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Trouble shooting
Trouble
Cause
Check point
Thread slips out of needle
Thread take-up lever stroke
Stroke
of thread
take-up
at first stitch
too small.
lever.
Therad breaks
Skipped stitches
Needle breaks
Upper thread tension too
great.
Needle incorrectly installed.
Thread
too thick for
needle.
Lower
thread
tension
too
great.
Clearance
between
needle
and tip of shuttle hook too
large.
Poor contact
between
needle and shuttle
hook.
Needle received too deeply
into shuttle driver.
Needle
is bent.
Needle incorrectly installed.
Needle contacting
tip of
shuttle hook.
Needle
is
bent.
Wayward stitching.
Upper thread tension.
Direction
of needle.
Needle and thread.
Lower thread
tension.
Clearance
between
needle
and shuttle
hook.
Needle bar stroke.
Clearance
between
shuttle
driver and needle.
Bent needle.
Direction of needle
Clearance
between
needle
and shuttle
hook.
Bent needle.
— Needle and feed timing.
Remedy
Adjust
stroke
of
thread
take-up lever to suit fabric
being sewn.
Adjust to appropriate
ten
sion.
Install
needle
with
long
groove facing front.
See "Selecting a needle and
thread".
Adjust to appropriate
ten
sion.
Adjust
clearance
between
needle
and
shuttle
hook.
Adjust stroke of needle bar.
Adjust
shuttle
driver and
needle
contact.
See "Selecting a needle and
thread" and replace needle.
Install
needle
with
long
groove facing front.
Adjust
clearance
between
needle
and
shuttle
hook.
See "Selecting a needle and
thread" and replace needle.
Adjust
needle
and
feed
timing.
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