7-65
Use fresh water or normal tap water as a coolant. Do not use
strong acid or alkaline water. Use the coolant with genuine
Hitachi Long-Life Coolant (LLC) mixed by 30 to 50 %.
If the air temperature is expected to fall below 0°C (32°F), fill
the cooling system with an genuine Hitachi Long-Life Cool
-
ant (LLC) and soft water mix. As a general rule, the ratio of
LLC should range between 30% and 50% as shown in the
table below. If the ratio is below 30%, the system may de-
velop rust, and if it is above 50%, the engine may overheat.
1. Close vent valve (5) by turning it clockwise.
2. Open plug (4) and drain valve (3). Drain fuel from the filter.
LLC Mixing Table
Air
temperature
°C
Mixing
ratio
%
ZW220 ZW250
Coolant Capacity: 38.0 liter Coolant Capacity: 41.0 liter
LLC (liter) Soft Water
(liter)
LLC (liter) Soft Water
(liter)
-1 30 11.4 26.6 12.3 28.7
-4 30 11.4 26.6 12.3 28.7
-7 30 11.4 26.6 12.3 28.7
-11 30 11.4 26.6 12.3 28.7
-15 35 13.3 24.7 14.35 26.65
-20 40 15.2 22.8 16.4 24.6
-25 45 17.1 20.9 18.45 22.55
-30 50 19.0 19.0 20.5 20.5
Air
temperature
°C
ZW180 ZW310
Coolant Capacity: 26.0 liter Coolant Capacity: 59.0 liter
LLC (liter) Soft Water
(liter)
LLC (liter) Soft Water
(liter)
-1
13.0 13.0 29.5 29.5
-4
-7
-11
-15
-20
-25
-30