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GUIDE TO MAINTENANCE
4.1 GUIDE TO MAINTENANCE
Before opening the engine hood, engage all the safety devices and stop the engine.
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If it is necessary to check the hydraulic oil level, lower the arm and rest the bucket on to the ground.
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Carry out any operation on firm and level ground, applying the parking brake.
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Raise the cab taking all the precautions indicated in "3.5.3.1 RAISING THE CAB".
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Use Komatsu genuine oils and greases; choose oils suitable for the ambient temperature.
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Use clean oils and greases. Keep the oil and grease containers clean. Keep any foreign matter away from oils
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and greases.
Always keep the machine clean. This makes it easier to find out any part causing troubles.
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In particular, keep the grease nipples, the breathers and the areas near the openings for the level checks clean
and prevent any impurities from getting into/on them.
Draining hot oil or coolant immediately after stopping the engine is hazardous. Wait for the engine to cool down
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until reaching at least 40÷50º C.
When changing the oils and the filters, check if metal particles are present. If you find large quantities of metal
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particles, contact your Komatsu Dealer.
Check and change the oil in a clean place and prevent any impurities from getting into the tank.
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Before carrying out any maintenance operation, hang warning plates on the ignition switch and the control le-
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vers, in order to prevent anyone from starting the engine by mistake.
When performing maintenance operations, always take the precautions indicated in the safety plates applied on
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to the machine.
Instructions for arc welding:
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1 - Turn the ignition key to position « ».
2 - Disconnect the battery (first the negative pole and then the positive pole).
3 - Disconnect the alternator.
4 - Do not apply more than 200 V continuously.
5 - Connect the earth cable within 1 m from the point in which the welding must be carried out.
6 - Avoid placing gaskets and bearings between the welding area and the earth cable.
Do not use flammable fluids to clean the machine parts. Keep naked flames or lit cigarettes away from these flui-
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ds.
When O-rings and gaskets are removed, clean the sealing surfaces thoroughly and replace the O-rings and
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gaskets with new ones.
Fit the O-rings and gaskets correctly when reassembling.
Avoid keeping loose objects or tools in your pockets: they may fall out and drop into the machine when you work
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on the machine while bending over it.
When washing the machine, do not direct the high-pressure water jet on to the radiator and the heat exchanger.
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When washing the machine, protect the electric system connectors and avoid wetting the ignition switch.
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Before starting work in mud, under the rain, on seashores or river banks, carry out a general lubrication.
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Wash the machine immediately after work to protect the components from rust. Lubricate the equipment joints
more frequently than usual.
When working at dusty work sites, proceed as follows:
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1 - Check the air cleaner for any clogging and clean it more frequently than usual.
2 - Clean the radiator and the heat exchanger frequently, to avoid any clogging of the fins.
3 - Change the diesel oil filter more frequently than usual.
4 - Clean the electrical components, especially the starter and the alternator, to avoid any accumulation of dust.
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