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7.4 Joint #3 - Replacing the Electromagnetic Brake
Electromagnetic brake (Joint #3)
Maintenance
Parts
Belt tensile jig*
Hexagonal
wrench
Cross-point screwdriver (#2)
Tools
Torque wrench
Feeler gauge (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 #3 motor, tilt the Arm #2 and press it against the Arm #2.
Reference: 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 Electromagnetic brake
1. Remove the Joint #3 electromagnetic brake.
For details, refer to Maintenance: 7.1 Joint #3 – Replacing the Motor, Removal steps (1) through (10).
Installation: Joint #3 Electromagnetic brake
1. Mount the Joint #3 electromagnetic brake to the Joint #3 motor unit.
For details, refer to Maintenance: 7.1 Joint #3 – Replacing the Motor, Installation steps (2) through (10).
C8 Rev.13
Name
width across flats: 2.5 mm
width across flats: 3 mm
width across flats: 4 mm
Maintenance 7. Joint #3
Qty.
1
2172927
1
1674582
1
For M5 hexagon socket set screw
1
For M4 hexagon socket head cap bolt
1
For M5 hexagon socket head cap bolt
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
251
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