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Maintenance 6. Joint #2
6.2 Joint #2- Replacing the Reduction Gear Unit
Reduction
gear unit
(Joint #2)
Maintenance
Parts
O-ring
(Joint #2)
Belt tensile jig*
Hexagonal
wrench
Tools
Cross-point screwdriver (#2)
Torque wrench
Belt tension meter (0.5 mm)
Belt tension meter
Cloth (cushioning)
* 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 timing belt, tilt the Arm #2 and press it against the Arm #1.
Reference: 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.
226
Name
C8-A701*** (C8)
C8-A901** *(C8L)
C8-A1401*** (C8XL)
C8-A701*** (C8)
C8-A901** *(C8L)
C8-A1401***
(C8XL)
width across flats: 2.5 mm
width across flats: 3 mm
width across flats: 4 mm
width across flats: 5 mm
Qty.
1
1674605
1
1674606
Arm #1
1
1263978
Arm #2
1
1656161
Arm #1
1
1670635
Arm #2
1
1656140
1
1674582
For M3 hexagon socket head cap bolts
1
For M5 hexagon socket set screws
1
For M4 hexagon socket head cap bolts
1
For M5 hexagon socket head cap bolts
1
For M6 hexagon socket head cap bolts
1
For cross recessed head screws
1
For tightening torque control
2
For adjusting the pulley position
1
Refer: Unitta U-505
1
For pressing arms
Note
C8 Rev.13
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