However, when working in severe conditions, replace the filters at shorter intervals according to the oil and
fuel (sulphur 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
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WARNING
• 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 (3-111)”.
• 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. 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.
• Komatsu recommends installing electric components 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 on the seashore, carefully clean the electric system 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. In addition, high pressure is
applied to the hydraulic system, thus pay attention to the following matters when performing inspection and
maintenance of it.
• Lower the work equipment to the ground on a level place, and work so that no pressure is applied to
the cylinder circuits.
• Be sure to stop the engine.
• Since the hydraulic oil and lubricating oil are at high temperature and high pressure just after operation,
wait until the oil temperature at each part decreases, and then start 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, be sure to release air from the
hydraulic tank to release the internal pressure.
• The inspection and maintenance include check of the hydraulic oil level, replacement of filters, replacement
of the hydraulic oil.
• When the high-pressure hoses, etc. are disconnected, check the O-rings for damage. If they are damaged,
replace them.
MAINTENANCE
OUTLINE OF MAINTENANCE
4-9
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