HIGHLEAD GC24818-1D, Instruction Manual

Page: 9 / 30

and the needle should be located as described below.

The upper edge of needle eye is 1.3mm below the hook tip.

The clearance between the hook tip and the needle side surface is 0.05mm.
2
）
The relative positions of the hook and the needle can be adjusted as described below.
*The adjustment is easier when the presser foot and the throat plate are previously removed.

Adjustment of hook tip position (Fig.19.Fig.20.Fig.21)
a.Lean outward the machine head. Loosen three hook shaft gear screws.
b.Rotate the balance wheel by hand to position the needle to 2.2mm
above the needle DOWN position.
c.Rotate the hook by hand to align the hook tip with the center of the
needle.
d.Adjust the lateral position of the hook saddle so that the clearance between the hook tip and the needle
side surface is 0.05mm. To adjust, loosen screws
①
,
②
and
③
.
Note: Use care not to loosen set screw
③
excessively, and not to disengage the hook shaft gear (small)
from the gear (large).
e.Tighten the loosened screws in the
following order:
3) Lightly press the gear (large)
against the side wall of hook saddle and
tighten set screw
③
first.
4)
Check the clearance between
the needle and the hook and then tighten
screw
①
.
5)
Finally tighten screw
②
.
13.Timing between hook motion and take-up lever motion(Fig.22)
When the toothed belt is removed for replacement, the timing between the hook motion and the take-up
lever motion should be adjusted as follow
：
１）
Turn the balance wheel by land to locate the take-up lever to
its highest position.
２）
Lean outward the machine head to make sure the arrow mark
(timing mark) on the toothed belt pulley meets the black line put on
the bearing bracket.
３）
If the arrow mark is not in line with the black line, remove
the toothed belt and install again so that the two marks are in line, as
shown in the right figure.
—
6
—