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Adjustment Procedure
The following is the method of replacement when the motor ❶ is out
of order.
1. Remove the second setscrew ❷ of the hand wheel. (4mm hexag-
onal)
2. Remove the first setscrew ❸ (flat section) of the hand wheel. (4mm
hexagonal)
3. Remove the control box.
Refer to "3.-(12)-1) How to remove the control box".
4. Remove the window plate located behind the arm.
5. Loosen two coupling setscrews B ❹ (motor side) from the rear
side, in the order of the second screw and first screw (flat section).
(3mm hexagonal)
(Cautions) 1. No adjustments are required for the two coupling
setscrews A ❺.
2. For the removal of the coupling asm ❻, loosen two
coupling setscrews A ❺ used to fasten the main
shaft ❼. A clearance of 0.5mm shall be secured
between the motor ❶ and the coupling asm ❻.
3. Do not disassemble the coupling asm ❻.
6. Remove (four) motor setscrews ❽. (Examine motor installations
and the revolving direction.)
7. Pull out the motor ❶ gently from the coupling asm ❻.
8. Carefully install a new motor ❶ in the mounting position in correct
revolving direction.
Description
❶
Motor
❻
Coupling asm
9. In the procedures below, reassembly can be carried out in the
reverse order for disassembly.
Adjustment Procedure
The timing belt ❶ used is a product of the highest quality. There-
fore, no maintenance is required.
To make ready for responding to extra occasions, the method of
replacement is explained below.
1. Refer to "3.-(13) Replacement of the main motor" and dismantle the motor.
(Caution) It is unnecessary to dismantle the coupling.
2. Turn the motor by shifting the timing belt ❶ by hand in the direction
of the arrow.
3. Further reassembly work can be done in the reverse procedures
for disassembly.
4. Adjust the timing between the needle and hook blade point by
referring "3.-(2) Relationship between the needle and hook".
Part No.
40211082
40172398
– 70 –
Results of Improper Adjustment
○ If no clearance is secured, this
can be a cause of motor bearing
destruction.
○ After disassembly, reproducibility
will be lost.
Results of Improper Adjustment
Description
Timing belt ❶
○ When removing the timing belt ❶,
be careful not to hurt it with a sharp
tool like a screwdriver. Otherwise,
this will be a cause of breakage.
Part No.
40086731
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