.
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 3-69)" and "STARTING ENGINE (PAGE 3-87)" 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.
Coolant
Interval for cleaning inside of cooling system
and changing antifreeze coolant
Komatsu genuine
SUPERCOOLANT
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
Komatsu genuine SUPERCOOLANT (AF-NAC) 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 SUPERCOOLANT (AF-NAC). SUPERCOOLANT (AF-NAC) has excellent
anticorrosion, antifreeze and cooling properties and can be used continuously for two years or 4000 hours. As a
basic rule, we do not recommend the use of any COOLANT other than 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 COOLANT, always keep the density of COOLANT between 30% and
68%.
When selecting COOLANT, investigate the lowest temperature 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 about 10°C
(18°F) below lowest temperature. The density must be over 30% at least. If the density of obtained COOLANT is
higher than the necessary density for lowest temperature, dilute it with adequate distilled water, and then fill it into
the tank.
If there is any unclear point, please contact your Komatsu distributor.
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 - 26
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