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MAINTENANCE
MAINTENANCE PROCEDURE
CLEAN INSIDE OF COOLING SYSTEM
WARNING
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.
When starting the engine while cleaning the machine, set the lock lever in the lock position to prevent the machine from
moving.
For details of starting the engine, see "BEFORE STARTING ENGINE (PAGE 3-111)" and "STARTING ENGINE (PAGE 3-131)" in
the OPERATION section.
There is danger of touching the fan if the undercover is left removed.
Never enter behind 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
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
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%.
Supercoolant (AF-NAC) is already diluted with distilled water. When using coolant, investigate the lowest
temperatures 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 for a temperature 10°C (18°F) lbelow the actual
temperature.
The coolant density varies according to the ambient temperature, but it must always be a minimum of 30%.
Coolant density table
Minimum Temp
°
C Above -10 -15 -20 -25 -30 -35 -40 -45 -50
°
F Above 14 5 -4 -13 -22 -31 -40 -49 -58
Concentration (%) 30 3641465054586164
4 - 25
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