MAINTENANCE PROCEDURE
178
WARNING
• Super coolant is flammable, so be particularly careful to keep it away from flame.
Super coolant is toxic. When removing the drain plug, be careful not to get coolant on yourself.
If it gets into your eyes, wash your eyes immediately with ample water, then consult a doctor for treat-
ment.
Always use Komatsu genuine super coolant (AF-NAC) for the coolant.
Use tap water to dilute the coolant. If river water or well water or simple water supply must be used, please consult
your Komatsu distributor.
We recommend the use of a super coolant density meter to control the mixing ratio.
Prepare a container with a capacity of at least 3.0 liters to catch the coolant.
• Prepare a water inlet hose.
1.
Open the engine rear cover and cooling cover. For de-
tails, see Section "3.2.10 COOLING COVER".
2.
Check that the cooling water temperature has gone down
enough to make it possible to touch the radiator cap sur-
face by hand, then turn radiator cap (1) slowly until it con-
tacts the stopper to release the pressure.
3.
Following this, push radiator cap (1), turn it until it contacts
the stopper, then remove it.
4.
Place a container to catch the coolant under the drain ho-
se installed to drain valve (2) and under coolant drain plug
(3) on the engine block.
5.
Open drain valve (2) and drain the water.
Remove drain plug (3) from the engine cylinder block and
drain the water.
6.
After draining the coolant, close the drain valve (2) and ti-
ghten the drain cap (3), then fill with drinking water. After
filling the radiator, start the engine and let it idle. When the
coolant temperature exceeds 90°C (194°F), let the engine
idle 10 minutes longer.
7.
Stop the engine, then open drain valve (2) and remove
drain plug (3) to drain the water.
8.
Close drain valve (2). Wind seal tapes onto drain plug (3),
then tighten it.
9.
Fill the radiator with Supercoolant and drinking water ac-
cording to the ratio indicated in the mixing table.
(For further details, see the "Water and antifreeze mixing
ratio" table on page 17
7
.)
10. To remove the air in the coolant, run the engine for 5 min-
utes at low idling, then for another 5 minutes at high idling.
(While doing this, leave the radiator cap removed).
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