typical GC0303DCX - Needle Bar Height and Hook Timing

25
26
1
2
DP X 17
B
6
5
2.0mm
1.3~1.8mm
7
6
5
0.05mm
DP×17
A
2
1
4
3
0.5 ~ 1.0mm
2
1
-13-
27. Adjusting the height of needle bar
and the timing with hook (Fig. 25)
When the needle bar ① is at its lowest position,
the top reference line (A) on the needle bar
should be aligned with the bottom edge of the
needle bar bush ②.
1.Turn the machine pulley to lower the needle
bar to its lowest position;
2.Take out the rubber cap ③;
3.Loosen the screw ④, and move the needle bar
① to proper position;
4.Tighten the screw ④;
5.Close the rubber cap ③.
Lift the needle bar ① from the lowest position,
when the second reference line (B) on the needle
bar is aligned with the bottom edge of the needle
bar bush ②, the tip ⑤ of the hook should be
aimed at the center of needle ⑥.
1.Turn the machine pulley to raise the needle
bar ① from its lowest position until the reference
line (B) is aligned with the bottom edge of the
needle bar bush ②
＊When the needle bar moves up 2mm, the clear
ance between the upper of needle hole and the
hook tip should be 1.3-1.8mm
2.Loosen the screw ⑦, and make the hook tip
aimed at the center of needle ⑥, the clearance
between the hook tip and needle should be
0.05mm
3.Tighten the screw ⑦.
28. Adjusting the oil pump (Fig. 26)
If the oil is not circled observed from the oil
gauge window at a lower sewing speed, turn the
oil adjustment plate ① to cover the oil hole.