Operation Manual

6.
Machine
Works
Heavily
Cause:
Remedy:
Hook raceway lacks oil or is
obstructed
by Clean and oil hook raceway.
pieces of thread.
Mechanism clogged by
inferior oil. Use only Pfaff sewing
machine oil — never
salad oil or glycerine.
Bobbin winder working while
sewing. Stop bobbin winder.
7. Motor idles
Cause:
Remedy:
Motor disengaging lever
raised. Flick
lever down (see
page 5).
Thread Jamming
The Pfaff rotary hook will
not
normally jam,
even
if
the
machine should
be
handled
improperly.
If thread should
happen
to
jam in
the
hook
raceway, the power of the motor in most instances
will
be
sufficient
to
overcome hard working
of
the mechanism.
If
this
action should not free
the
jammed
thread put
a
drop of kerosene
into the hook raceway,
jerk the
balance wheel
back, then rock
it
back and forth.
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