Komatsu Utility WB97S-5, Operation & Maintenance Manual

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MAINTENANCE NOTES
167
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Use only red permanent ethylene glycol based antifreeze, with corrosion inhibitors and antifoam products,
suitable for aluminium radiators. If pure, dilute with water (50%).
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The use of permanent antifreeze requires only the check of the level and the periodical change of the fluid. It is
not necessary to wash the cooling circuit.
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Use drinkable water and in any case soft water.
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Do not use corrosion inhibitors containing soluble oil, since they damage the rubber couplings.
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In case of doubt regarding the applicable standards for the use of antifreeze, contact your Komatsu Dealer, who
will supply you with exhaustive and precise information.
4.2.1.3 FUEL
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Always use fuel suitable for the engine. Other fuels with different specifications may damage the engine or
reduce its power.
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Always refuel at the end of work.
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When refuelling, make sure that there is no water on the fuel drum cover and take care not to draw condensate
from the drum bottom.
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If fuel runs out, or if the fuel filter has been replaced, it is necessary to bleed the circuit.
4.2.2 NOTES REGARDING THE HYDRAULIC SYSTEM
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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.
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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.
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Always bleed the circuit after changing the oil filter or the oil.
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When a component is removed from the circuit, check the gaskets and O rings and change them if they are
damaged.
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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.
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