– 12 –
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 flaw 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
setscrew B.
™ Turn 4 shaft slit to adjust
backlash in pulley and tighten 2
setscrew 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
reverse direction and set belt at
the position where it stops.
(Illustration of hook driving shaft pulley)
AB
Make 7 hook driving shaft pulley
come out downward.
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