This article mainly introduces Caterpillar 426 Cooling System Coolant
(DEAC)-Change
AWARNING Pressurized system: Hot coolant can cause seri-
ous burn. To open cap, stop engine, wait until ra-
diator is cool. Then loosen cap slowly to relieve the pressure.
Note: This procedure pertains to Caterpillar Diesel Engine Antifreeze/Coolant(DEAC) only. This does not pertain to machines that are shipped from thefactory with Extended Life Coolant(ELC). This does not pertain to machines that are maintained with Extended Life Coolant(ELC).
NOTICE
Do not change the coolant until you read and under-stand the material in the Cooling System Specifica-
tions section.
1.Empty the bucket.Remove the pin that secures the loader lift arm brace to the left loader lift arm.
Raise the loader arm to the maximum height.
2.Position the loader lift arm brace over the left lit cylinder rod with the flat end against the cylinder end.
3.Push the pin through the holes of the loader lift arm brace and install the cotter pin.
4.Slowly lower the loader arms until the loader lift arm brace contacts the top of the lift cylinder and the bosses on the loader arm.
Drain the coolant whenever the coolant is dirty or whenever foaming is observed.
The radiator cap is located under the access panel on the top of the engine compartment.
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1. Pull the hood release lever(1) in order to open the engine access door(2) on the top of the machine.
3.Pull the drain hose for the radiator through the hole under the radiator.
4. Remove the access panel on the left side of the engine compartment. The drain valve is located in an access port of the fan shroud. Open the drain valve. Allow the coolant to drain into a suitable container.
5. 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 in the solution should be between 6 percent and 10 percent.
6. Start the engine. Run the engine for 90 minutes.
Stop the engine. Drain the cleaning solution into a suitable container.
7. While the engine is stopped, flush the systemwith water. Flush the system until the draining water is transparent.
8. Close the drain valve.
9. Add the coolant solution. See the following topics:
· Operation and Maintenance Manual,"Cooling System Specifications"
· Operation and Maintenance Manual,"Refill Capacities"
Note: If you are using Caterpillar antifreeze, do not add the supplemental coolant additive at this time and/or change the element at this time.
10. Start the engine. Run the engine without the radiator cap until the thermostat opens and the coolant level stabilizes.
11. Maintain the coolant level within 13 mm(0.5 inch) of the bottom of the fller pipe.
12. Install the radiator cap. Replace the radiator cap if the gasket is damaged.
13. Stop the engine.
14. Replace the access panel. Close the access door.
