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1. Remove the four set screws of the motor.
2. Loosen the two set screws of the coupling.
3. Remove the motor and coupling from the lower shaft .
4. Remove the six set screws , and remove the window plate .
5. Remove the timing belt from the pulley .
6. Loosen the two setscrews from arm hole.
7. Loosen the two setscrews of the pulley , and remove the pulley
.
8. Tap the rear bearing from inside and pull out this rear bearing .
9. Pass the timing belt through the bearing hole of the arm and
remove (pull out) the timing belt via the main shaft .
10. Install a new timing belt .
11. Degrease the outer diameter of the rear bearing and the inner
diameter of the arm, apply a sealant of medium or higher strength,
and drive the rear bearing until it stops in the interior.
12. Tighten two setscrews from the armhole. (There is no flat section.)
13. Join the flat section of the main shaft with the first screw of the
pulley , and mount the pulley .
At that time, the clearance should be about 0.5mm between the pulley
and the arm.
14. Turn the pulley and let the needle bar stay in the UP dead
position.
At that time, the timing belt is hung in the position where the flat
section of the lower shaft faces the front.
15. Join the flat section of the lower shaft with the first screw of the
coupling, and tighten two setscrews .
16. Tighten four motor setscrews to fix the motor .
17. Fix the window plate with six setscrews .
Adjustment Procedures Results of Improper Adjustment
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