C8 Maintenance 6. Joint #2
C Series Maintenance Manual Rev.2 325
6.3 Joint #2 - Replacing the Timing Belt
Maintenance
Parts
Timing belt
(Joint #2)
Tools
Hexagonal wrench
(width across flats: 4 mm)
1 For M5 hexagon socket head cap bolt
For cross recessed head screws
For tightening torque control
* The belt tensile jig is an assembly jig. Use the jig when adjusting belt tension.
The brake is mounted on each joint to prevent the arm from lowering due to its own weight while the
Controller power is OFF or the motor is OFF status. The brake does not work during replacement.
Be careful when performing maintenance work.
When removing the Joint #2 motor, tilt the Arm #2 and press it against the Arm #1.
Reference: C8 Maintenance: 6.1 Joint #2 - Replacing the Motor, Removal step (2)
When pressing the arm, put a piece of cloth or a similar material between the arms to avoid contacting each
other. This protects the arm surfaces from scratching and paint peeling off.
Removal: Joint #2 Timing belt
1. Follow Removal steps (1) through (4) of C8 Maintenance: 6.1 Joint #2 – Replacing the Motor.
2. Loosen the Joint #2 motor unit set screws.
Hexagon socket head cap bolts: 3-M5×25
(with a plain washer)
3. Remove the Joint #2 timing belt.
Installation: Joint #2 Timing belt
1. Pass the Joint #2 timing belt around the pulley 1 and the pulley 2 of the Joint #2.
Pass the timing belt to the pulley 2 first, then, place it to the pulley 1.
2. Secure the Joint #2 motor unit.
For details, refer to C8 Maintenance: 6.1 Joint #2 – Replacing the Motor, Installation steps (5) to (6) and
(10) to (11).
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