Cooling System; Check Coolant Level; Clean Radiator Core; Clean Intercooler Core - Hitachi EX1900-5 Operator's Manual

G. COOLING SYSTEM
Parts

Check Coolant Level

1. Coolant
Change Coolant
2. Clean Radiator

3. Clean Radiator Core

4. Clean Intercooler Core

NOTE: ✱ Before leaving the Hitachi factory, the cooling system is filled with a mixture of water and Genuine
Hitachi Long-Life Coolant. As long as Genuine Hitachi Long-Life Coolant is used, the service inter-
vals between changing the coolant is once every two years, or every 4000 hours, whichever comes
first.
Coolant
Fill the radiator with soft, pure tap or bottled water.
Anti-rust agent
Add approximately 3.9 L (4.1 US qt) of anti-rust agent to
the new coolant when the coolant is changed.
It is not necessary to add anti-rust agent when antifreeze
is used.
Antifreeze
If the air temperature is expected to fall below 0°C (32°F),
fill the cooling system with an antifreeze and soft water
mix. As a general rule, the ratio of antifreeze should
range between 30% and 50% as shown in the table be-
low. If the ratio is below 30%, the system may develop
rust, and if it is above 50%, the engine may overheat.
MAINTENANCE
Quantity
1
195 L (51.5 US gal)
1
1
2
7-76
Interval (hours)
10 50 250 500 1000 1500 2000
Twice a year, in spring and autumn ✱
When changing coolant