HIGHLEAD GC20618-1DZ, Instruction Manual Parts Catalog

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— 6 —
To adjust needle thread tension,turn each tension adjusting nut.
Needle thread tension can be also adjusted for special fabric and thread by changing intensity and movable
range of slack thread adjusting spring.
15.ADJUSTMENT OF PRESSER FOOT PRESSURE
Pressure of presser foot is to be adjust in accordance with thickness of materials to be sewn.
First loosen lock nut.For heavy materials,turn the adjust bolt to increase the pressure,while for light
materials,turn the adjust bolt to decrease the pressure as shown in Fig. After the adjustment.Tighten the lock nut.
16.TIMING BETWEEN ROTATING HOOK MOTION AND NEEDLE
MOTION
（
1
）
Set the stitch length to “6”on the stitch length dial.
（
2
）
When the needle is lifted 2.4mm from the lower dead
point,the following positional relationship should be maintained:
a
．
The lower edge of needle eye should be 2.3mm below the
hook point.
b
．
The center of the needle the hook point is on a line.
c
．
Gap between the hook point and the side face of needle
should be 0.05mm.
Note:Positioning of hook point
（
1
）
When the needle is at DOWN position,the smaller gear
should be engaged with the large gear so that the “S”screw of the
latter gear on the reverse side.
（
2
）
Tighten each “S”screw,where is punched for set screw,on
the hook shaft.