Sears 1345 - Manual (Page 23)

^CHECKING PERFORMANCE PROBLEMS,
SUSPECTED PROBLEM PROBABLE CAUSE
IRREGULAR
STITCHES Incorrect size needle.
Improper threading.
Loose upper thread tension.
Pulling fabric.
Light pressure on presser foot.
Loose presser foot
Unevenly wound bobbin,
Nicks or burrs at needleplate opening.
BREAKING
NEEDLE Pulling fabric.
Incorrect size needle.
Incorrect setting of needle.
Loose presser foot.
BUNCHING OF
THREAD Upper and lower threads not drawn back under presser
foot before starting seam.
PUCKERING Incorrect thread tensionisl.
Light pressure on presser foot.
Using two different sizes or kinds of thread.
Bent or blunt needle.
Loose presser foot.
Fabric too sheer or too soft.
SKIPPING
STITCHES incorrect size needle.
Certain knits and synthetics.
Bent or blunt needle.
Incorrect setting of needle.
Tight upper thread tension.
Light pressure on presser foot.
BREAKING UPPER
THREAD Starting to stitch too fast.
Improper threading.
Tight upper thread tension.
Incorrect size needle.
Sharp eye in needle.
Nicks or burrs at needleplate opening.
BREAKING BOBBIN
THREAD Improper bobbin case threading.
Lint in bobbin case or shuttle.
FABRIC NOT
MOVING Feed cover plate attached or feed dog down.
Light pressure on presser foot.
Thread knotted under fabric.
MACHINE JAMMING,
KNOCKING NOISE Thread caught in shuttle.
Damaged needle.
Bent needle plate.
MACHINE DOES
NOT SEW Power cord not connected.
Power/light switch off.
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