CB-634D Paving Compactor Caterpillar

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At operating temperature, the engine coolant is hot and under pressure. Steam can cause personal injury. Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand. Remove the fill cap slowly to relieve pressure. Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury.

Replace the water temperature regulator on a regular basis in order to reduce the chance of unscheduled downtime and the chance of problems with the cooling system.

The water temperature regulator should be replaced after the cooling system has been cleaned. Replace the water temperature regulator and replace the seals while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the water temperature regulator housing.

Note: If you are only replacing the water temperature regulator, drain the cooling system coolant to a level that is below the water temperature regulator housing.

In order to replace the water temperature regulator, the operator's platform must be tilted forward. Refer to the Operation and Maintenance Manual, "Platform Tilting" for more information.

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Illustration 1	g00851288

1. Loosen the hose clamp (4) and remove the hose (1) from the water temperature regulator housing (3).

2. Remove the bolts (2) from the water temperature regulator housing (3) and remove the water temperature regulator housing (3) .

3. Remove the gasket and remove the water temperature regulator from the water temperature regulator housing. Make a note of the orientation of the old regulator.

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NOTICE
Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a water temperature regulator. Depending on load, failure to operate with a water temperature regulator could result in either an overheating or an overcooling condition.

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NOTICE
If the water temperature regulator is installed incorrectly, it will cause the engine to overheat.

4. Install a new water temperature regulator. Install a new gasket. Install the water temperature regulator housing. Torque the bolts.

5. Install the hose. Tighten the hose clamp.

6. Add the cooling system coolant. Maintain the coolant level within 1 cm (0.5 inch) of the bottom of the filler tube. See the following topics:
   • Special Publication, SEBU6250, "Cooling System Specifications"

   • Operation and Maintenance Manual, "Refill Capacities"

7. Inspect pressure cap and the gasket for damage. Replace the pressure cap if the pressure cap or the gasket are damaged.

8. Install the pressure cap.

9. Lower the operator's platform. In order to lower the operator's platform, refer to the Operation and Maintenance Manual, "Platform Tilting"for more information.

See your Caterpillar Dealer for further information and instructions for your machine.