Komatsu WB93R-5, Operation & Maintenance Manual

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GUIDE TO MAINTENANCE
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4.1 GUIDE TO MAINTENANCE
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Before opening the engine hood, engage the safety locks of both the front loader and the backhoe.
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If it is necessary to check the hydraulic oil level in the tank, set the machine in transport position (see "3.1 SAFE-
TY LOCKS").
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Carry out any maintenance operation on firm and level ground, after applying the parking brake.
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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 and prevent any foreign matter from get-
ting into them.
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Always keep the machine clean: this makes it easier to locate any failed part.
In particular, clean the grease nipples, the breathers and the areas near the openings for the level checks, to
prevent any impurities from getting into/on them.
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Draining hot oil or coolant immediately after stopping the engine is hazardous. Wait for the engine to cool down
until reaching a temperature of at least 40–50° C.
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When changing the oil or the filters, check for metal particles. If you find large quantities of metal particles, con-
tact your Komatsu Dealer.
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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, the control levers
and the cab doors, to prevent anyone from starting the engine.
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When performing maintenance operations, always take the precautions indicated on the safety plates applied to
the machine.
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Instructions for arc welding:
1 - Turn the ignition key to position «O».
2 - Disconnect the battery (first the negative pole and then the positive pole).
3 - Disconnect the alternator.
4 - Do not apply more than 200V continuously.
5 - Connect the earth cable within 1 m from the point where the welding operation must be carried out.
6 - Avoid placing gaskets and bearings between the welding area and the earth cable.
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Do not use flammable fluids to clean any parts of the machine. Keep naked flames away from these fluids and
avoid smoking.
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When O rings and gaskets are removed, clean the sealing surfaces thoroughly and replace the O rings and gas-
kets with new ones.
Fit the O rings and gaskets correctly when reassembling.
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Avoid keeping loose objects or tools in your pockets: they may fall out and drop into the machine, especially
when you open covers and work on the machine while bending over it.
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When washing the machine, do not direct the high-pressure water jet onto 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, provide for lubrication where required.
Wash the machine immediately after work to protect the components from rust. Lubricate the equipment joints
more frequently than usual.
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When the worksite is particularly dusty, proceed as follows:
1 - Check the air filter 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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