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Removal: Joint #5 Timing belt
1. Turn OFF the Controller power.
2. Remove the Arm #4 side cover.
For details, refer to C8 Maintenance: 3. Covers.
3. Loosen the Joint #5 motor unit set screws.
Hexagon socket head cap bolts: 2-M4×15
4. Remove the Joint #5 timing belt.
Installation: Joint #5 Timing belt.
1. Pass the Joint #5 timing belt around the pulley 1 and the pulley 2 of the Joint #5.
2. Secure the Joint #5 motor unit.
For details, refer to C8 Maintenance: 9.1 Joint #5 – Replacing the Motor, Installation steps (5) to (6) and
(11) to (12).
9.4 Joint #5 - Replacing the Electromagnetic Brake
Maintenance
Electromagnetic brake
Parts
Belt tensile jig
Hexagonal
wrench
Cross-point screwdriver (#2)
Tools
Torque wrench
Spanner (width across flats: 8 mm)
Feeler gauge (0.5 mm)
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.
C Series Maintenance Manual Rev.2
(with a plain washer)
Name
width across flats: 2 mm
width across flats: 2.5 mm
width across flats: 3 mm
C8 Maintenance 9. Joint #5
Qty.
1
2172928 (Common for Joints #4, #5, #6)
1
1674582
1
For M4 hexagon socket set screws
1
For M3 hexagon socket head cap bolts
1
For M4 hexagon socket head cap bolts
1
For cross recessed head screws
1
For tightening torque control
1
For air tube fitting
1
For adjusting the pulley position
1
Refer: Unitta U-505
Note
379
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