Problems
Needle
break
Thread break
Skip stitches
Loosen stitches
Troubleshooting
Possible Causes
1.
Needle is installed wrong
2. Wrong needle type
or
si
ze
3. Needle is bended
4. Wrong relation
with
rotary hook
5. Needle doesn't
center
the needle hole
of
throat plate
or
presser foot
1.
Low
quality thread
2. Thread
is
thicker than needle hole
3. Wrong threading
4. Thread tension is too strong
5. Needle is installed wrong
Possible So
lu
tio
ns
1. Install needle correctly
2. Use proper needle for fabric
and
thread
3. Replace needle
4. Readjust the rotary
hook
5. Readjust the needle plate and presser foot
1. Change the thread
2. Use proper needle
for
fabric and thread
3. Rethreaded the machine correctly
4. Readjust the thread tension
nut
5. Install needle correctly
6. Thread stand installed wrong
6. Install thread stand correctly
7.
Thread tension disc, thread guide, needle,
hook
point
7.
Grind off. polish
or
replace
by
a
new
parts
and
needle plate are burred
B.
Wrong relation with rotary
hook
B. Readjust needle
and
hook
point
relation
7. Wrong relation
of
needle
and
hook
point
1. Readjust needle
and
hook
point
2. Wrong threading 2. Rethread the machine correctly
3. Needle
is
installed wrong
3. Installed needle correctly
4. Inadequate thread tension
4.
Readjust the thread tension
nut
5. Hook
point
is damaged
5. Replace
by
a
new
part
6. Needle is bended
6. Replace needle
1. Wrong threading
1. Rethread the machine correctly
2. Thread is thicker than needle hole
2. Use proper needle for fabric and thread
3. Inadequate thread tension
3. Readjust the thread tension
nut
4. Wrong setting
of
needle
and
hook
point
4.
Readjust needle
and
hook
point
1. Thread tension is too strong 1. Readjust the thread tension
nut
2.
Take-up
spring is too strong
2. Readjust the take-up spring
Wrinkled stitches 3. Inadequate pressure
of
presser foot 3. Readjust the presser foot pressure
4. Inadequate
height
of
feed dog 4. Readjust the feed
dog
5. Needle
is
too thick
5. Use proper needle for fabric and thread
High Speed Straight Lockstitch Sewing Machine ! Instruction Manual and Parts List
22
From the library of: Superior Sewing Machine & Supply LLC
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