Singer 645 - Bobbin Winder and Motor Belt Adjustment

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ADJUSTING
BOBBIN
WINDER
It
may
be
sometime
required
to
adjust
the
level
of
rear
top
thread
guide
to
conform
with
the
level
of
bobbin
winder,
especially,
when
thread
winds
unevenly
on
bobbin.
If
the
thread
winds
unevenly
on
bobbin
as shown
(A),
loosen
set
screw
of
rear
top
thread
guide
and
move
the
thread
guide
up
slightly.
If
the
thread
winds
as
shown
(B),
move
the
thread
guide
down
slightly.
ADJUSTiNG
AND
CHANGING
MOTOR
BELT
Following
are
the
instructions
for
adjust
ing
and
changing
the
motor
belt:
(1)
Remove
four
screws
holding
rear
cover
by
tipping
it
out
at
the
bottom
and
pivoting
around
the
hand
wheel
away
from
the
front
of
the
machine
(2)
To
adjust
motor
belt,
loosen
screws
(A)and
move
bracket
(B)up
to
loosen
belt
and
down
to
tighten.
(3)
To
remove
motor
belt:
•
Remove
top
cover.
•
Loosen
clutch
(C).
• Loosen
screws
(A)
and
move
bracket
(B)
to
its
highest
posi
tion.
•
Slip
belt
off
motor
pulley
and
then
over
hand
wheel.
•
Replace
motor
belt
by
slipping
it
over
hand
wheel
and
then
over
motor
pulley.
•
Adjust
as
noted
under
No.
2.
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