JUKI LU-1510N Engineer's Manual page 15

Adjustment Procedures
1. Loosen two setscrews 1 in the screw gear (small).
2. Draw out hook 2 in the direction of the arrow. (At this time,
bring No. 1 screw of setscrews 1 to the front of the operator.)
3. Replace thrust plate 3 and adjust so that a clearance of
1±0.1mm is provided between throat plate 4 and the top
surface of hook stopper section of hook 2.
(For the kind of thrust plate 3, refer to "5. Selective parts and
consumable parts".)
4. Assemble hook 2 so that the notched section of the shaft of
hook 2 comes to the front of the operator and tighten setscrews
1. (The notched section should align with No. 1 screw of
setscrews 1.)
™ In case of 2-needle, left and right are the same adjustment
value.
Adjustment Procedures
1. Turn the handwheel to bring inner hook guide 1 to its back
end position.
2. Turn inner hook 2 in the reverse direction of rotation of the
hook (in the direction of arrow mark A) and fit the inner hook
stopper to the inner hook stopping section in throat plate 3.
3. Loosen setscrew 4 in the inner hook guide arm and adjust the
clearance between inner hook guide 1 and the protruding
section of inner hook 2 to dimension A.
4. After the adjustment, securely tighten setscrew 4 in the inner
hook guide arm.
™ In case of 2-needle, left and right are the same adjustment
value.
Results of Improper Adjustment
™ S t i t c h s k i p p i n g o r t h r e a d
breakage will result.
™ Needle breakage will result.
™ Irregular stitches will result.
Results of Improper Adjustment
When the clearance is larger than
the specified value :
™ L o o s e s t i t c h e s o r t h r e a d
breakage will result.
When the clrarance is smaller than
the specified value :
™ Inner hook or inner hook guide
may be damaged.
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