Komatsu PC220LC -8 Operation & Maintenance Manual page 173

MACHINE OPERATIONS AND CONTROLS
Check Coolant Level, Add Coolant
Do not open the radiator cap unless necessary. When checking the coolant, always wait for the engine to cool down and check
the sub tank.
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 check the coolant level 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 and remove it carefully.
1. Open the door at the rear left of the machine, and check if the
coolant in sub-tank (1) (shown in the diagram on the right) is
between the FULL and LOW marks. If the coolant level is low,
add coolant to the FULL level through the filler port of sub-tank
(1).
2. After adding coolant, tighten the cap securely.
3. If the sub-tank becomes empty, there is probably water
leakage. After checking, repair any abnormality immediately. It
no abnormality is found, check the level of the water in the
radiator. If it is low, add Supercoolant (AF-NAC) of the same
density as the Supercoolant in the radiator, then add
Supercoolant to the sub-tank.
4. If the inside of sub-tank (1) is dirty and the water level cannot
be seen, use the procedure in "CLEAN INSIDE OF COOLING
SYSTEM (PAGE 4-27)".
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WARNING
OPERATION