Needle Bar Height - Brother XM3700 Service Manual

Adjustment
[Standard]
At pattern selection dial [2] (straight stitch) and stitch width dial [5] (left base line), the
gap between the top of needle eye and the lower end of the outer rotary hook point in the
up/down direction should be 1.2 ±0.2 mm (1 to 1.4 mm) when the right edge of the needle
matches up with the outer rotary hook point.
[Adjustment]
1. Turn off the power, and then remove the foot controller.
2. Remove the face plate and the pattern selection dial, and remove the front cover and
the rear cover.
3. Remove the needle plate assy, the presser foot and the inner rotary hook assy.
4. Attach the size 90/14 needle.
5. Attach the pattern selection dial.
6. Turn the pattern selection dial until the [2] is the topmost position.
7. Turn the stitch width dial until the [5] is the topmost position.
8. Match up the right edge of the needle with the outer rotary hook point by turning the pulley by hand from the
rear to the front.
Stitch width dial
9. Loosen the screw 1 of the needle bar block.
10. Move the needle bar up and down, and adjust the gap
between the top of needle eye and the lower end of
the outer rotary hook point.
*Key point
• When moving the needle bar up and down, the
needle bar block do not be diagonal for the
machine.
11. Tighten the screw 1 of the needle bar block to
secure the needle bar.
*Key point
• Need to adjust "4-42 Needle threader" after this
adjustment.
1

Needle bar height

Pulley
Pattern
selection dial
Set Screw, Socket (FT)
M4X4
4 - 21
Needle bar
Needle
Right edge of needle
and tip coincide
Needle bar block
1
Needle block
1.2 0.2 mm (1 - 1.4 mm)
Needle eye
Outer rotary
hook assy
Hex wrench
2 mm
Tip coincide
Outer rotary hook