CONTROL
PI
VALVE
SET
SCREW
.j
•..|a
ep One)
Fig.
6« Hook
Lubrication
(Step One)
HOOK
LUBRICATION
The bobbin
case
raceway is lubricated by oil
pumped
from
the hook saddle reservoir while the
ma
chine is operating. The amount of oil received by
hook raceway is very important. To check this, first
remove
bobbin
case.
Then
with
the
machine
running,
hold a small
piece
of white paper near the hook for
about 10 seconds. A distinct spray of oil should be
visible
on
the
paper.
If
there
is
no
trace
of
oil
or on
excess
of
oil
on
the paper, proceed with the following
steps:
1. Tip machine and loosen control valve
set
screw
shown in Fig. 6 and return machine to upright
position.
2. Turn control
valve
screw
shown in
Fig.
7
clock
wise
for more oil;
counterclockwise
for
less
oil.
Re-tighten
control
valve
set
screw.
A
short
test
run
of
at
least
a
minute
should
be
mode between
adjustments
to insure uniform oil flow.
After each adjustment of oil control valve screw, oil
control valve
set
screw should be securely tightened.
SPEED
Maximum
speed for machine 211G146 is 3500
stitches
per minute.
CONTROL
VALVE
SCREW
Fig.
7* Hook Lubrication (Step Two)
SPEED
Maximum
speed for mochines
211G151
and
211G157
is 4000
stitches
per minute.
Maximum
efficient
speed is dependent upon the
nature of the operation, the ability of the operator
and the
type
of materiel being sewn.
Never run a new machine at maximum
speed
im
mediately
following
a
new
installation. A speed of
500
stitches
per minute
less
than maximum is recom
mended for
the
first
100
hours
of
operation.
NEEDLES
For machine 211G146,
use
Singer
Needles,
Catalog
1740.
For
Machines
211G151
and
211G157,
use
Singer
Needles, Catalog
1901
for
1/4
inch clearance under
presser foot and Catalog 3355 for
3/8
inch clearance.
Size of needle for a particular operation is
deter
mined
by
size of thread and type of material to be
Orders for needles should state quantity required,
size
number and catalog number.
For example;
100 Needles, Size 14, Catalog 1740
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