MAINTENANCE RECOMMENDED FUEL, COOLANT, AND LUBRICANT
4-13
Always use diesel oil for the fuel.
To ensure good fuel consumption characteristics and exhaust gas characteristics, the engine mounted on
this machine uses an electronically controlled high-pressure fuel injection device. This device requires
high precision parts and lubrication, so if low viscosity fuel with low lubricating ability is used, the durabil-
ity may drop markedly.
Note 1: HTHS ( High-Temperature High-Shear Viscosity 150°C), specified by ASTM D4741 must be equal to or
higher than 3.5 mPa-S. Komatsu EOS0W30 and EOS5W40 are the most suitable oils.
Note 2: Powertrain oil has different properties from engine oil. Be sure to use the recommended oils.
Note 3: If the machine is equipped with an auto-greasing system, see “HANDLING GREASE PUMP AND
GREASE GUN (3-141)“.
Note 4: Hyper grease (G2-T, G2-TE) has a high performance.
When it is necessary to improve the lubricating ability of the grease in order to prevent squeaking of pins and
bushings, the use of G2-T or G2-TE is recommended.
Note. 5: Coolant
1) <Komatsu genuine Supercoolant (AF-NAC) has the important function of anticorrosion as well as antifreeze.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Supercoolant (AF-NAC). Supercoolant (AF-NAC) has excellent anticorro-
sion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Supercoolant (AF-NAC) is strongly recommended wherever available.
2) For details of the density of the coolant, see “CLEAN INSIDE OF COOLING SYSTEM (4-27)“.
COOLANT is supplied already diluted. In this case, add the pre-diluted fluid to keep the tank full. (Never dilute the
COOLANT with ordinary water.)
3) To maintain the anticorrosion properties of coolant, always keep the density of coolant between 30% and 68%.
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS
OTHER THAN KOMATSU GENUINE OIL 4
When using commercially available oils other than Komatsu genuine oil, consult your Komatsu distributor.
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