Pfaff 72 Owner's Manual - Page 26

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6. Machine Works Heavily Cause: Hook raceway lacks oil or is obstructed by pieces of thread. Mechanism clogged by inferior oil. Bobbin winder working while sewing. 7. Motor idles Cause: Motor disengaging lever raised. Remedy: Clean and oil hook raceway. Use only Pfaff sewing machine oil - never salad oil or glycerine. Stop bobbin winder. Remedy: 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. 27

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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.
27