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Check
For each intervention lubrication must be recorded, if necessary, the chain tensioning system
must be checked for abnormalities of alignment between the chain and pulley system attack.
The misalignments are very dangerous because they can induce high overstressing the chains.
Check for wear elongation
To control the elongation due to wear is necessary to establish a registration form.
Since probably will not wear the uniform along the entire length, the measure must be
made for features that are appropriately identifi ed. (Break the chain length in 5 sections)
It should be recognized that the original measure serves as a reference for subsequent ones
and should be kept in mind that all subsequent measurements must be made on the same
traits.
After a few measures you can identify which traits are more subject to the phenomenon of
wear, and then subsequent measurements can be restricted only to these traits.
The measurement can be made or slide gauge long enough or line graph. The reference
may be either the head of the pins or the profi le of the plate.
The maximum elongation is conservatively set at 2%.
Check wear plates profi le
After identifying the length of chain where this phenomenon is more evident, with a gauge
should be recognized the actual height of the plate eyelet and compared with the initial one.
They set the limit on the maximum acceptable wear (see Fig. 5.10):
Wear on one side [(H - H1) / H] x 100 < 2%
Wear on two side [(H – H2) / H2] x 100 < 3.5%
The high specifi c pressures between the plate and pulleys can cause plates, as well as wear,
even consummation of the material on the edge of the plate that can lead to blocked joints. If
you encounter locked joints, the chain must be replaced.
Fig. 5.10
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