JUKI DDL-8700A-7 - Needle-to-Hook Timing; Feed Dog Height Adjustment

– 15 –
4) After making the adjustments mentioned in the above steps, align hook blade point
5
with the center
of needle
4
. Provide a clearance of 0.04 mm to 0.1 mm (DDL-8700AH-7 : 0.06 to 0.17mm) (reference
value) between the needle and the hook, then securely tighten setscrews in the hook.
If the clearance between the blade point of hook and the needle is smaller than the specied
value, the blade point of hook will be damaged. If the clearance is larger, stitch skipping will
result.
1
To adjust the height of the feed dog :
1
Loosen screw
2
of crank
1
.
2
Move the feed bar up or down to make adjust-
ment.
3
Securely t
ighten screw
2
.
If the clamping pressure is insufcient,
the motion of the forked portion be-
comes heavy.
(1) Adjust the timing between the needle and
the hook as follows :
1) Turn the handwheel to bright the needle bar
down to the lowest point of its stroke, and
loosen setscrew
1
.
(Adjusting the needle bar height)
2)
(For a DB needle)
Align marker line
A
on
needle bar
2
with the bottom end of needle bar
lower bushing
3
, then tighten setscrew
1
.
(For a D
A needle)
Align marker line
C
on
needle bar
2
w
ith the bottom end of needle bar
lower bushing
3
, then tighten setscrew
1
.
(Adjusting position of the hook
a
)
3)
(For a DB needle)
Loosen the three hook
setscrews, turn the handwheel and align marker
line
B
on ascend
ing needle bar
2
with the bot-
tom end of needle bar lower bush
ing
3
.
(For a DA needle)
Loosen the three hook
setscrews, turn the handwheel and align marker
line
D
on ascend
ing needle bar
2
with the bot-
tom end of needle bar lower bush
ing
3
.
0.04 to 0.1 mm
2
3
4
5
A
B
C
D
a
A
B
DDL-8700AS-7
0.75 to 0.85 mm
DDL-8700
AH-7
1.15 to 1.25 mm
1
2
20. Needle-to-hook relationship
21. Height of the feed dog
WARNING :
Be sure to turn the power OFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
WARNING :
Be sure to turn the power OFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.