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Adjustment Procedure
Results of Improper Adjustment
1) Standard adjustment
1. Adjust the feed dial graduations.
○ DDL-8000A*-SH : Feed dial graduation 4
(DDL-8000A*-SJ)
○ Other than DDL-8000A*-MS: Feed dial graduation 3
2. Let the sewing machine fall down and check the engraved
marker line position of the vertical feed cam
.
○ DDL-8000A*-SH : +20°(
❺
)
(DDL-8000A*-SJ)
○ Other than DDL-8000A*-MS : 0°(
❹
)
For adjustments, loosen two vertical feed cam setscrews
and adjust the cam to the engraved marker line
.
(Caution) The angle of the engraved marker line graduation 1
denotes 10°.
3. Loosen two lower sprocket screws
.
4. At the feed dog lowering timing (position where the upper end of
the feed dog coincides with the upper plane of the throat plate),
x the vertical feed cam
and slowly turn the ywheel in for-
ward direction until the upper end of the needle hole coincides
with the upper plane of the throat plate.
* In case of other than the DDL-8000A*-MS, the engraved
marker dot
of the pulley cover is matched with the
engraved marker dot
between the two engraved lines of
the ywheel.
When the top end of the needle hole is matched with the
top face of the throat plate, tighten two lower sprocket
screws
. (Tightening torque for reference: 4.5N•m)
5. Adjust the thread trimmer cam timing.
Refer to [3.–(11)-3) Thread trimmer cam standard timing].
6. Adjust the hook timing.
Refer to [3.-(2) Adjusting the needle and the hook].
(Cautions)
When the above-mentioned adjustments are fin-
ished, operate the sewing machine and examine
whether any unusual sound or torque is generated
or the thread trimmer unit works normally.
○
When tightening the two verti-
cal feed cam setscrews
, this
work should be done while a
good centering is secured.
Otherwise, there will be ad-
verse torque or unusual sound
generation, or abnormal wear
may be caused.
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