Komatsu WA100M-7, Operation And Maintenance Manual

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5.8 Maintenance procedure
Corrective maintenance Maintenance
5-32
WA80M-7, WA100M-7 – VENAM03001
Cooling system – cleaning internal area of the cooling system
WARNING
 Danger of scalding! The coolant is pressurised while the
engine is hot. Hot coolant may spurt out when the cooling sys-
tem is opened.
 Wait until the engine has cooled down before checking the
coolant level. Slowly unscrew the cap (arrow) to let the pres-
sure escape.
Clean the inside of the cooling system and change the coolant
according to the table below.
Park the machine on solid, level ground before cleaning the cool-
ing system or changing the coolant.
The important task of the coolant is to prevent corrosion and offer
frost protection.
It is essential to use antifreeze even in areas where there is no
risk of frost.
Komatsu machines are supplied with amine-free engine coolant
(AF-NAC). The amine-free engine coolant (AF-NAC) has excel-
lent anti-corrosion, antifreeze and cooling properties, and can be
used continuously for two years or 4000 hours.
Komatsu recommends using a amine-free engine coolant (AF-
NAC). If you use a different coolant, this can lead to serious prob-
lems such as corrosion in the engine and aluminium parts of the
cooling system.
In order to maintain the anti-corrosion properties of the amine-
free engine coolant (AF-NAC), keep the density of the amine-free
engine coolant between 30 % and 64% at all times.
The amine-free engine coolant (AF-NAC) is already diluted with
distilled water. With regard to using the coolant, check what was
the lowest temperature recorded in the past and then decide
according to the mixing table below which coolant density is
required.
When you are deciding on the density of the coolant, determine
it for a temperature of 10 °C below the actual temperature.
The coolant density changes depending on the ambient temper-
ature, but it must always be at least 30%.
Coolant/antifreeze
Interval for cleaning the inside of the cooling system
and changing the coolant
Komatsu Supercoolant
(AF-NAC)
Every two years or every 4000 service hours,
whichever is earlier.