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MAINTENANCE
SERVICE PROCEDURE
WHEN REQUIRED
CLEAN INSIDE OF COOLING SYSTEM
WARNING
Immediately after the engine is stopped, the cooling water is at high temperature and the radiator is under high internal
pressure. If the radiator cap is removed in this condition and the water is drained, it may cause burns. To prevent this, wait
for the temperature to go down, then turn the cap slowly to release the internal pressure.
The cleaning operation is carried out with the engine running. When standing up from the operator's seat or leaving the cab,
set the parking brake lever and work equipment lock lever to the LOCK position.
For details when starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (PAGE 3-76)" and "STARTING ENGINE
(PAGE 3-95)".
When the engine is running, never come close to the fan at the front of the machine. There is danger of touching the fan.
When the engine is running, it is extremely dangerous to go under the machine during the cleaning operation. The machine
may move unexpectedly, so never go under the machine when the engine is running.
Stop the machine on level ground when cleaning or changing the coolant.
Clean the inside of the cooling system, change the coolant according to the table below.
Antifreeze coolant
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Precautions for use
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
1*
*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 resister, use Komatsu genuine corrosion resister. If you use another corrosion resister,
it may cause serious problems such as corrosion of the engine and parts of the cooling system that use light
metals such as aluminum.
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 parts of the cooling
system that use light metals such as aluminum.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
4 - 20
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