374D Excavator Cooling System Coolant Level - Check Caterpillar

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Illustration 2	g02138410

1. Open the access cover (3) for the cooling system pressure cap (4). The access cover for the cooling system pressure cap is located on top of the machine above the left rear access door. Remove bolt (1) and loosen bolt (2). Slide the access cover open.

2. Slowly loosen the cooling system pressure cap in order to relieve system pressure. Remove the pressure cap.

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

3. Add the appropriate coolant solution to the cooling system. Refer to the following topics:

   • Operation and Maintenance Manual, SEBU6250, "Cooling System Specifications"

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

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

5. Maintain the coolant level within 13 mm (0.5 inch) of the bottom of the filler pipe.
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   Illustration 3	g00102170

6. Inspect the condition of the gasket on the pressure cap. If the gasket is damaged, replace the pressure cap.

7. Install the cooling system pressure cap.

8. Stop the engine.

9. Close the access cover for the cooling system pressure cap. Install and tighten bolts (1) and (2).

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