–
11
–
13. Hook driving shaft pulley
Preparation
™
Remove outer components.
(Excluding stop solenoid)
™
Loosen idler.
™
Remove needle.
8
E-ring groove
6
4
5
!0
Moving knife roller arm
!1
Thread trimmer cam
2
Hook driving shaft pulley eccentric shaft setscrew
SM8040602TP
Hexagon 2.0 mm
5
Hook driving shaft pulley eccentric shaft
9
Thread trimmer cam screw No. 1
3
Hook driving shaft pulley E-ring (E-6)
6
Hook driving shaft pulley
eccentric shaft bushing
Slit on
4
hook driving shaft pulley
eccentric shaft
1
Timing belt
Disassembly
™
Remove timing belt from main
shaft pulley.
™
Remove
1
belt and loosen two
2
setscrews.
™
Remove
3
E-ring and turn
4
to
find a place where backlash in
hook driving shaft pulley is large.
™
Press
5
and push out
6
bushing
to the right side.
™
Draw out
5
and
6
, and remove
7
following the point of
7
.
Do not make a aw on
8
E-ring
groove when removing
3
E-ring.
Assembly
™
Enter hook driving shaft
7
pulley.
™
Enter eccentric
5
shaft and
6
.
™
Set
3
E-ring.
™
Remove the play in hook driving
shaft with
6
and tighten
2
set-
screw B.
™
Turn
4
shaft slit to adjust back-
lash in pulley and tighten
2
set-
screw A.
™
Set
1
belt.
Adjust backlash in eccentric shaft
by right rotation.
Point
When setting
6
bushing, do not
make a flaw on the end face of
bushing.
When setting belt onto main shaft,
refer to thread trimming timing.
(Simple method)
™
Lower needle bar 1.95 mm from
its upper dead point.
™
Turn hook driving shaft and orient
9
screw No. 1 to this side (just
front).
™
Enter contact of
!0
roller arm to
groove of
!1
cam.
™
Turn hook driving shaft in the re-
verse direction and set belt at the
position where it stops.
(Illustration of hook driving shaft pulley)
A
B
Make
7
hook driving shaft pulley
come out downward.
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