C4 Maintenance 6. Joint #2
74 C Series Maintenance Manual Rev.2
6.1 Joint #2 - Replacing the Motor
Maintenance
Parts
AC servo motor 400 W 1
For the part code, refer to the 17. C4
Tools
Hexagonal
wrench
width across flats: 2.5 mm
For M5 hexagon socket set screw
For M4 hexagon socket head cap bolt
For M5 hexagon socket head cap bolt
The brake is mounted on the Joint #2 to prevent the arm from lowering due to its own weight while the Controller
power is OFF or the motor is OFF status. However, the brake does not work during replacement.
To replace the Joint #2 motor, tilt the Arm #2 and press it toward the Arm #1. (See the step (3)
When pressing the arm, put a cloth or a similar material between the arms to avoid each arm from contacting.
This also protects the arm surfaces and coatings.