Never
rinse
one
of
these
new
high-speed
seamers
with
kerosene
or
gasoline.
If
the
front
end
of
the
machine
should
be
too
dirty
and
must
be
cleaned
with
kerosene,
be
careful
that
the
kerosene
does
not
come
in
touch
with
the
sealed
bearings.
Before
you
clean
this
part
of
the
machine,
remove
the
foam
plastic
pads
from
the
needle
bar
bearings.
After
the
front
end
of
the
machine
has
been
cleaned,
insert
new
pads
and
oil
them
accordingly.
Since
kerosene
removes
the
oil from
the
presser
bar
and
the
attached
parts,
these
parts
must
be reoiled
properly.
41.
Lubricating
Ordinary
Ball
and
Needle
Bearings
The
ordinary
ball
and
needle
bearings
incorporated
in
the
machine
are
stationary.
They
carry
the
arm shaft,
the
lower main
shaft
and
the
hook shaft.
Since
these
bearings do not make
any
motion, the
grease
remains evenly distributed over their entire surface
and
ensures
adequate
lubrication
throughout
the servoice life of
the
machine,
thus
obviating
the
use of
sealed-for-
life bearings. The latter are incorporated in moving parts,
such
as
the
take-up
lever
and
the
needle
bar
connecting
link,
because
these
parts
move
rapidly
and
reverse
their
direction
of
movement
constantly
so
that
the
grease
would be flung
out
of the bearings if the latter are
not
sealed
for
life.
An exception are needle bearings in
the
feed lifting
and
bobbin
case
opener
eccentrics which
are specially
designed
and
protected
against
any
loss of grease by lateral
caps
so
that
the
grease
will
not
be
flung
out
while
these
parts
move
to
and
fro.
The ball bearing in the feed driving eccentric in the gear case is open and pad-lubricated.
42.
The
Pad
Lubrication
in
the
Gear
Case
The feed driving and feed regulating mechanisms as well as the hook shaft driving gears in
the
gear
case
are lubricated by
means
of two oil-soaked foam plastic sheets. Unless
some
adjustment has to be made in the gear case, there is no need to open it until the oil has to be
changed which normally will be the case
about
once or twice a year. To change the oil, place
a plastic
sheet
under the machine to prevent oil soaking
the
table, tilt
the
machine back
and
remove the
gear
case
cover. Use
some
cotton
to
absorb
dripping oil.
Soak
the
foam plastic
sheets
with
4 fl.
oz.,
or
130
ccm,
of oil.
It is recommended to replace the foam plastic sheets by new ones rather than go to the
trouble of
washing
them
in gasoline. New
sheets
may be ordered by Nos.
69299
and
69302.
These
sheets
must be well
soaked
with 2.7
E/50°C
sewing
machine oil. Order No.
28001-
120110,
the
same
that
is
used
in
the
hook
lubrication
system.
When you replace the foam plastic sheets, push the smaller one behind the feed regulating
shaft
and
the
crank
drive. Insert
the
large
sheet
so
that
the
oil
tube
fits in
the
small lateral
slots
on the outside, and the large spur gear runs freely in the large cutout of the sheet. In this way,
any undersirable
contact
of
the
oil tube with moving parts is successfully eliminated.
Before you replace
the
gear
case
cover, make
sure
the
gasket
cemented
onto
its rim is not
defective. Clean and degrease the gasket and the rim of the gear case before you replace
the gear case cover. To do this, begin by turning in all screws loosely, then tighten them
crosswise.
50
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