Hook Driving Shaft Pulley - JUKI TL series Service Manual

13. Hook driving shaft pulley

Preparation
○ Remove outer components.
(Excluding stop solenoid)
○ Loosen idler.
○ Remove needle.
❾ Thread trimmer cam screw No. 1
 Moving knife roller arm
(Illustration of hook driving shaft pulley)
❺
❽ E-ring groove
Disassembly
○ Remove timing belt from main
shaft pulley.
○ Remove ❶ belt and loosen two
❷ setscrews.
○ Remove ❸ E-ring and turn ❹ to
find a place where backlash in
hook driving shaft pulley is large.
○ Press ❺ and push out ❻ bush-
ing to the right side.
○ Draw out ❺ and ❻ , and remove
❼ following the point of ❼ .
Do not make a flaw on ❽ E-ring
groove when removing ❸ E-ring.
❺ Hook driving shaft pulley eccentric shaft
 Thread trimmer cam
❻
❹
Assembly
○ Enter hook driving shaft ❼
pulley.
○ Enter eccentric ❺ shaft and
❻ .
○ Set ❸ E-ring.
○ Remove the play in hook driv-
ing shaft with ❻ and tighten
❷ setscrew B.
○ Turn ❹ shaft slit to adjust
backlash in pulley and tighten
❷ setscrew A.
○ Set ❶ belt.
Adjust backlash in eccentric
shaft by right rotation.
❸ Hook driving shaft pulley E-ring (E-6)
❶ Timing belt
A B
❷ Hook driving shaft pulley eccentric shaft setscrew
SM8040602TP
Hexagon 2.0 mm
Make ❼ hook driving shaft pulley
come out downward.
When setting ❻ 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 ❾
screw No. 1 to this side (just front).
○ Enter contact of  roller arm to
groove of  cam.
○ Turn hook driving shaft in the re-
verse direction and set belt at the
position where it stops.
11
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❻ Hook driving shaft pulley
eccentric shaft bushing
Slit on ❹ hook driving shaft pulley
eccentric shaft
Point