Komatsu GD555-5 Operation & Maintenance Manual page 250

MAINTENANCE
Dusty worksites:
When working at dusty worksites, do as follows:
Inspect the air cleaner clogging monitor frequently to see if the dust indicator is clogged.
Clean the air cleaner element at a shorter interval than specified.
Clean the radiator core frequently to avoid clogging.
Clean and replace the fuel filter frequently.
Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
When inspecting or changing the oil, move the machine to a place that is free of dust to prevent dirt from getting
into the oil.
Avoid mixing oils:
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 brand or grade of oil.
Locking inspection covers:
Lock inspection cover securely into position with the lock bar. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly blow shut by the wind and cause
injury to the worker.
Bleeding air from hydraulic circuit:
When hydraulic equipment has been repaired or replaced, or the hydraulic piping has been removed and installed
again, the air must be bled from the circuit.
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 sharply. If they are installed so, their service life will
be shortened extremely and they may be damaged.
Checks after inspection and maintenance:
If you forget to perform the checks after inspection and maintenance, unexpected problems may occur, and this may
lead to serious injury or property damage. Always do the following:
Checks after operation (with engine stopped)
Have any inspection and maintenance points been forgotten?
Have all inspection and maintenance items been performed correctly?
Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped
inside the machine and get caught in the lever linkage mechanism.
Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?
Checks when operating engine
For details of the checks when operating the engine, see "TWO WORKERS FOR INSPECTION AND
MAINTENANCE WHEN ENGINE IS RUNNING (PAGE 2-34)" and pay careful attention to safety.
Are the inspection and maintenance items working properly?
Is there any leakage of oil or fuel when the engine speed is raised?
GUIDES TO MAINTENANCE
4 - 3