Komatsu D375A-8, Operation & Maintenance Manual

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3.
Place the containers to catch the mixed water with coolant
under the drain valve (4) at the bottom of the radiator and
under the drain valve (5) at the bottom of the oil cooler.
4.
Open the drain valves (4) and (5) to drain the coolant.
Remove the cover (6) before opening the drain valve (5).
5.
After draining the coolant, close the drain valves (4) and
(5) and fill with city water.
Pour the water until it fills the radiator.
6.
Start the engine.
7.
Run the engine at low idle for approximately 10 minutes.
8.
Stop the engine and open the drain valves (4) and (5) to
drain the water.
9.
After draining the water, clean with detergent liquid.
For the cleaning method, follow the instruction of the deter-
gent liquid.
10. Close the drain valves (4) and (5).
11. Add the Non-Amine Engine Coolant (AF-NAC) through the
radiator water filler port up to the mouth of the port.
For the concentration of Non-Amine Engine Coolant (AF-
NAC), see “Coolant density table”.
12. Run the engine at low idle for 5 minutes to remove the air
from the coolant, then run at high idle for a further 5 mi-
nutes.
At this time, keep the radiator cap removed.
13. Stop the engine, wait for approximately 3 minutes, add
coolant up to the mouth of the filler port, and tighten the ra-
diator cap (3).
Add all the specified volume of Non-Amine Engine Coolant
(AF-NAC).
If the refilled coolant amount is below the specified vol-
ume, the air bleeding from the coolant is insufficient.
Start the engine and perform the air bleeding again by referring to the steps 11 and 12.
14. Open the cap (7) of coolant reservoir tank, and add the
coolant up to the specified level by referring to “METHOD
FOR CHECKING COOLANT LEVEL, ADDING COOL-
ANT”.
MAINTENANCE PROCEDURE MAINTENANCE
4-22