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Brother KM-4300 Instruction Manual Page 39

Lockstitch bar tacker.
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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.
- 3 6 -
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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From the library of: Superior Sewing Machine & Supply LLC

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