STEP AS 1342552 - Caterpillar

Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Do not change the coolant until you read and understand the cooling system information in Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations".Failure to do so could result in damage to the cooling system components.
Mixing ELC with other products reduces the effectiveness of the coolant and shortens coolant life. Use only Caterpillar products or commercial products that have passed the Caterpillar EC-1 specifications for premixed or concentrate coolants. Use only Caterpillar Extender with Caterpillar ELC. Failure to follow these recommendations could result in the damage to cooling systems components.If ELC cooling system contamination occurs see the topic Extended Life Coolant (ELC) in the Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations".
Note: This procedure pertains to machines using Extended life Coolant (ELC) only.If the coolant is dirty or if you observe any foaming in the cooling system, drain the coolant before the recommended interval.
Illustration 1 g01244495
Loosen the pressure cap slowly to relieve cooling system pressure. Remove the pressure cap.
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Remove the crankcase bottom guard.
Open the drain valve for the engine cooling system. Drain the coolant into a suitable container. The drain valve is located on the transmission oil cooler.
Close the drain valve. Fill the system with clean water and a 6 to 10 percent concentration of cooling system cleaner.
Start and run the engine for 90 minutes. Stop the engine and drain the cleaning solution into a suitable container.
When the engine is stopped, flush the cooling system with water until the draining water is clear. Drain the water into a suitable container.
Close the drain valve.
Add the coolant solution. Add coolant slowly to help avoid air locks, 20 L (5 US gal) per minute.ReferenceFor additional information on the cooling system capacity, refer to the Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the machine that is being serviced.
Start the engine. Run the engine with the cooling system pressure cap removed. Run the engine until the water temperature regulator opens and the coolant level stabilizes.
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Maintain the coolant level to within 13 mm (0.50 inch) of the bottom of the filler pipe or to the proper level in the sight gauge.
Install the cooling system pressure cap.
Stop the engine.