the hook will not operate and
treading is not possible.
• If the position of the needle thread block socket set screw is too far to the right, the needle thread block will
contact the needle bar supporter assembly, resulting in damage.
4 - 10

Needle threader adjustment

Fig. 1
Needle
Hook
Fig. 2