Komatsu WA470-6 2006, Operation & Maintenance Manual

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4.1 Guides to maintenance
Maintenance
4-4
WA470-6H – VEAM946100
Avoid mixing oil:
If a different brand or grade of oil has to be added, drain the old
oil and replace all the oil with the new brand or grade of oil.
Never mix different brands or grades of oil.
Locking inspection covers:
Lock inspection cover in position securely with the lock bar. If
inspection or maintenance is carried out with the inspection
cover not locked in position, there is a hazard that it may be sud-
denly blown shut by the wind and cause injury to the worker.
Bleeding air from hydraulic circuit:
After repairing or replacing the parts of hydraulic circuit, or
removing the piping of hydraulic circuit, it is necessary to bleed
the air from inside of the circuit.
See "Change oil in hydraulic tank, replace hydraulic filter ele-
ment (4-77)".
Precautions when installing hydraulic hoses:
!
When removing parts at locations where there are O-rings or
gasket seals, clean the mounting surface, and replace with
new parts.
When doing this, be careful not to forget to assemble the O-
rings and gaskets.
!
When installing the hoses, do not twist them or bend them
into loops with a small radius.
This will cause damage to the hose and markedly reduce its
service life.