Hitachi ZAXIS 450LC-3 Operator's Manual page 352

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2. Remove the radiator cap. Open drain cocks (1) and (2)

on the radiator and engine block to allow the coolant to

drain completely.

3. Close drain cocks (1) and (2). Fill the radiator with tap

water and a radiator cleaner agent. Start the engine and

run at a speed slightly higher than slow idle; when the

needle of the temperature gauge reaches the green

zone, run the engine for about ten more minutes.

4. Stop the engine and open drain cock (1). Flush out the

cooling system with tap water, until draining water is

clear. This helps remove rust and sediment.

5. Close drain cock (1). Fill the radiator with tap water and

an anti-rust agent or antifreeze at the specified mixing

ratio. When adding coolant, do so slowly to avoid mixing

air bubbles in the system.

6. Run the engine to sufficiently bleed the air from the

cooling system.

7. After adding coolant, operate the engine for several

minutes. Check the coolant level again, and add coolant

if necessary.

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