HEAD 4T5612 - Caterpillar

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.
Do not change the coolant until you read and understand the material in the Cooling System Specifications section.
Mixing Cat Extended Life Coolant (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 Cat Extender with Cat ELC. Failure to follow these recommendations could result in damage to the cooling systems components.If ELC cooling system contamination occurs, refer to Operation and Maintenance, "Extended Life Coolant (ELC)" under the topic ELC Cooling System Contamination.This machine was factory filled with Cat Extended Life Coolant.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Reference: If the coolant in the machine is changed to Extended Life Coolant from another type of coolant, refer to Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations".If the coolant is dirty or if you observe any foaming in the cooling system, change the coolant before the recommended interval.It is important to replace the water temperature regulator in order to avoid any unexpected failure of the water temperature regulator. This is a good preventive maintenance practice that reduces the chances of unscheduled downtime. Failure to replace the water temperature regulator on a regularly scheduled basis could cause severe engine damage.Note: If you are only replacing the water temperature regulator, drain the coolant from the cooling system so that the level of the coolant is below the housing for the water temperature regulator.Always operate Caterpillar engines with a water temperature regulator because these engines have a shunt design cooling system.Note: Water temperature regulators can be reused if the water temperature regulators meet certain test specifications. The tested water temperature regulators must not be damaged and the tested water temperature regulators must not have an excessive buildup of deposits.
Stop the engine. Allow the radiator to cool sufficiently.
Illustration 1 g02549985
Illustration 2 g01139174
Open the access doors on the top of the radiator guard at the rear of the machine. Slowly remove cooling system pressure caps (2) in order to relieve system pressure.
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View of underside