These motors hove
the
some
dimensions
as
the
PE
260
and
PE
370 motors
and
ore
equipped
with a
voltage
selector switch which con
be
set
to
the
desired
voltage
range
by means
of
an
ordinary screwdriver. The voltage ranges incor-
porated
ore
as
follows:
105-130 volts
II
135-165 volts
Ill
200-250 volts
A specially dimensioned
speed
control
is
supplied with these motors.
Maintenance
Lubrication
Pfaff household sewing machine motors require
no
additional lubrication, for
they
are
equipped
with self-lubricating powder-metal bearings.
Importan
t
Before you
proceed
to check
the
electrical equipment, olwoys pull
the
plug
out
of
the
wall outlet
because
an
electric shock may
be
fatal.
Changing
the
Carbon
Brushes
The quality
of
the
carbon
brushes used in
our
sewing machines
guarantees
a
long service life.
When
replacing a used brush which
was
found
to
be
serviceable still, make
sure its worn
end
faces
toward
the commutator (the curvature
of
this worn
end
should match the curvature
of
the commutator). If it
is
inserted with
the
wrong
end
facing
the
commutator,. heavy sparking
will
result.
To
exchange
a
carbon
brush, unscrew the
cap
by turning it counter-clockwise,
and
toke
the
old
brush out. When inserting a
new
brush,
take
care
that
it
slides down into
the
duct
until it contacts the commutator. Then slip
the
cap
over
the spring, push it
against
the
brush duct,
and
screw it down by turning
it clockwise.
Take
care
that
the
new
carbon
brushes
are
the
same
quality
as
those used
in
the
motor
originally. The perfect working
of
the
mo
tor
and
a long service life
of
both
the commutator
and
the
brushes
depend
on
it.
Cleaning
the
Commutator
From time to time, check
and
clean
the
commutator. To
do
this, wipe
the
com-
mutator
with a
rag
moistened with cleaning fluid.
If
grooves
or
scorched spots
should occur
on
the
commutator, it
is
advisable
to
send
the
complete
motor
to
the
factory
for re-turning.
the
commutator, a job which calls for special skill.
Storing Sewing Heads and Cabinets
It
goes
without saying
that
sewing machine storerooms must
be
absolutely dry.
If
adverse
local conditions make it impossible to meet this requirement, it
is
36
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