561M Pipelayer Cooling System Coolant (DEAC) - Change Caterpillar

Cooling System Coolant (DEAC) - Change

------ WARNING! ------

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.



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, "AVSpare Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.

Drain the coolant whenever the coolant is dirty or whenever foaming is observed.

The radiator cap is positioned under the access door in the top of the hood.

Illustration 1g00101147

  1. Slowly loosen the radiator cap in order to relieve system pressure. Remove the radiator cap.

    Illustration 2g00101156

  1. The drain valve is under the radiator. Open the drain valve. Allow the coolant to drain into a suitable container.

  1. Close the drain valve. Fill the system with a solution which consists of clean water and of cooling system cleaner. The concentration of the cooling system cleaner should be 6 to 10 percent.

  1. Start the engine. Run the engine for 90 minutes. Stop the engine. Drain the cleaning solution into a suitable container.

  1. While the engine is stopped, flush the system with water. Flush the system until the draining water is clear.

  1. Close the drain valve.

  1. Add the coolant solution. See the following topics:

    • This Operation and Maintenance Manual, "Refill Capacities"

    • Cooling System Specifications section in Operation and Maintenance Manual, SEBU6250

    Note: If you are using AVSpare antifreeze, do not add the supplemental coolant additive at this time. Also, do not change the supplemental coolant additive element at this time.

  1. Start the engine. Run the engine without the radiator cap until the thermostat opens and the coolant level stabilizes.

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

  1. If the gasket is damaged, replace the radiator cap. Install the radiator cap.

  1. Stop the engine.