928G Wheel Loader Caterpillar

Replace the thermostat on a regular basis in order to reduce the chance of unscheduled downtime and of problems with the cooling system. Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.

The thermostat should be replaced after the cooling system has been cleaned. Replace the thermostat while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the thermostat housing.

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

Caterpillar engines incorporate a shunt design cooling system. It is mandatory to always operate the engine with a thermostat.

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1. Loosen the hose clamp and remove the hose from the thermostat housing assembly.

2. Remove the bolts from the thermostat housing assembly. Remove the thermostat housing assembly.

3. Remove the gasket, the thermostat, and the seal from the thermostat housing assembly.

4. Install a new seal in the thermostat housing assembly. Install a new thermostat and a new gasket. Install the thermostat housing assembly on the engine cylinder head.

   The thermostats can be reused under the following conditions.

   • The thermostat is tested and the thermostat meets test specifications.

   • The thermostat is not damaged.

   • The thermostat does not have excessive buildup of deposits.

5. Install the hose. Tighten the hose clamp.

6. Refill the cooling system. See Operation and Maintenance Manual, "Cooling System Specifications" and Operation and Maintenance Manual, "Refill Capacities".