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OUTLINE OF SERVICE
FILTERS
Filters are extremely important safety parts. They prevent impurities in the fuel and air circuits from entering
important equipment and causing problems.
Replace all filters periodically. For details, see the Operation and Maintenance Manual.
However, when working in severe conditions, replace the filters at shorter intervals according to the oil and fuel
(sulfur content) being used.
Never try to clean the filters (cartridge type) and use them again. Always replace with new filters.
When replacing oil filters, check if any metal particles are affixed to the old filter. If any metal particles are
found, please contact your Komatsu distributor.
Do not open packs of spare filters until just before they are to be used.
Always use Komatsu genuine filters.
RELATING TO ELECTRIC SYSTEM
It is extremely dangerous if the electrical equipment becomes wet or the covering of the wiring is damaged.
This will cause electrical leakage and may lead to malfunction of the machine. Do not wash the inside of the
operator's cab with water. When washing the machine, be careful not to let water get into the electrical compo-
nents.
Service relating to the electric system is check of fan belt tension, check of damage or wear in the fan belt and
check of battery fluid level.
Never install any electric components other than there specified by Komatsu.
External electrical interference may cause malfunction of the control system controller, so before installing a
radio receiver or other wireless equipment, please contact your Komatsu distributor.
When working at the seashore, carefully clean the electric system to prevent corrosion.
When installing an operator's cab cooler or any other electrical equipment, connect it to an independent power
source connector. The optional power source must never be connected to the fuse, starting switch, or battery
relay.
HANDLING HYDRAULIC SYSTEM
The hydraulic equipment is at high temperature during operations or after completion of operations. In addi-
tion, it is also under high pressure during operations, so pay careful attention to the following points when car-
rying out inspection and maintenance of the hydraulic system and components.
Stop the machine on level ground, lower the dump body, and take action to ensure that no pressure is
applied to the cylinder circuit.
Always stop the engine.
Immediately after stopping operations, the hydraulic oil and lubricating oil is at high temperature and high
pressure, so wait for the temperature at all parts to go down before starting maintenance.
Even when the temperature goes down, some parts may be under internal pressure, so when loosening
plugs, threads, or hose connections, do not stand immediately in front of the part. Loosen the parts slowly
to release the internal pressure before removing them.
When carrying out inspection and maintenance of the hydraulic circuit, always release the air from the
hydraulic tank to remove the internal pressure.
4-8
MAINTENANCE
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