ADAPTER 3L4431 - Caterpillar

Make sure you read and understand the information in the topics Safety and Cooling System Specifications for all information pertaining to water, antifreeze and supplemental coolant additive requirements before you proceed with maintenance of the cooling system.
Drain the coolant whenever the coolant is dirty or whenever foaming is observed.The radiator cap is located in the top of the hood.
Illustration 1 g00274750
Open the battery box. Use the cover as a step in order to attain access to the radiator filler cap. Maintain a three-point contact with the machine. (A three-point contact consists of two feet and one hand or of one foot and two hands.)
Slowly loosen the radiator cap in order to relieve system pressure. Remove the radiator cap.
Illustration 2 g00274761
The access plate for the drain hose is located at the rear of the machine under the bottom radiator guard. Remove the bolts and the access plate.
Illustration 3 g00274762
Pull the drain hose for the radiator from the opening.
The drain valve is under the radiator. Open the drain valve. Allow the coolant to drain into a suitable container.
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.
Start the engine. Run the engine for 90 minutes. Stop the engine. Drain the cleaning solution into a suitable container.
While the engine is stopped, flush the system with water. Flush the system until the draining water is clear.
Close the drain valve. Replace the drain hose and the access plate.
Add the coolant solution. See the following topics:
Operation and Maintenance Manual, "Cooling System Specifications"
Operation and Maintenance Manual, "Lubricant Viscosities"
Operation and Maintenance Manual, "Refill Capacities"Note: If you are using Caterpillar antifreeze, do not add the supplemental coolant additive at this time. Also, do not change the supplemental coolant additive element at this time.
Start the engine. Run the engine without the radiator cap until the thermostat opens and the coolant level stabilizes.
Maintain the coolant level within 13 mm (.5 inches) of the bottom of the filler pipe.
If the gasket is damaged, replace the radiator cap. Install the radiator cap.
Stop the engine.