5. Maintenance and Inspection
5.5 Procedure for Belt Replacement and Tuning
Applicable Units : RA4R, RA6R, RA7R, RA8R
5.5.1 Inspection of the Belt
For inspection work, detach the pulley cover with hexagonal wrench and carry it out by visual.
For RA4R, RA6R, RA7R, and RA8R, remove two hexagonal socket flat-head bolts (where marked with
a circle).
RA4R RA6R, RA7R, RA8R
The period of replacement for the belt cannot be clearly defined as the durability of it is impacted so
much by the operational conditions.
In generally speaking, it possesses bending life of several million times.
The timing belt gets worn away as the time passes, and it is necessary to have replacement at regular
intervals with the following conditions as reference.
• When the gear and belt area show obvious friction.
• When swelling occurs as a result of oil adhesion.
• When damages such as a crack occurs on the belt gear and back side.
Also, for the toothed belt, it is recommended to set the interval of regular replacement cycle when in
use under high wire fatigue condition in high acceleration and deceleration because it is difficult to
judge the right timing for replacement by checking appearance or looseness of the wires strengthening
the belt.
5.5.2 Belt to Use
IAI uses the following belt in our plant
IAI Maintenance Part Code
RA4R TB-RCP6-STRA4R 60S2M148 GB
Rubber, Super torque G Bareback
specification
(Mitsuboshi Belting Ltd.)
RA6R TB-RCP6-STRA6R 60S2M182GB
Rubber, Super torque G Bareback
specification
(Mitsuboshi Belting Ltd.)
RA7R TB-RCP6-STRA7R
100S3M225
GB
Rubber, Super torque G Bareback
specification
(Mitsuboshi Belting Ltd.)
Rubber, EV belt (Gates Unitta Asia)
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