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8.2 Joint #4 - Replacing the Reduction Gear Unit
Maintenance
Reduction gear unit (Joint #4)
Parts
Belt tensile jig*
Hexagonal
wrench
Tools
Cross-point screwdriver (#2)
Torque wrench
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.
Removal: Joint #4 Reduction gear unit
1. Turn OFF the Controller power.
2. Remove the Arm #4 side cover and Arm #3 cover.
For details, refer to C12 Maintenance: 3. Covers.
3. Remove the Joints #5 and #6 motors.
For details, refer to the Removal steps in C12 Maintenance: 9.1 Joint #5 - Replacing the Motor and C12
Maintenance: 10.1 Joint #6 - Replacing the Motor.
4. Remove the cables passing through the Arm #4 as shown in the
photo.
For details, refer to the Removal steps in C12 Maintenance: 4.1
Cable Unit.
5. Loosen the fixing bolts of the Joint #4 motor plate and remove the
belt. (Do not remove the Joint #4 motor.)
Hexagon socket head cap bolts: 2-M4×15
6. Remove the bolts fixing the J4 flange, and remove the Arm #4 from
the Arm #3.
To remove all bolts, change the position of the Joint #4 by rotating
it.
Hexagon socket head cap bolts: 8-M5×30
C Series Maintenance Manual Rev.2
Name
width across flats: 2.5 mm
width across flats: 3 mm
width across flats: 4 mm
width across flats: 5 mm
(with a small plain washer)
C12 Maintenance 8. Joint #4
Qty.
1
1821978
1
1674582
1
For M3 hexagon socket head cap bolts
1
For M4 hexagon socket head cap bolts
1
For M5 hexagon socket head cap bolts
1
For M6 hexagon socket head cap bolts
For cross recessed head screws
1
1
For tightening torque control
1
Refer: Unitta U-505
Note
581
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