MAINTENANCE
7-42
G. COOLING SYSTEM
NOTE: When a new machine is shipped from the Hi-
tachi factory, the cooling system is filled with a
mixture of water and genuine Hitachi Long-Life
Coolant (LLC).
Coolant
Use fresh water which includes fewer impurities or nor-
mal tap water for the coolant. Avoid using strong acid or
alkaline water. Be sure to use genuine Hitachi long life
coolant (LLC).
Long Life Coolant (LLC)
LLC has two functions, antifreeze and anti-rust agent. As
a general rule, the ratio of antifreeze should range be-
tween 30% and 60%. If the ratio is below 30%, the sys-
tem may develop rust, and if it is above 60% the engine
may overheat.
NOTE: As for Borax Coolant, the mixed ratio, 50% is
recommended for anti-rust.
LLC Mixing Ratio
Mixing ratio % 30 35 40 45 50
Air temperature °C
(°F)
–10
(14)
–15
(5)
–20
(–4)
–25
(–13)
–30
(–22)
Precautions for Handling LLC
WARNING: LLC is poisonous.
1. If ingested, Induce vomiting and immediately get
emergency medical attention.
2. If antifreeze is accidentally splashed in the eyes, suf-
ficiently flush the eyes with water and get emergency
medical attention.
3. When storing antifreeze, be sure to keep it in a clearly
marked container with tight closing lid. Always keep
antifreeze out of the reach of children.
4. Keep open flame or sparks away from LLC.
5. When disposing LLC, comply with local regulations.
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