Hitachi ZW 310-6 Operator's Manual page 359

7. Start the engine and wait for one minute, then run at
slightly higher than the low idle speed for about 30
minutes until the water temperature reaches above
85ºC (185ºF).
Take care of the water level especially for the first
5 minutes, and add water via sub tank cap (4) as
needed.
IMPORTANT: The water temperature must be kept at
85ºC (185ºF) of higher during flushing to open the
thermostat in order to circulate the water within
the radiator.
8. Let the engine cool down naturally with the engine
shut "OFF".
9. Stop the engine and loosen drain plug (2) to drain
the cooling system. Tighten drain plug (2).
10. Repeat flushing steps 5 through 9 above until the
water is clean.
11. Tighten drain plug (2) and fill the system with the
premixed coolant by taking steps 5 and 6.
f
NOTE: Refer to page 7-71 for the mixing instruction.
12. Start the engine and wait for one minute, then run at
slightly higher than the low idle speed for about 30
minutes until the coolant temperature reaches above
85ºC (185ºF).
Let the engine cool down naturally with the engine
shut "OFF".
13. Wait until the engine has cooled.
Check the coolant level and add if necessary.
14. Add coolant additive via sub tank cap (4).
f
NOTE: Refer to page 7-71 for the coolant additive.
15. Replace the DCA4 coolant filter.
Refer to page 7-74 for the procedure.
16. Reinstall sub tank cap (4).
MAINTENANCE
7-81
4
2
90Z7B-7-78-2
90Z7B-7-78-1