24. SERVICE PROCEDURE 24.1.6 CLEANING THE SYSTEM At 6,000 hours or after two years of service, whichever comes first, clean the cooling system as follows: 1. Drain the system into a suitable container. Refer to “DRAINING THE SYSTEM”. 2. Drain and clean the reserve tank. 3. Close the radiator drain. REMARK: Be sure to close the cab heater water valves, if equipped, before any flushing compounds are circulated through the cooling system. This is to prevent particles of corrosion nor mally loosened by flushing compound, from plugging the small passages of the heater core. 4.
Fill the system with clean water, refer to “FILLING THE SYSTEM” and add a flushing compound that is compatible with aluminium. Flush the system in accordance with the instructions on the flushing compound 5. After flushing, rinsing and completely draining the system, open the cab heater water valves, if equipped. Refill with clean coolant. Refer to “FILLING THE SYSTEM”. 24.1.7 FILLING THE SYSTEM REMARK: Be sure to fill the heater and heater supply lines with fresh coolant, even if the heater is not in use (warm weather). Leaving the heater core empty causes corrosion in the heater. 1. Be sure the radiator drain valve is closed and tightened. Open the cab heater water valves, if equipped. 2 .
Fill the cooling system to maximum capacity. Fill with antifreeze and change the coolant filter. 3. For coolant specifications R SEE “20 COOLANT SYSTEM” on page 3-12. 4. Start engine and run until normal operating temperature is reached. Add coolant when needed to keep proper level in reserve tank. 5. After all air is removed and level remains fixed, install the radiator cap. 6. Fill the radiator reserve tank with coolant until level is between the FULL and LOW markings on the tank. PC450-ENG 3-30