– 12 –
When the timing belt is removed or exchanged, match the timing of the main
shaft and the hook shaft as follows:
1. Place the thread take-up at the highest dead point.
2. Match the carved line
❶
of the sewing hook thrust guard with the red carved
line
❷
of the belt.
3. With this condition, pass the timing belt to the lower sprocket.
21. EXCHANGING THE TIMING BELT
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following
work after turning the power off and ascertaining that the motor is at rest.
22. TIMING OF MAIN SHAFT AND HOOK SHAFT
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following
work after turning the power off and ascertaining that the motor is at rest.
23. HOW TO REMOVE THE BOBBIN CASE HOLDER
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following
work after turning the power off and ascertaining that the motor is at rest.
1. Remove the timing belt from the sprocket.
2. Remove the handwheel.
3. Loosen the set screw of the rear bushing and pull out the main shaft rear
bushing but be careful not to damage the bushing.
4. Pull out the timing belt from the hole from which the bushing was pulled out.
5. Install the new belt in the reverse order.
Remove the set screw
❶
of the left and right bobbin case pressers and pull out
the bobbin case holder.
❶
❷
❶
iv
iv
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