MAINTENANCE NOTES
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4.2.2 NOTES ON THE MAINTENANCE OF THE ELECTRICAL SYSTEM
q If the cables are wet or their insulating material is damaged, the electrical system leaks and this may result in
malfunctions of the machine.
q The maintenance operations required for the electrical system are the following:
1 - Check of the alternator belt tension.
2 - Check of the alternator belt for damage or breakages.
3 - Check of the battery charge level.
q Do not remove or eliminate any electric component installed on the machine and do not install any electric
component with characteristics different from those specified and approved by Komatsu.
q Keep the electric system dry.
q When working on the seashore or on river or lake banks, protect the jack plugs from corrosion.
q Do not connect any optional device to the fuses, ignition switch, battery, relays, etc.; for the installation of any
optional equipment, contact your Komatsu Dealer.
q If any electric welding operation has to be carried out, disconnect the battery and the alternator.
4.2.3 NOTES ON THE MAINTENANCE OF THE HYDRAULIC SYSTEM
q Be extremely careful when performing maintenance operations on the hydraulic system, since soon after work
the oil is very hot. The circuit is pressurized not only during work, but also at the end of work.
q The maintenance operations required for the hydraulic system are the following:
1 - Daily check of the oil level in the tank.
2 - Periodical change of the oil filter.
3 - Periodical change of the oil and cleaning of the intake filter.
q Always bleed the circuit after changing the oil filter or the oil.
q When a component is removed from the circuit, check the gaskets and O rings and change them if they are
damaged.
q When a cylinder or a component of the hydraulic circuit is removed, after reassembly bleed the circuit by
proceeding as follows:
1 - Start the engine and let it idle.
2 - Extend all the cylinders 4-5 times, stopping them at approx. 100 mm from the end of stroke.
3 - Slowly make all the cylinders reach the end of stroke for 3-4 times.
4.2.4 MAINTENANCE NOTES REGARDING LUBRICATION
q Lubrication makes the operations carried out with the machine and work equipment smoother, while preventing
wear and the noise that may be produced if the joints are dry.
Lubricate with grease or oil.
q The maintenance operations required for the components that need lubricating are the following:
1 - Check of the levels.
2 - Oil change.
3 - Injection of grease through the grease nipples.
q Use only the specified lubricants, according to the ambient temperature.
q Always clean the grease nipples before injecting grease and remove any excess grease after lubrication; this
cleaning operation must be performed with extreme care on the revolving parts.
q Maintain correct lubricant levels, avoiding excessive or insufficient quantities.
