Komatsu SK820-5 turbo, Operation & Maintenance Manual

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PRECAUTIONS TO BE TAKEN DURING MAINTENANCE
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2.8.21 PRECAUTIONS TO BE TAKEN WHEN USING THE SYNTHETIC BIODE-
GRADABLE OIL TYPE «HEES»
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It is not possible to mix the synthetic biodegradable oil type HEES with ordinary hydraulic oils, since when the
temperature increases insoluble compounds are generated, which are deposited on the filters and clog them
(the maximum concentration of ordinary oil cannot exceed 1% of the total quantity of oil).
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The biodegradable oil can be used only in the hydraulic system; it cannot be used for the endothermic engine,
the transmissions, the braking system, etc.
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Before introducing the synthetic biodegradable oil in the hydraulic system, empty the system completely, discon-
necting the cylinders and all the parts that may contain ordinary oil, and replace the drain filter with a new one.
Start the engine and let it idle without using the work equipment , wait until the oil reaches a temperature of at le-
ast 40ºC, then start moving the equipment, so that all the parts of the system are filled with oil. Stop the engine
and check the oil level (see "4.8.2.e CHECKING THE OIL LEVEL IN THE HYDRAULIC CIRCUIT").