Komatsu PC300LC-8 Operation & Maintenance Manual page 168

OPERATION
Checks Before Starting
Always check the items in this section before starting the engine each day.
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 right rear cover on the machine and check that the
cooling water level is between the FULL and LOW marks on
radiator sub tank (1) (shown in the diagram on the right).
If the water level is low, add water through the water filler of sub
tank (1) to the FULL level.
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.
Drain Water And Sediment from Fuel Tank
1. Open the door at the right of the machine.
2. Set a container under the drain hose to catch the drained fuel.
3. Open drain valve (1) and drain the water and sediment
accumulated at the bottom together with the fuel.
4. When no more water and sediment comes out with the fuel,
close drain valve (1).
5. Close the door.
MACHINE OPERATIONS AND CONTROLS
WARNING
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