Komatsu PC118MR-8 Operation And Maintenance Manual page 241

FUNCTIONING
USE OF THE MACHINE AND RELATED CONTROLS
Especially when the crusher or other large accessories are
used, if the movements reach the end of the stroke, the pins
around the bucket and the bucket cylinder pin may be subject
to excess loads and may break.
Operations for which it is not allowed to exploit the
dropping force of the bucket
Do not exploit the dropping force of the bucket to use it as a
pickaxe, breaker, or pile driver.
This may considerably reduce the life of the machine.
Operations for which it is not allowed to exploit the
dropping force of the machine
Do not exploit the fall force of the machine to carry out
excavations.
When excavating hard rock bed, use some other method to
break the rock into small pieces before excavating. This avoids
any damage to the machine and is also more economical.
Excavations on rocky ground
It is advisable to carry out excavations on hard rocky ground
after breaking it up with some other means, in order to avoid
damaging the machine and to ensure a more economic use of
the same.
Support the blade on both sides
When using the blade as a stabilizer, avoid loading all the
weight of the machine on one side of the blade only.
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