JUKI LU-2800 Series, Engineer'S Manual

Page: 17 / 143

– 5 –
Adjustment procedures Results of Improper adjustment
1. Set the feed pitch to the maximum (P=9).
2. Turn the handwheel to turn the feed base arm
❹
in the direc-
tion of the arrow.
Make sure that a clearance is secured in the hexagonal hole in
clamping screw, right
of the feed base arm into which a tool
can be inserted.
3. Only loosen clamping screw, right of the feed base arm.
4. Set the stitch dial to “0”. (Due to adjustment work of the initial
position of feed dog)
5. Turn the handwheel to bring the needle bar to the lowest dead
point of its stroke.
6. Loosen clamping screw ❶ of the needle bar rocking link.
7. In the state that the presser foot is raised, adjust the clearance
between presser bar
❼
and walking bar
❽
to dimension E,
then securely tighten clamping screw
❶
of the needle bar rock-
ing link.
8. Loosen clamping screw, left of the feed base arm.
9. Move the feed base ❺ to adjust so that needle ❻ enters the
center of the needle hole in feed dog ❷ . Then securely tighten
clamping screw, left of the feed base arm. (a = a’)
10. Perform the adjustment work of step 1. to 2.
11. Tighten clamping screw, right
of the feed base arm.
12. Check to be sure that the lateral clearances of feed dog ❷ in
terms of the window of throat plate ❸ to almost equal values. (A
= B)
In case of 2-needle, check to be sure that A = B and C = D are
almost obtained.
[Checking method]
1. Set the stitch dial to the maximum.
2. Turn the handwheel and make sure that feed dog
❷ does not
come in contact with the throat plate
❸
at the position where
the feed dog
❷
travels fully to the front or to the rear.
o
Stitch skipping or needle break-
age will result.
o
Poorly tensed stitches will result.