4. Maintenance and Inspection
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4.4.2 Inspection of the Belt
After checking the lubrication and dirtiness on the guide part, check the belt visually.
As the durability of the belt gets influenced widely by the operation time, the period for replacement
cannot be easily determined.
As the time of operation goes, degradation such as abrasion proceeds. Check the following items.
Items to Check
Check Contents
Breakage of belt
• Check if any breakage on belt
Abrasion, crack, tooth missing on
belt
• Check if any remarkable abrasion on teeth of the belt
• Check if any crack on the root of a tooth
• Check if any tooth missing
Hardening, softening and
deformation of belt
• Check if the belt is hardened, softened or deformed
(shrunk or expanded)
Abrasion on pulley teeth
• Check if any remarkable abrasion on pulley teeth.
Replace the belt if the situation suits to any of these below.
[Refer to 4.8 Procedure for Belt Replacement and Tuning]
• When an error was found in an inspection
• When back and forth operation reached 5,000,000 times
(Note 1)
Note 1 The wires giving the toughness to the toothed belt are difficult to determine degradation by
external visual. It is recommended to have a regular replacement cycle in every 5,000,000 times
of back and forth operation or even more often in use under a condition strict to wire fatigue from
high acceleration and deceleration.
Crack
Step
