TO ADJUST THE POSITION OF UPPER LOOPER
When the upper looper (A) is at the leftmost position, the distance between the center of needle
on the right and the center of looper eye should be 4.8 to 5.2 mm (B).
To adjust:
1. Remove the machine base.
2. Make sure that the marking-off line on the upper looper drive cam is in line with the one on the
main shaft.
3. Loosen the hexagon bolt (C), and adjust the distance between upper looper shaft guide (D)
and bottom of upper looper (A). The distance should be 1.6 to 1.8 mm (E) when the upper
looper (A) is at the lowest position as show below.
4. Tighten the hexagon bolt (C). Be careful not to tighten too much, otherwise the upper looper
driving arm will be cracked.
5. Turn the balance wheel and bring the upper looper(A) to the leftmost position.
6. Loosen the hexagon socket screw (F), and adjust the distance between the center of needle
and center of upper looper eye as shown below (B).
7. Tighten the hexagon socket screw (F).
8. Check the upper and lower loopers timing and clearance between upper and lower loopers.
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