Komatsu PC138US-11 Operation & Maintenance Manual page 335

MAINTENANCE
Coolant density table
Min. atmospheric tem-
perature
Density (%)
• 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.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable. (For dilution
water, see "HANDLE OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC (4-4)".)
Check the density with a coolant tester.
Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Prepare a hose to fill with coolant and water.
1.
Stop the engine.
2.
Remove the cover mounting bolt (2) (4 places) and re-
move the undercover (1).
3.
Remove the cover mounting bolt (3) (4 places) and re-
move the cover (4) between the hydraulic tank and opera-
tor cab.
4.
Check that the coolant temperature is low enough to touch
the radiator cap surface by bare hand, turn radiator cap (5)
slowly until it hits the stopper, and release the pressure.
5.
Then, while pushing radiator cap (5), turn it until it touches
the stopper, and remove it.
°C Min. -10 -15
30 36
WARNING
k
WENAM00111
-20 -25 -30
41 46 50
MAINTENANCE PROCEDURE
-35 -40 -45
54 58 61
-50
64
4-19