JUKI LK-980 Series User Manual

(14) Replacement parts
A. Replacement parts normally required
Part No.
B1818-280-000
B2422-980-0A0
B2424-280-000
B2426-280-000
B3112-761-000
Description
Needle
Shuttle
Moving knife
Counter knife
Needle plate needle
hole guide
Thread take-up
spring
Remarks on replacement
Provide a 0.3 to 0.5 mm (about 1/64") clearance at the shuttle
driver. Refer to "Standard adjustment (1)."
1) Use a washer of suitable thickness
for providing the moving knife
with a difference in height of
0.15 mm between its lowest point
and the highest point of the
needle plate needle hole guide.
B2423-280-00A Washer
B2423-280-00B
B2423-280-00C
B2423-280-00D
2) Since the used washer has a
concaved part created by the
hinged screw, make it flat by
using an oilstone before
installation. Otherwise, it will
interrupt the action of the
moving knife.
1) Adjust the height of the counter
knife by carefully using the blade
of a screw driver so that its
lowest point is 0.1 to 0.15 mm
above the lowest point of the
needle plate needle hole guide
when the protruded part of the
moving knife is passing by.
0.4 mm
0.5 mm
0.6 mm
0.7 mm
Remove this part by
an oilstone.
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2) In order to evenly cut 2
threads at a time, the
counter knife has a slanted
blade. Pass 2 threads
through the needle hole
guide and check if they
are evenly cut.
If the right thread can not
be sharply cut, increase the
slope by carefully scraping
the part (A). If the left thread can not be cut well, decrease
the slope by scraping the part (B) with an oilstone.
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Left
thread
Counter knife
Right
thread
Replace it as soon as the needle hole is scratched or the needle
hole has been enlarged. At the same time, correct the height of
the counter knife as mentioned in the previous paragraph.
1) After replacing the spring, check that the bolt of the tension
post and the screw of the tension post socket are firmly
tightened, because they will affect the thread trimming
action.
2) Also, check the timing of thread release action according to
"Standard Adjustment (13)."
- 37 -
From the library of: Superior Sewing Machine & Supply LLC

JUKI LK-980 Series Specifications

General

Brand	JUKI
Model	LK-980 Series
Category	Sewing Machine
Language	English