~12~
\(TROUBLESHOOTING)
J
Tro~
I I CeuH
ThrMd
breHa.
Stnc:n.
lklp.
Mechlne
!Ia.
not fMd work.
Needles installed improperly.
Upper
thread
ten
sion too
great.
Lower
thread
tension too
great.
Upper
thread
arm
thread
guide out of position.
Needle eyes too small for
threads.
Loopers damaged.
Needle groove
damaged
.
Needles hit loopers.
Wrong
timing of needles
and
loopers.
Needle hit loopers.
Needle eyes too small for
threads.
Needles installed improperly.
Looper points
are
dull.
Clearance between needles
and
loopers
too
great.
Needle and looper timing
wrong.
Lower
thread
take·up
timing wrong.
Upper
thread
tension
too
small.
Lower
thread
tension too
great
.
Upper
thread
take
·up
thread
2Uide
out
of
position.
Feed dog
too
low.
Presser
foot pressure
too
small.
Feed dog worn out.
Presser foot floats
and
does
not fully press work.
Feed dog and presser foot
work
on
one
side only.
I
.__I
_IMpect_ion
____,I
IL____~_Y
_
_,__I
Page----...JI
Direction
of
long groove.
Upper thread tension.
Lower thread tension.
Needle size
and
thread
Damaged
thread
way.
Burrs in long groove.
Clearance between needles
and loopers.
Timing
of needles and
loopers.
Clearance between needles
and needles guard.
Needle size and thread
Direction
of
long
gr
oove.
Lower
thread
take·up
timing.
Upper thread tension.
Lower thread tension.
Feed
dog
height.
Presser foot pressure.
Refer
to
instructions for
needle installing.
Adjust upper thread
tension.
Adjust lower thread
tensio
n.
Adjust upper thread arm
thread guide.
Refer
to
the section on
'
'N
eedl
es
and Threads"
Replace loopers.
Replace needle.
Adjust timing of loopers
running clear of needles.
Adjust timing of Needles and
loopers.
Adjust needles guard.
Refer to the section
on
"Needles and Threads".
Refer
to
instructions for
needle installing.
Adjust timing of loopers
running clear of needles.
Adjust needle and looper
timing.
Adjust lower
thr
ead take·
UP
timing.
Adjust upper thread tension.
Adjust lower thread tension.
Adjust upper thread take-up
thread guide position.
Adjust feed dog height.
Adjust presser foot pressu
re
.
f---
- - -
--
--------i
Have serviceman check it.
1------------------l
Have
serviceman check it.
Have seNiceman check them.
From the library of: Superior Sewing Machine & Supply LLC
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