Removal Of Nozzle Up/Down (Nl) Axis Motor; Attachment Of Nozzle Up/Down (Nl) Axis Motor - Yamaha SIGMA-G5SII Service Information

4.7. Removal of Nozzle Up/Down (NL) Axis Motor

(1) Shut down the machine and turn off the power breaker.
(2) Release the cable harness for the NL-axis motor and unplug the cable.
(3) Loosen the coupling (M2.5L8) on the NL-axis ball screw side to prepare for the motor
removal.
(4) Loosen the M2.5 × L10 bolt and remove the motor.

4.7.1. Attachment of Nozzle Up/Down (NL) Axis Motor

(1) Remove the coupling from the removed motor and degrease the shaft section of the
new motor using alcohol.
Also, degrease the shaft section where the coupling on the NL-axis ball screw side is
inserted.
(2) Temporarily fix the NL-axis motor and coupling
on the motor side.
* Apply Screw Lock (1401B) on the coupling
fixing bolts.
* Set the gap between the coupling and motor
axis root so that it reaches about 2.5 mm.
* Arrange the bolt position so that the coupling
on the motor side can be fixed while the motor
is on the home position.
If all the above conditions can not be met, fix
the bolts temporarily.
In the case of temporary fixing, the following
items are performed.
Service Information
SI1705004E-00=SIGMA-G5SII Service Manual
139/273
For Service Engineer
2.5mm
Fig.D41