SMC Networks ROBO Cylinder RGD4D - Manual (Page 51)

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Tension: 2.5 kgf
Motor-unit affixing bolts
(Use an Allen wrench of 2.5 mm across flats.)
Motor-unit affixing bolts
(Use an Allen wrench of 2.5 mm across flats.)
5) Adjust the belt tension.
Pass a looped strong string (or long tie-band) around the motor cover and pull it with a tension gauge
to the specified tension. In this condition, uniformly tighten the motor-unit affixing bolts.
[Recommended tightening torque for adjustment bolts]
162 N-cm (16.5 kgf-cm)