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C8 Maintenance 7. Joint #3
7.3 Joint #3 - Replacing the Timing Belt
Timing belt
Maintenance
(Joint #3)
Parts
Belt tensile jig*
Hexagonal wrench
(width across flats: 3 mm)
Cross-point screwdriver (#2)
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 #3 motor, tilt the Arm #2 and press it against the Arm #2.
Reference: C8 Maintenance: 7.1 Joint #3 - 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 #3 Timing belt
1. Follow Removal steps (1) through (4) of C8 Maintenance: 7.1 Joint #3 – Replacing the Motor.
2. Loosen the Joint #3 motor unit set screw.
Hexagon socket head cap bolts: 3-M4×20
3. Remove the Joint #3 timing belt.
Installation: Joint #3 Timing belt
1. Pass the Joint #3 timing belt around the pulley 1 and the pulley 2 of the Joint #3.
Pass the timing belt to the pulley 2 first, then, place the timing belt to the pulley 1.
2. Secure the Joint #2 motor unit.
For details, refer to C8 Maintenance: 7.1 Joint #3 – Replacing the Motor, Installation steps (5) to (6)
and (9) to (10).
342
Name
C8-A701*** (C8)
C8-A901*** (C8L)
C8-A1401*** (C8XL)
(with a plain washer)
Qty.
1
471 mm
1655915
1
480 mm
1655918
1
501 mm
1655919
1
1674582
1
For M4 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
C Series Maintenance Manual Rev.2
Note
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