.
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.
Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set the lock lever to the LOCK
position.
For details of starting the engine, see"BEFORE STARTING ENGINE (PAGE 3-56)" and "STARTING ENGINE (PAGE 3-72)" in the
OPERATION section.
The engine is operated when washing, so it is dangerous if the machine moves when you are standing behind it. Never stand
behind the machine when the engine is running.
Clean the inside of the cooling system, change the coolant according to the table below.
Antifreeze coolant
Interval of cleaning inside of cooling system
and changing antifreeze coolant
Komatsu supercoolant
(AF-NAC)
Every two years or every 4000 hours
whichever comes first
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%.
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