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MAINTENANCE
WHEN REQUIRED
CLEAN INSIDE OF COOLING SYSTEM
Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure.
If the cap is removed to drain the coolant in this condition, there is a hazard of burns. Wait for the temperature to go down, then
turn the cap slowly to release the pressure before removing it.
Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set the work equipment lock
lever and the parking lever to the LOCK position.
For details of starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (PAGE 3-95)" and "STARTING ENGINE
(PAGE 3-116)" in the OPERATION section.
Never walk in front of the machine when the engine is running.There is danger of touching the fan.
It is extremely dangerous to go under the machine to clean it when the engine is running. There is danger that the machine may
suddenly move. 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
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.
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%.
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mixing
table given below.
It is actually better to estimate and temperature about 10°C (18°F) lower when deciding the mixing ratio.
The mixing ratio depends on the ambient temperature, but it should always be a minimum of 30% by volume
(antifreeze/total amount of coolant 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.
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*
4 - 21
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