C4 Maintenance 9. Joint #5
120 C Series Maintenance Manual Rev.2
6. Remove the Joint #5 pulley 1 and the drive boss from the motor
shaft of the Joint #5 motor unit.
Drive boss and the pulley fixing screws:
Hexagon socket set screws: 2-M3×8 (with a brass bushing)
Pulley and the motor shaft fixing screws:
Hexagon socket set screws: 2-M3×8 (with a brass bushing)
There is a brass bushing in one of the set screws fixing the drive
boss and the pulley. Be careful not to lose it.
Pulley
Motor shaft
Drive boss
A : Pulley and
motor shaft fixing screws
B : Pulley and
drive boss fixing screws
C : Bushing
D : Flat face for motor shaft
E : Flat face for drive boss
A
A
B
C
C
B
D
E
7. Remove the Joint #5 electromagnetic brake.
Hexagon socket set screws: 3-M2.5×10
8. Remove the motor plate from the Joint #5 motor.
Hexagon socket head cap bolts: 2-M4×12
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