Adjusting The Driver Needle Guard; Adjusting The Needle Clearance; Adjusting The Shuttle Race Thread Guide - Brother LK3-B438E MKII Instruction Manual

10 . STANDARD ADJUSTMENTS

10-3 . Adjusting the driver needle guard

Needle center line
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set
screw w and turn the eccentric shaft e to adjust so that the driver needle guard q contacts the needle.
If the needle contact pressure is too great, skipped stitches may occur. On the other hand, if the driver needle
guard qis not touching the needle, the tip of the inner rotary hook will obstruct the needle, resulting in an
excessively high amount of friction.

10-4 . Adjusting the needle clearance

Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set
screw q and turn the eccentric shaft w to adjust so that the clearance between the needle and the rotary hook
is 0.01 - 0.08 mm.

10-5 . Adjusting the shuttle race thread guide

Install the shuttle race thread guide q by pushing it in the direction of the arrow so that the needle groove is
aligned with the center of the needle plate hole.
NOTE:
If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may
occur.
31
Tip
q
0.01 - 0.08mm
q
q
LK3-B438E Mark II
e
w
w