5. Maintenance and Inspection
4) Loosen the bolts (where marked with a circle; two bolts for RA4R, four bolts for RA6R, RA7R,
and RA8R) holding the motor with a 2.5mm-sized (RA4R), 3mm-sized (RA6R/RA7R) or 4
mm-sized (RA8R) hexagonal wrench.
Replace the belt if it is necessary.
RA4R RA6R, RA7R, RA8R4
5) Adjust the belt tension.
Hand a cable band (thin string) on the edge of the motor unit and pull it on a tension gauge
with the specified load (specified value of the belt tension).
When the load reached the specified, tighten the bolts (where marked with a circle) with a
2.5mm-sized (RA4R), 3mm-sized (RA6R/RA7R), or 4mm-sized (RA8R) hexagonal wrench to
hold the unit in the place.
Model Tension Force
RA4R 20 to 25N
RA6R 25 to 30N
RA7R 80 to 90N
RA8R 180 to 200N
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