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OM5055_US
It is not possible to precisely defi ne the lubrication periodicity. In fact, it varies according to the
frequency of use, the type of lubricant and the method of application, the work environment,
etc.
However, it can be said that the time interval between one lubrication and the other
must not exceed 12 weeks or 200 hours of work.
Check
At each lubrication operation, the chain tensioning systems must be adjusted, if necessary,
and check for any anomalies in alignment between the chain, attachment system and pulleys.
Misalignments are very dangerous because they can induce high overstresses on the chains.
Check for wear elongation
To keep elongation due to wear under control, a registration form must be prepared.
Since it is likely that the wear will not be uniform over the entire length, the measurement
must be carried out in sections (divide the length of the chain into 5 sections) which must
be suitably identifi ed.
The initial measurement must be taken which serves as a reference for the subsequent ones
and it must be borne in mind that all subsequent measurements must be made on the same
section. After some measurements it is possible to identify which sections are most subject
to wear and therefore subsequent measurements may be limited 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 he pins or the profile 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.
The following maximum acceptable wear limits are set (see Fig. 5.10):
Wear on one side [(H - H1) / H] x 100 < 2%
Wear on two sides [(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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