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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 attached to the old filter. If any metal particles are found,
contact your Komatsu distributor.
Do not open packs of spare filters until just before they are to be used.
Always use Komatsu genuine filters.
ELECTRIC SYSTEM MAINTENANCE
It is extremely dangerous if the electrical equipment becomes wet or the covering of the wiring is damaged. This
will cause an electrical short circuit 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
components.
Service relating to the electric system is checking fan belt tension, checking damage or wear to the fan belt and
checking battery fluid level.
Never install any electric components other than those specified by Komatsu.
External electro-magnetic interference may cause malfunction of the control system controller, before installing
a radio receiver or other wireless equipment, 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 cables to supply power to the optional equipment must never be connected to the fuse,
starting switch, or battery relay.
HANDLING HYDRAULIC SYSTEM
Hydraulic equipment is at a high temperature during operations and immediately after operations. During
operations, it is also under high pressure, so be careful of the following points when carrying out inspection and
maintenance of hydraulic-related equipment.
Stop the machine on level ground, lower the bucket completely to the ground, and set so that there is no
pressure on the cylinder circuits.
Always stop the engine.
Immediately after the engine is stopped, the hydraulic oil and lubricants are at a high temperature and high
pressure. Wait for the temperature to go down before starting the maintenance operation.
Even when the temperature goes down, the circuits may be under internal pressure, so when loosening plugs,
screws, or hose connections, do not stand directly in front. Loosen gradually to release the internal pressure
before removing.
Always release the air in the hydraulic tank to remove the internal pressure before carrying out inspection and
maintenance of the hydraulic circuit.
Inspection and maintenance include checking the hydraulic system for oil level, replacement of filter elements
and replacement of hydraulic oil.
If high-pressure hoses have been removed, check that there is no damage to the O-rings. If any damage is found,
replace the O-ring.
It is necessary to bleed the air from the circuits when the hydraulic filter element or strainer have been replaced
or washed, or when hydraulic equipment has been repaired or replaced, or when the hydraulic piping has been
removed.
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MAINTENANCE
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