JUKI DNU-1541 Engineer's Manual page 19

Adjustment Procedures
2) Top feed cam timing
™In case of DNU-1541 and DNU-1541S
1. Set the scale of stitch dial to "6".
2. Adjust the amount of alternate vertical movement to the
standard value.
(Refer to the item "8) Feed motion".)
3. Loosen two setscrews 1 in the top feed cam.
4. Turn top feed cam 5 to the position where three points of top
end 2 of the needle eyelet, top surface 3 of the throat plate
and walking foot 4 (pressing face) are aligned with one another
on condition that the amount of alternate vertical movement of
both the walking foot and the presser foot is equal.
5. Securely tighten the setscrews.
(Standard) The screw No. 2 in top feed cam 5 faces almost
right above at the lowest dead point of the thread take-up.
™In case of DNU-1541-7
1. Set the scale of stitch dial to "6".
2. Set the scale of alternate vertical dial to "3".
3. Remove the setscrews in the window place C and remove the
window plate C and the window plate packing C.
4. Loosen two setscrews 1 in the top feed cam.
5. Turn top feed cam 5 to the position where three points of top
end 2 of the needle eyelet, top surface 3 of the throat plate
and walking foot 4 (pressing face) are aligned with one another
on condition that the amount of alternate vertical movement of
both the walking foot and the presser foot is equal.
6. Securely tighten the setscrews.
(Standard) The screw No. 2 in top feed cam 5 faces almost
the front at the highest dead point of the needle bar as
observed from the window plate side.
Results of Improper Adjustment
™ Pitch error at high or low speed
is apt to occur.
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