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MAINTENANCE
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 and use again the filters (cartridge type). Always replace them with new filters.
•
When replacing oil filters, check if any metal particles are attached to the old filters.
If any metal particles are found, consult your Komatsu distributor.
•
Do not open packages of spare filters until just before they are to be used.
•
Komatsu recommends using Komatsu genuine filters.
HANDLE ELECTRICAL COMPONENTS
•
When the battery disconnect switch key is turned to OFF position for the maintenance work, always
pull out the key and keep it with you. If the key is left in the switch, someone may turn ON the power
by mistake. It is dangerous that causes an electric shock.
For the operation of the battery disconnect switch, see "BATTERY DISCONNECT SWITCH (3-101)".
•
It is extremely dangerous if the electrical component becomes wet or the covering of the wiring is
damaged. This will cause an 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 components.
•
When removing the connectors of electrical components after washing the machine or in the rain, wipe off
the water drop stuck around connectors before removing the connectors and keep the water drop away
from inside of the connectors.
•
Checking and maintenance items are checking fan belt tension, checking damage of the fan belt and
checking battery fluid level.
•
Never install any electrical components other than those specified by Komatsu.
•
External electro-magnetic interference may cause malfunction of the control system controller. Accordingly,
consult your Komatsu distributor before installing a radio receiver or other wireless equipment to the ma-
chine.
•
When working at the seashore, keep the electrical component clean to prevent corrosion.
•
When installing electrical component, connect it to the special power supply connector.
Do not connect the optional power supply to the fuse or starting switch or battery relay, etc.
HANDLE HYDRAULIC COMPONENTS
•
The hydraulic system is at high temperature during and just after operation. During operations, it is also un-
der high pressure, so when performing inspection and maintenance of hydraulic related equipment, be
careful of the following points.
•
Stop the machine on a flat ground, lower the work equipment to the ground, and perform the work so
that there is no pressure on the cylinder circuits.
•
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 oil temperature to go down before starting maintenance.
Internal pressure may be high even after the temperature decreases.
When loosening a plug, screw, or hose, avoid standing in front of them and loosen gradually and re-
lease the internal pressure, and then remove.
•
When performing inspection and maintenance of the hydraulic circuit, always release the air in the hy-
draulic tank to remove the internal pressure by referring to "METHOD FOR RELEASING PRESSURE
IN HYDRAULIC CIRCUIT (4-66)".
•
The inspection and maintenance include check of the hydraulic oil level, replacement of filters, replacement
of the hydraulic oil.
•
When high-pressure hoses have been removed, check that there is no damage to O-rings. If any damage is
found, replace O-ring.
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WARNING
OUTLINE OF MAINTENANCE
4-9
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