Singer Centurion 121D - ARM SHAFT (Assembly)

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
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ASSEMBLY SEQUENCE
ARM
SHAFT
1 .
2.
3.
4.
5.
6.
7.
Insert
arm
shaft
from left to
right
into
arm
casting
with
counterweight,
intermediate
bearing
assembly,
bobbin
winder
drive
wheel
and
timing
belt
pulley
mounted
to it as
shown.
Make
sure
arrow
on
counterweight
is
in
direction
of
normal
rotation.
With
soft-faced
mallet,
lightly
tap
arm
shaft
from
left
to
right
until
front
arm
shaft
bear-
ing
is
properly
seated
in
casting.
Tighten
set
screws
in
intermediate
bearing.
Rotate
shaft
to
expose
flats
and
position
counterweight
with
set
screw
marked
(S)
over
flat.
Tighten
set
screw
and
tighten
other
set
screw.
Align
first
set
screw
in
direction
of
normal
machine
rotation
and
timing
belt
pulley
over
flat.
Tighten
same.
Tighten
other
set
screw.
Position
bobbin
winder
drive
wheel
and
tighten
set
screws.
Assemble
timing
belt
and
hand
wheel.
Tighten
all
remaining
set
screws.
Set
Screw
(S)
\
1
\ Arm
Shaft
Counterweight
Front Arm
Shaft
Bearing
35