Komatsu PC700LC-11, Operation & Maintenance Manual

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Komatsu recommends the use of Non-Amine Engine Coolant (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 anti-corrosion properties of Non-Amine Engine Coolant (AF-NAC), always keep the density of
Non-Amine Engine Coolant between 30% and 64%.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water. When using the coolant, investigate
the lowest temperature in the past and decide the density for the coolant from the coolant density table below.
When deciding the density for the coolant, set it for a temperature 10 °C below the actual lowest temperature in
the working area.
The coolant density varies according to the ambient temperature, but it must be over 30% at least.
Coolant density table
Min. atmospheric tem-
perature
°C
-10 or
more
-15 -20 -25 -30 -35 -40 -45 -50
Density (%) 30 36 41 46 50 54 58 61 64
k k
WARNING
• Coolant is toxic. When opening the drain valve, be careful not to get coolant on you. If it gets in
your eyes, flush your eyes with large amount of fresh water and see a doctor immediately.
• When handling the cooling water containing coolant that has been drained during changing the
coolant or repairing the radiator, contact your Komatsu distributor or request a qualified company
to perform the operation. Coolant is toxic, so never pour it into drainage ditches or drain it onto the
ground surface.
NOTICE
Komatsu recommends using genuine Non-Amine Engine Coolant (AF-NAC) for the coolant.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable.
Check the density with a coolant tester.
Prepare a container whose capacity is larger than the specified coolant volume to catch the drained coolant.
Clean the inside of the cooling system according to the following procedure.
1.
Place the machine on a level ground, then stop the engine.
2.
Remove the bolt, remove the cover (1), and check that the
coolant temperature is low enough to touch the radiator
cap surface by bare hand, turn the radiator cap (2) slowly
until it hits the stopper, and release the pressure.
3.
While pushing the radiator cap (2), turn it until it hits the
stopper, then remove it.
4.
Remove the covers (3), (4), (5), and set the containers un-
der the coolant drain valves (6) and (7) on the lower side
of the radiator and the engine coolant drain valve (8) on
the upper side of the engine oil pan, to receive the coolant
mixture.
5.
Open the drain valves (6), (7), and (8) to drain the coolant.
6.
After the coolant is drained, add the tap water. After the radiator is filled with water, start the engine, run it at
low idle, raise the water temperature to 90 °C or higher, and run the engine for approximately 10 minutes.
MAINTENANCE PROCEDURE MAINTENANCE
4-22