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Adjustment Procedure Results of Improper Adjustment
Adjustment Procedure Results of Improper Adjustment
The following is the method of replacement when the motor is out of order.
1. Remove the second setscrew of the hand wheel. (4mm
hexagonal)
2. Remove the first setscrew (flat section) of the hand wheel. (4mm
hexagonal)
3. Remove the pulley cover.
Refer to [(14) Adjustment of external parts –1] Adjustment of pulley cover].
4. Remove the window plate (AK Specification included) located behind
the arm.
5. Loosen two coupling setscrews B (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 .
2. For the removal of the coupling asm , loosen two
coupling setscrews A used to fasten the main
shaft . A clearance of 0.5mm shall be secured
between the motor and the coupling asm .
3. Do not disassemble the coupling asm .
6. Remove four motor setscrews . (Examine motor installations and
the revolving direction.)
7. Pull out the motor gently from the coupling asm .
8. Carefully install a new motor in the mounting position in correct
revolving direction.
9. In the procedures below, reassembly can be carried out in the reverse
order for disassembly.
o If no clearance is secured, this can
be a cause of motor bearing de-
struction.
o After disassembly, reproducibility
will be lost.
Part name Part No.
Motor 40089196
Coupling asm 40051473
The timing belt used is a product of the highest quality. Therefore, no
maintenance is required.
To make ready for responding to extra occasions, the method of
replacement is explained below.
1. Refer to [4. Maintenance –(6) Replacement of the motor] and
dismantle the motor.
(Cautions) It is unnecessary to dismantle the coupling.
2. Let the sewing machine fall down and remove three setscrews of
the reverse feed solenoid . When the reverse feed solenoid is
dislodged, pull and take out the floater case .
(Cautions) It is unnecessary to dismantle the lubrication pipes,
etc.
3. Turn the motor by shifting the timing belt by hand in the direction
of the arrow.
4. Further reassembly work can be done in the reverse procedures for
disassembly.
o When removing the timing belt ,
be careful not to hurt it with a sharp
tool like a screwdriver. Otherwise,
this will be a cause of breakage.
Part name Part No.
Timing belt 40086731
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