JUKI DDL-9000C-S Series Engineer's Manual page 165

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 hex-
agonal)
2. Remove the first setscrew ❸ (flat section) of the hand wheel.
(4mm hexagonal)
3. Remove the pulley cover.
Refer to "3. (11) -1) Adjustment of pulley cover" .
4. Remove the window plate (AK Specification included) 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 sec-
tion). (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 se-
cured between the motor ❶ and the coupling asm
❻.
3. Do not disassemble the coupling asm ❻.
6. Remove three 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 cor-
rect 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 "7.(6) Replacement of the motor" and dismantle the motor.
(Caution) It is unnecessary to dismantle the coupling.
2. Let the sewing machine fall down and remove three setscrews
❸ of the reverse feed solenoid ❷. When the reverse feed sole-
noid ❷ is dislodged, pull and take out the floater case ❹.
(Caution) It is unnecessary to dismantle the lubrication pipes, etc.
3. Turn the motor by shifting the timing belt ❶ by hand in the direc-
tion of the arrow.
4. Further reassembly work can be done in the reverse procedures
for disassembly.
Part No.
40172146
40172398
– 149 –
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