Adjusting The Needle Bar Height; Needle-To-Hook Relationship; Height Of The Feed Dog - JUKI DDL-8700 Instruction Manual

18.

NEEDLE-to-HooK rELatIoNSHIP

WarNING :
to protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
3
A
B
2
19.

HEIGHt oF tHE FEED DoG

WarNING :
to protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1
2
C
D
B
0.04 - 0.1 mm
4
5
a
0.75 - 0.85 mm
DDL-8700
0.7 - 0.8 mm
DDL-8700a
0.95 - 1.05 mm
DDL-8700H
1.0 - 1.1 mm
DDL-8700L
(1) adjust the timing between the needle
and the hook as follows :
) Turn the handwheel to brght the needle bar down
to the lowest pont of ts stroke, and loosen set-
screw 1 .

(adjusting the needle bar height)

2) (For a DB needle) Algn marker lne A on
needle bar 2 wth the bottom end of needle bar
A
lower bushng 3 , then tghten setscrew 1 .
(For a Da needle) Algn marker lne C on
needle bar 2 wth the bottom end of needle bar
lower bushng 3 , then tghten setscrew 1 .
(adjusting position of the hook a )
3) (For a DB needle) Loosen the three hook set-
screws, turn the handwheel and algn marker lne
B on ascendng needle bar 2 wth the bottom
end of needle bar lower bushng 3 .
(For a Da needle) Loosen the three hook set-
screws, turn the handwheel and algn marker lne
D on ascendng needle bar 2 wth the bottom
end of needle bar lower bushng 3 .
4) After making the adjustments mentioned in the
above steps, algn hook blade pont 5 wth the
center of needle 4 . Provide a clearance of 0.04
mm to 0.1 mm (DDL-8700H, 8700L : 0.06 to
0.17mm) (reference value) between the needle
and the hook, then securely tghten setscrews n
the hook.
If the clearance between the blade point
of hook and the needle is smaller than
the specified value, the blade point of
hook will be damaged. If the clearance is
larger, stitch skipping will result.
To adjust the heght 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 tghten screw 2 .
If the clamping pressure is insufficient,
the motion of the forked portion becomes
heavy.
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