Singer Centurion 121D - KNEE LIFT MECHANISM (Assembly)

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
ASS EMBLY SEQUENCE
KNEE LIFT
MECHANISM
1.
Position horizontal shaft,
thrust
washer,
collar
and vertical
link
connecting
arm in-
side
arm
casting
as shown.
Locate
collar
and
connecting
arm against
inside
walls
of
arm
casting
to retain
shaft
axially
except
for
.005"
-
.015"
end play.
2.
Assemble
vertical
link
to
connecting
arm
with
"E"
ring. Note the
letter
"T"
at one end
of the
link.
This
is the
end
to be
connected.
3.
Locate
arm
and
pivot pin
inside
bed
casting.
4.
Insert
horizontal
link
through
two
clearance
holes in bed
casting
(with r-ubber seal)
and
screw
into
pivot pin.
Insert
rubber
seal
into
first
clearance
hole.
5.
Mount
bell
crank
and
bracket
assembly
to bed
casting
with
two
screws.
Connect
both
horizontal
and
vertical
links
to bell
crank
assembly
with
to
"E"
rings.
6.
Mount
knee
lifter
stop
arm,
spring
and
drum
assembly
to bed
casting
with
threaded
stud,
long
point
set screw,
washer
and
hex
nut.
7.
Insert
knee
lifter
rock
shaft
(having
two
oil seals)
into
bed
casting
with
horizontal
link
connecting
arm, collar, sleeve
and
stop
arm
mounted
to it as shown.
Slide
sleeve
toward
front
end
of
rock
shaft
and
lock
in
place
with collar.
8.
Mount
spring
clip
to bed
casting
with
washer
and
screw. Position
spring
clip
in
groove of
extension
bar. Rock
shaft
is
adjustable
axially
to
do
this.
9.
Insert
knee
lift
extension
bar
assembly
into
rock
shaft.
10.
Lock
rock
shaft
in
place
with
set
screw
located
in bed
casting.
Position stop arm and
horizontal
link
connecting
arm
properly
and
lock
in place.
11.
Assemble
eccentric
cam
stud
to bed
casting
and
fasten
with
washer
and
hex nut.
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