320D3 Excavators Caterpillar

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Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns. Remove cooling system pressure cap slowly to relieve pressure only when engine is stopped and cooling system pressure cap is cool enough to touch with your bare hand. Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns. Cooling System Coolant Additive contains alkali. Avoid contact with skin and eyes.

Note: This machine was filled at the factory with Caterpillar Extended Life Coolant.

If the coolant in the machine is changed to Extended Life Coolant from another type of coolant, see Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations".

1. Unlatch the engine hood and raise the engine hood.
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   Illustration 1	g00544510

2. Slowly loosen the pressure cap that is on the radiator in order to release pressure from the cooling system.

3. Remove the pressure cap.
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   Illustration 2	g00544378

   Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to containing fluid spillage.

4. Remove the access cover that is underneath the radiator.
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   Illustration 3	g06321158

5. Open the drain valve and allow the coolant to drain into a suitable container. The drain valve is located on the bottom of the radiator.

6. Flush the cooling system. Follow Step 6.a through Step 6.h in order to properly flush the cooling system.

   1. Close the drain valve.

   2. Fill the cooling system with clean water.

   3. Install the pressure cap.

   4. Start the engine and run the engine until the engine reaches operating temperature.

   5. Stop the engine and allow the engine to cool.

   6. Loosen the pressure cap slowly in order to relieve any pressure in the cooling system.

   7. Open the drain valve that is underneath the radiator and allow the coolant to drain into a suitable container.

   8. Flush the radiator with clean water until the draining water is transparent.

7. Close the drain valve and install the access cover underneath the radiator.

8. Add the Extended Life Coolant. Refer to the following topics:

   • Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations"

   • Operation and Maintenance Manual, "Capacities (Refill)"

9. Start the engine. Operate the engine without the cooling system pressure cap until the water temperature regulator opens and the coolant level stabilizes.

10. Maintain the coolant level within 13 mm (.5 inches) of the bottom of the filler pipe.

11. Inspect the gasket of the cooling system pressure cap. If the gasket is damaged, replace the pressure cap.

12. Install the cooling system pressure cap.

13. Stop the engine.

14. Open the left access door.
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    Illustration 4	g00545226
    (1) "FULL" (2) "LOW"

15. Check the coolant reservoir. Maintain the coolant level between "FULL" mark (1) and "LOW" mark (2).

16. If additional coolant is necessary, remove the reservoir cap and add the appropriate coolant solution.

17. Install the reservoir cap.

18. Close the engine hood and latch the engine hood. Close the left access door.