Komatsu ecot3 WA430-6 Operation & Maintenance Manual page 256

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 3-118)" 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.
Antifreeze coolant
Komatsu supercoolant
(AF-NAC)
*1: When using Komatsu Supercoolant (AF-NAC), there is no need to use a corrosion resistor.
When no corrosion resistor is used, use the special cover (600-411-9000). Please consult your Komatsu
distributor about the method of installing.
When using corrosion resistor, use Komatsu genuine corrosion resistor. If you use another corrosion resistor,
it may cause serious problems such as corrosion of the engine and parts of the cooling system that use light
metals such as aluminum.
Stop the machine on level ground when cleaning or changing the coolant.
The coolant 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 Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
As a basic rule, we do not recommend the use of any coolant other than Komatsu genuine 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 Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
When deciding the proportions for mixing the coolant with water, investigate the lowest temperature in the past and
use the table below to decide the mixing ratio.
Actually, set a temperature that is 10°C (50°F) lower than the minimum temperature.
The mixing ratio differs according to the ambient temperature, but a minimum of 30% by volume is needed (amount
of antifreeze/total amount of water in cooling system x 100).
Even in areas where it is not necessary to prevent freezing, use Supercoolant (AF-NAC) at a mixing ratio of at least
30% to prevent corrosion of the cooling system.
The freezing temperature of 100% undiluted super coolant is -15°C (5°F). Be careful not to store the undiluted super
coolant at temperatures below -15°C (5°F).
WARNING
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Every two years or every 4000 hours
whichever comes first
SERVICE PROCEDURE
Precautions for use
1*
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