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MAINTENANCE
SERVICE PROCEDURE
CLEAN INSIDE OF COOLING SYSTEM
WARNING
Immediately after the engine is stopped, the engine coolant is hot and the pressure inside the radiator is high. Removing the
cap and draining the water under this condition could cause burns. Allow the engine to cool down, then turn the cap slowly to
release the pressure.
Start the engine and flush the system. Before standing up or leaving the operator's seat, set the work equipment lock lever to
the LOCK position.
For details of starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (PAGE 3-90)" and "STARTING ENGINE
(PAGE 3-106)" in the OPERATION section of the Operation and Maintenance Manual.
When the undercover is removed, there is danger of touching the fan.
Never enter the rear of the machine when the engine is running.
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the table
below.
Antifreeze coolant
Interval of cleaning inside of cooling system
and changing antifreeze coolant
Replacing corrosion resistor
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
Every 1000 hours
and when cleaning the inside
of the cooling system
and when changing coolant.
Permanent type antifreeze
(All-season type, *)
Every year (autumn) or every 2000 hours
whichever comes first.
*: Permanent type antifreeze shall meet the requirements of ASTM D3306-03.
Stop the machine on level ground when cleaning or changing the coolant.
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.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
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).
The freezing temperature of undiluted antifreeze is -15°C(5°F). Do not store undiluted antifreeze at a temperature
of below -15°C(5°F).
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