Epson C12 Series Manipulator Manual page 166

Maintenance 5. Joint #1
3. Apply proper tension to the Joint #1 motor unit and secure it.
When securing the motor unit, attach the heat dissipation sheet to the
right side of the base (when seeing from the rear side of the
Manipulator).
Joint #1 timing belt tension: 89 to 149 N
Belt tension meter setting values
Weight: 4.0 g/mm width × m span, Width: 20 mm, Span: 160 mm
Hexagon socket head cap bolts: 3-M6×30 (with a plain washer)
Tightening torque: 13.0 ± 0.6 N·m
NOTE
Regarding belt tension:

- Jumping (position gap) may occur if the value is below the lower limit.
- Vibration (abnormal noise) or reduction in life of the parts may occur if the value exceeds the upper
limit.
- When you replace with a new belt, belt extends and the belt tension may decrease in the initial stage.
Make sure to operate the robot two to three days and check the belt tension again.
When using the belt tension tensile jig (maintenance part):
Fix the belt tension tensile jig (for J1, J2, J3) to the Joint #1 motor
plate.
Hexagon socket head cap bolts: M5×45
Use the belt tension tensile jig (for J1, J2, J3) as shown in the photo
to apply a specified tension.
As the screw is tightened, the Joint #1 motor unit will be pulled and
tension will be applied.
Install the heat radiation block
For details, refer to the Heat radiation block Installation
152 C12 Rev.3