Clean Inside Of Cooling System - Komatsu WA380-6 Operation & Maintenance Manual

MAINTENANCE

CLEAN INSIDE OF COOLING SYSTEM

Immediately after the engine is stopped, the engine coolant is hot and the pressure inside the radiator is high. Removing the
cap and draining the water under this condition could cause burns. Allow the engine to cool down, then turn the cap slowly
to release the pressure.
Start the engine and flush the system. Before standing up or leaving the operator's seat, set the work equipment lock lever to
the LOCK position.
For details of starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (PAGE 3-99)" and "STARTING ENGINE
(PAGE 3-119)" in the OPERATION section of the Operation and Maintenance Manual.
When the undercover is removed, there is danger of touching the fan.
Never enter the rear of the machine when the engine is running.
Clean the inside of the cooling system, change the coolant according to the table below.
Coolant
Komatsu genuine
SUPERCOOLANT
(AF-NAC)
Stop the machine on level ground when cleaning or changing the coolant.
Komatsu genuine SUPERCOOLANT (AF-NAC) has the important function of preventing corrosion 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 SUPERCOOLANT (AF-NAC). SUPERCOOLANT (AF-NAC) has excellent
anticorrosion, antifreeze and cooling properties and can be used continuously for two years or 4000 hours. As a
basic rule, we do not recommend the use of any COOLANT other than SUPERCOOLANT (AF-NAC). If you use
another COOLANT, it may cause serious problems, such as corrosion of the engine and aluminum parts of the
cooling system.
To maintain the anticorrosion properties of COOLANT, always keep the density of COOLANT between 30% and
68%.
When selecting COOLANT, investigate the lowest temperature in the past and decide the density for the COOLANT
from the COOLANT density table below. When actually deciding the density for the COOLANT, set it about 10°C
(18°F) below lowest temperature. The density must be over 30% at least. If the density of obtained COOLANT is
higher than the necessary density for lowest temperature, dilute it with adequate distilled water, and then fill it into
the tank.
If there is any unclear point, please contact your Komatsu distributor.
WARNING
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Every two years or every 4000 hours
whichever comes first
SERVICE PROCEDURE
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