Epson C12 Series, Manipulator Manual, Page: 235 / 314

Maintenance 7. Joint #3
C12 Rev.3 221
7.3 Joint #3 - Replacing the Timing Belt
Name Qty. Note
Maintenance
Parts Timing belt (Joint #3) 501 mm 1 1655919
Belt tensile jig* 1 1674582
Tools
Hexagonal wrench
(width across flats: 3 mm)
1 For M4 hexagon socket head cap bolt
Cross-point screwdriver (#2) 1 For cross recessed head screws
Torque wrench 1 For tightening torque control
Cloth (cushioning) 1 For pressing arms
Belt tension meter 1 Refer: Unitta U-505
* 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 Timing belt
1. Follow Removal steps (1) through (4) of Maintenance: 7.1 Joint #3 – Replacing the Motor .
2. Loosen the Joint #3 motor unit set screw.
Hexagon socket head cap bolts: 3-M4×20
(with a plain washer)
3. Remove the Joint #3 timing belt.
Installation: Joint #3 Timing belt
1. Pass the Joint #3 timing belt around the pulley 1 and the pulley 2 of the Joint #3.
Pass the timing belt to the pulley 2 first, then, place the timing belt to the pulley 1.
2. Secure the Joint #2 motor unit.
For details, refer to Maintenance: 7.1 Joint #3 – Replacing the Motor , Installation steps (5) to (6) and
(9) to (10).