METHOD FOR CLEANING INSIDE OF COOLING SYSTEM
WARNING
• Immediately after the engine is stopped, the coolant is still hot and the pressure is accumulated in
the radiator. If the cap is removed under this condition and the coolant is drained, it may cause
burns. Accordingly, wait until the coolant temperature drops, then turn the cap slowly to release the
pressure.
• Start the engine and clean the inside of the cooling system. When standing up or leaving the opera-
tor's seat, lock the parking brake lever and work equipment lock lever.
• For starting the engine, see “CHECKS AND ADJUSTMENT BEFORE STARTING ENGINE (3-140)” and
“METHOD FOR STARTING ENGINE (3-167)”.
• Never approach the fan at the front of the machine while the engine is running. There is a danger of
touching the fan.
• Entering under the machine for cleaning while the engine is running is very dangerous since the
machine may start suddenly. While the engine is running, never go under the machine.
Place the machine on a level ground when cleaning or changing the coolant.
Clean the inside of the cooling system, change the coolant according to the table.
Coolant
Cleaning of inside of cooling system and re-
placement of coolant
Non-Amine Engine Coolant
(AF-NAC)
Every 2 years or
4000 hours, whichever comes sooner
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 coolant is essential.
Komatsu machines are supplied with Non-Amine Engine Coolant (AF-NAC). Non-Amine Engine Coolant (AF-
NAC) has excellent anti-corrosion, antifreeze and cooling properties and can be used continuously for 2 years
or 4000 hours.
Komatsu recommends the use of Non-Amine Engine Coolant (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 anti-corrosion properties of Non-Amine Engine Coolant (AF-NAC), always keep the density of
Non-Amine Engine Coolant between 30 % and 64 %.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water. When using coolant, investigate the
lowest temperature in the past and decide the density for the coolant from the coolant density table below.
When deciding the density for the coolant, set it for a temperature 10 °C below the actual lowest temperature in
the working area.
The coolant density varies according to the ambient temperature, but it must be over 30 % at least.
Coolant density table
Min. atmospheric tem-
perature
°C
-10 or
above
-15 -20 -25 -30 -35 -40 -45 -50
Density (%) 30 36 41 46 50 54 58 61 64
MAINTENANCE MAINTENANCE PROCEDURE
4-21
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