t
I
(jROUBLESHOOTING
GUID~
[
LT2-B831
·8832
J
8835·8836·8882
~--T_ro_u_b_le--~~
~~-------C-au_s_e------~~
~~-------C-he_c_k------~~~
~
______
R_e_m_e_d_v
______
~
~
Damaged rotary
hook
Polish the rotatmg hook
holding slot in the needle
plate.
holding slot.
Refer
to
''Thread Tension".
~
Improper upper
thread
-
Upper thread tension.
f---
Refer
to
p.
12
of
the
tension.
supplementary instruction
manual.
Set
the rotary hook and
Bobbin case opener gap.
-
bobbin case opener gap
to
0.2 mm.
-
Improper needle
and
1--
Needle and
rotary hook
Set the needle and rotary
rotary hook timing.
point
gap.
-
hook point gap
to
0.5 mm.
Rotary hook and
needle
H
Check that the needle plate
plate gap.
and
rotary hook gap
IS
approx. 1
.3
mm.
Needle bar
l1ft
stroke and
f---
AdJuSt
the needle
bar lift
height. stroke and height.
Thread breaks
1--
AdJuSt
the lubncatlng
011
InsuffiCient lubncat1on to
Rotary hook
lubrication.
supply
to
the rotary hook.
f--
the rotary hook assembly.
~
f---
Refer to
p.
7 of the supple-
mentary mstruct1on
manual.
Improper
thread take-up
Thread
take-up
Refer to 'Thread
Tens1on"
1-
~
spnng
in the supplementary
1n-
spring tension and stroke.
stroke and tension.
struction
manual.
-
Rotary hook point
Polish the
rotary
hook
damaged.
pomt.
~
Damaged needle hole in
Polish the needle hold
1n
the feed dog.
the feed dog.
~
Improper threading. Thread1ng
Refer to "Upper Thread-
ing".
H
Improper
needle mstalla-
Needle
groove direction
~
Install the needle
1n
the
t1on.
proper direction.
Bent or
blunt needle.
Needle
Replace
the needle.
H
·Refer to the "Thread breaks" section (above). Also check below.
H
l
~
Bobb1n sticks.
Replac-~
the bobbin.
Loose threads
When using a machine for
Replace
with
a
slotted
medium-thick materials.
presser foot (for med. thick
the thread does not tighten
materials).
...__
Replace
with
a slotted feed
properly
with
some mate-
dog (for med. thick mate-
rials.
ri<tlsl
From the library of: Superior Sewing Machine & Supply LLC
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