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8.3 Joint #4 - Replacing the Timing Belt
Timing belt (Joint #4)
Maintenance
Parts
Belt tensile jig
Hexagonal
wrench
Cross-point screwdriver (#2)
Belt tension meter
Tools
Nippers
Masking tape
Wire tie (AB100 or equivalent)
Braid tube (600 mm or longer)
* 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.
Removal: Joint #4 Timing belt
1. Remove the Joint #4 motor unit.
For details, refer to C12 Maintenance: 8.1 Joint #4 – Replacing the Motor, Installation steps (1) through
(6).
2. Remove the connectors inside the Arm #3 and the air tube (transparent).
Connectors:
X71, X72, X041,
BR041, BR051, PS,
BT4, BT51, X141, X151, X161
3. Remove the cable bracket inside the Arm #3.
Hexagon socket head cap bolts: 4-M4×10
C Series Maintenance Manual Rev.2
Name
width across flats: 2.5 mm
width across flats: 3 mm
C12 Maintenance 8. Joint #4
Qty.
1
1655931
1
1674582
1
For M3 hexagon socket head cap bolt
1
For M4 hexagon socket head cap bolt
1
For cross recessed head screws
1
Refer: Unitta U-505
1
For cutting the wire tie
1
For protecting the connector clips
As
For passing the cables
needed
1
For passing the cables
Note
587
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