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4.4 Use fuel, coolant and lubricants according to ambient temperature
NOTE
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 durability
may drop markedly.
Note 1:
HTHS (High-Temperature High-Shear Viscosity 150°C), speci-
fied 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:
Hypergrease (G2-T, G2-TE) is high-performance grease.
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 3:
Supercoolant (AF-NAC)
1. The coolant has the important function of preventing corro-
sion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of
antifreeze coolant is essential.
KOMATSU machines are supplied with KOMATSU Super-
coolant (AF-NAC). KOMATSU Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties
and can be used continuously for 2 years or 4000 hours.
KOMATSU Supercoolant (AF-NAC) is strongly recom-
mended wherever available.
2. For details of the ratio when diluting super coolant with
water, see "Clean inside of cooling system (4-39)".
Supercoolant AF-NAC may be supplied in premix. In this
case, always top off with premix solution (never dilute with
water).
When the machine is shipped from the factory, it may be
filled with coolant containing 30% or more Supercoolant (AF-
NAC). In this case, no adjustment is needed for tempera-
tures down to -10°C (never dilute with water).
3. To maintain the anticorrosion properties of Supercoolant
(AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
4-18
Maintenance
PW180-7E0 – VEAM400102
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