How to Change Cooling System Coolant (ELC)for Caterpillar 72H

Here is an instruction show you guide on how to change cooling system coolant for Caterpillar 72H pipelayer.

Preparations:

CAT ET 2022A Diagnostic Software

CAT 3 317-7485 Adapter


Procedures:
Drain the coolant whenever the coolant is dirty or whenever foaming is observed.
The filler cap is located inside the access door in the top, right side of the radiator guard.
1. Slowly loosen the filler cap in order to relieve system pressure. Remove the filler cap.

 

2. Use Tooling (A) and a suitable block to support the front bottom guard.
Note: The front bottom guard weighs 75 kg (165 lb).
3. Remove nuts (1) and the washers.
4. Remove bolts (2) and the washers. Lower Tooling (A) and remove the front bottom guard from the machine.
5. Direct the hose on the drain valve (pipe) into a suitable container.
6. Open the drain valve. Allow the coolant to drain into a suitable container.
7. 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.
8. Start the engine. Run the engine for 90 minutes.
Stop the engine. Drain the cleaning solution into a suitable container.
9. While the engine is stopped, flush the system with water. Flush the system until the draining water is clear.
10. Close the drain valve

11. Use Tooling (A) and a suitable block to install the front bottom guard.
12. Install the front bottom guard on the machine with the four bolts (2), the washers, and nuts.
Tighten nuts (1) to 370  50 N·m (273  37 lb ft).
13. Add the coolant solution. See the following topic in this publication:
• Capacities (Refill)
Note: Caterpillar antifreeze contains additive. 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.
14. Start the engine. Run the engine without the filler cap until the thermostat opens and the coolant level stabilizes.

15. Open the left engine access door. Check the coolant level. Make necessary adjustments to the coolant level. Fill the coolant level to the top of the sight glass, as shown.
16. If the gasket is damaged, replace the filler cap.Install the filler cap.
17. Stop the engine.

18. Clean the radiator cores with compressed air.You may need to use water in order to remove debris.
19. Close the left engine access door

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