Pfaff 28 Owner's Manual - Page 20

Probable, Causes, Sewing, Troubles

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19 Probable Causes of Sewing Troubles Skipping of Stitches: 1. Neede inserted incorrectly, grooves facing the wrong way. 2. Other than proper needle system used. 3. Needle bent. 4. Needle threaded incorrectly. 5. Needle inadequate for the thread used. Breaking of Thread: 1. For any of the causes mentioned above. 2. Tensions too tight. 3. lnferior.quolity or knotty thread used. 4. Shuttle race insufficiently oiled. 5. Thread jamming in shuttle race. 6. Edges of needle hole damaged by the needle. Binding of Machine: 1. Driving belt too long. 2. Driving belt shortened too much. 3. Thread jamming in shuttle race. 4. Mechanism clogged. 5. Machine not oiled after having been cleaned with kerosene. Needle Breakage: 1. Needle bent. 2. Needle too thin or thread too thick. 3. Needle thread tension too tight. 4. Pushing or pulling of the work during the sewing. Uneven Stitches: 1. Tensions improperly regulated. 2. Thread used too thick, knotty or stiff. 3. Bobbin thread improperly wound. 4. Shuttle race insufficiently oiled. 5. Odd thread accumulated between tension discs.

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19
Probable
Causes
of
Sewing
Troubles
Skipping
of
Stitches:
1.
Neede
inserted
incorrectly,
grooves
facing
the
wrong
way.
2.
Other
than
proper
needle
system
used.
3.
Needle
bent.
4.
Needle
threaded
incorrectly.
5.
Needle
inadequate
for
the
thread
used.
Breaking
of
Thread:
1.
For
any
of
the
causes
mentioned
above.
2.
Tensions
too
tight.
3.
lnferior.quolity
or
knotty
thread
used.
4.
Shuttle
race
insufficiently oiled.
5.
Thread
jamming
in
shuttle
race.
6.
Edges
of
needle
hole
damaged
by
the
needle.
Binding
of
Machine:
1.
Driving
belt
too
long.
2.
Driving
belt
shortened
too
much.
3.
Thread
jamming
in
shuttle
race.
4.
Mechanism
clogged.
5.
Machine
not
oiled
after
having
been
cleaned
with
kerosene.
Needle
Breakage:
1.
Needle
bent.
2.
Needle
too
thin
or
thread
too
thick.
3.
Needle
thread
tension
too
tight.
4.
Pushing
or
pulling
of
the
work
during
the
sewing.
Uneven
Stitches:
1.
Tensions
improperly
regulated.
2.
Thread
used
too
thick,
knotty
or
stiff.
3.
Bobbin
thread
improperly
wound.
4.
Shuttle
race
insufficiently
oiled.
5.
Odd
thread
accumulated
between
tension
discs.