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(1) Timing belt replacement period
The timing belt life is greatly affected by the robot working conditions, so a set time cannot be given. However, if
the following symptoms occur, replace the belt.
1) The belt tension value becomes less than the guideline value.
2) A position mismatch or gear teeth skipping occurs.
3) The belt is damaged as shown in
Table 5-5 ： Typical damage conditions of the timing belt
Damage condition
Gear tooth crack
Backside crack
Worn teeth
Tooth bottom abrasion and exposure of
cores
The following is not a belt damage.
Fibers coming out of the side face of the
belt
CAUTION
CAUTION
Table
5-5.
Due to the manufacturing of the timing belt, initial wear will occur. Wear chips may
accumulate in the cover after approx. 300 hr of operating the robot, but this is not a
fault.
When the belt is replaced, the machine system origin may deviate. After the replace -
ment, ensure to reset the origin.
Appearance
Maintenance and inspection procedures
5 Maintenance and Inspection
Cause
Overload
Deterioration of rubber due heat to or
ozone
Overload
Excessive or insufficient tension
Excessive tension
Manufacturing related factor.
This is not a belt damage.
5-73
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