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6.3 Joint #2 - Replacing the Timing Belt
Timing belt (Joint #2) 540 mm
Maintenance
Parts
Belt tensile jig *
Hexagonal wrench
(width across flats: 4 mm)
Cross-point screwdriver
Tools
Torque wrench
Cloth (cushioning)
Belt tension meter
* 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: C12 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 C12 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
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 C12 Maintenance: 6.1 Joint #2 – Replacing the Motor,
Installation steps (5) to (6) and (10) to (11).
C Series Maintenance Manual Rev.2
Name
(with a plain washer)
C12 Maintenance 6. Joint #2
Qty.
1
1655927
1
1674582
1
For M5 hexagon socket head cap bolt
1
For cross recessed head screws
1
For tightening torque control
1
For pressing arms
1
Refer: Unitta U-505
Note
555
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