Operation and maintenance manual

DX140R/DX140LCRInspection, Maintenance and Adjustment
4-8
Coolant and Water for Dilution
• The coolant has the important function of preventing
corrosion and preventing freezing.
Even in areas where freezing is not an
issue, use of
antifreeze coolant is essential.
DOOSAN machines are supplied with DOOSAN coolant.
DO
OSAN coolant has excellent anticorrosion, antifreeze
and cooling properties and can be used continuously for
1 year or 2,000 hours. Therefore, it is recommended to use
autho
rize
d genuine DOOSAN antifreeze solution.
When using DOOSAN coolant, there is no
need to use a
corrosion resistor. For details, see "Engine Cooling
System" on page 4-72.
• When diluting antifreeze coolant, use distilled water.
Na
tural water, such as a rive
r water or well water (hard
water), contains large amounts of minerals (calcium,
magnesium, etc.), and this makes it easier for scale to form
inside engine or radiator. Once scale is deposited inside
engine or radiator, it is extremely difficult to remove.
If tap water needs to be used, refer to "Engine Cooling
System" on page 4-72 for further information on standards
and precautions.
• When using antifreeze, always o
b
serve precautions given
in this manual.
• Antifreeze coolant is flammable, so be sure to keep it away
from a
ny flame.
• The ratio of DOOSAN coolant to water differs according to
am
bient temperature.
For details of ratio when mixing, see "Antifreeze
Concentration Tables" on page 4-74.
DOOSAN coolant may be supplied premixed. Never add
distill
ed water
.
• If engine overheats, wait for engine to cool before adding
cool
ant.
• If coolant level is low, it will cause overheating and
corr
osion problems because of air entering coolant.
• Never mix lime (hard water), salt or water contained metal
materi
al with coolant.