19
990D
1.7 mm
Needle on the right
5 mm
Correct Setting:
When the upper looper is at the left most position, the distance between the center of needle on the
right and the center of looper eye should be 4.8 mm to 5.2 mm.
To adjust:
1. Remove the machine base.
2. Turn the handwheel to bring the upper looper to its lowest position. Loosen the hexagonal socket
screws A, and adjust the distance between the upper looper shaft guide and bottom of the upper
looper. The distance should be 1.6 mm to 1.8 mm when the upper looper is at the lowest position
as shown Fig. 1.
3. Tighten the hexagonal socket screws A.
4. Turn the handwheel and bring the upper looper to the leftmost position.
5. Loosen the hexagonal socket screw B, and adjust the distance between the center of needle and
center of upper looper eye as shown Fig. 2 and Fig. 3.
6. Tighten the hexagonal socket screw B.
7. Check the upper and lower loopers timing and the clearance between upper and lower loopers.
TO ADJUST THE POSITION OF THE UPPER LOOPER
(Fig. 1)
Upper looper shaft
Upper looper shaft guide
Upper looper
1.6 to 1.8 mm
4.8 to 5.2 mm
(Fig. 2)
Upper looper
Hexagonal socket screw
(Fig. 3)
Hexagonal bolt
