24
Mechanical Adjustment
MODEL: AirThread 2000D
To adjust the timing of the needle and the lower looper
When the needle comes up 3.4 to 3.8 mm from the lowest position, the tip of the lower looper comes to the left side of
the right needle (HAx1 SP #14).
To adjust:
1. Remove the face plate.
2. Open the looper cover and the side cover.
3. While pressing the upper knife release knob, turn it
clockwise by half a rotation to deactivate the upper
knife.
4. Remove the presser foot (unit).
5. Remove the needle plate.
6. Remove the left needle.
7. Attach an HAx1 SP #14 needle as the right needle.
8. Set the needle bar to the lowest position by turning
the handwheel toward you.
9. Place the timing gauge at the base of the bushing.
than place the needle bar gauge directry under the
timing gauge.
Tighten needle bar gauge thumbscrew lightly.
NOTE:
Make sure that there is no gap between the needle bar
lower bushing and the timing gauge or between the
timing gauge and the needle bar guage. Do not tighten
the thumbscrew too much. Otherwise, the surface fo the
needle bar may be damaged.
10. Remove the timing gauge. Turn the handwheel toward
you to raise the needle bar until the needle bar gauge
touches the needle bar lower bushing.
11. Loosen the bolt slightly. Turn the lower looper base to
the left or right until the tip of the lower looper comes
to the left side of the right needle.
NOTE:
Make sure that the clearance between the tip of the lower
looper and rear groove of the right needle is 0 to 0.05
mm, with the needle deflected by the needle guard (front).
12. Loosen the bolt and remove the needle bar guage.
13. Check the timing of the upper looper and the lower
looper and the clearance between the upper looper
and the lower looper (Refer to pages 27 and 28).
14. Attach the left needle.
15. Attach the needle plate.
16. Attach the presser foot (unit).
17. While pressing the upper knife release knob, turn it
clockwise by half a rotation to activate the upper knife.
18. Close the looper cover and side cover.
19. Attach the face plate.
Upper knife
Thumbscrew
Thumbscrew
Timing gauge
Needle bar gauge
Needle bar gauge
Needle bar gauge
Needle bar lower bushing
Needle bar lower bushing
Timing gauge
Upper knife release knob
Lowest
needle
position
Bolt
Upper knife release knob
Upper knife
