RECOMMENDED FUEL, COOLANT, AND LUBRICANT MAINTENANCE
4-14
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. If these oils are not avail-
able, follow the instruction “RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER
THAN KOMATSU GENUINE OIL (4-14)“ at the end of this chapter.
Note 2: Powertrain oil has different properties from engine oil. Be sure to use the recommended oils.
Note 3: 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 4: Supercoolant (AF-NAC)
1) Coolant 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 Komatsu Supercoolant AF-NAC. Komatsu Supercoolant AF-NAC has excel-
lent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant AF-NAC is strongly recommended wherever available.
2) For details of the ratio when diluting super coolant with water, see “CLEAN INSIDE OF COOLING SYSTEM (4-
28)“.
Supercoolant AF-NAC may be supplied in premix. In this case, always top off with premix solution. (never dilute
with water)
3) To maintain the anticorrosion properties of Supercoolant AF-NAC, always keep the density of Supercoolant
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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