IAI America RCA2-TW4N - Manual (Page 115)

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13. Maintenance and Inspection
13.7 Belt
13.7.1 Inspection of Belt
Visually inspect the belt after removing the pulley cover.
Although the durability of the belt is affected significantly by the operating conditions, generally the belt
has a flex life of several million times.
As a reference of when the belt should be actually replaced, replace the belt if any of the following
conditions is observed:
x Significant wear of the teeth or end face of the belt
x Swelling of the belt due to attached oil, etc.
x Cracking or other damage to the belt teeth or back
x Breaking of the belt
13.7.2 Applicable Belt
Manufacturer: Bando Chemical Industries, Ltd.
Belt model (type) Model
40S2M138R, 4-mm wide (clean rubber type) TA4R
60S2M168R, 6-mm wide (clean rubber type) TA5R
60S2M198R, 6-mm wide (clean rubber type) TA6R
60S2M198R, 6-mm wide (clean rubber type) TA7R
13.7.3 Adjustment of Belt Tension
Remove the pulley cover, loosen the tension adjustment bolts (4 locations), and move the motor to the left
as shown below to tension the belt. After the adjustment is finished, tighten the tension adjustment bolts.
Tension adjustment bolt
Model Nominal thread size Tightening torque
TA4R M2.6
0.46 N-m
(0.047 kgf-m)
TA5R M3
0.83 N-m
(0.085 kgf-m)
TA6R/TA7R M4
1.76 N-m
(0.18 kgf-m)
Tension
TA4R: 1.5
r 0.1 kgf
TA5R/6R/7R: 2.5
r 0.1 kgf