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Maintenance Section
Coolant Information
NOTE : The following information is generic and
valid for lift trucks.
Engine operating temperatures have increased to
improve engine efficiency. This means proper cool-
ing system maintenance is especially important.
Overheating, overcooling, pitting, cavitation ero-
sion, cracked heads, piston seizures, and plugged
radiators are classic cooling system failures. In
fact, coolant is as important as the quality of fuel
and lubricating oil.
NOTICE
DAEWOO recommends that the coolant mix-
ture contain a minimum of 30% antifreeze or
equivalent.
Never add coolant to an overheated engine,
engine damage can result. Allow the engine to
cool first.
All water is corrosive at engine operating tem-
perature. The cooling system should be pro-
tected with a 3 to 6% concentration of liquid
supplemental coolant additive at all times,
regardless of the concentration of antifreeze.
Excessive supplemental coolant additive
greater than the recommended 6%, together
with concentrations of antifreeze greater than
65% can cause deposits to form and can result
in radiator tube blockage, overheating, and/or
water pump seal damage.
If the machine is to be stored in, or shipped to,
an area with freezing temperatures, the cooling
system must be protected to the lowest
expected outside (ambient) temperature.
The engine cooling system is normally protect-
ed to -28°C(-20°F) with antifreeze, when
shipped from the factory unless special
requirements are defined.
Check the specific gravity of the coolant solution
frequently in cold weather to ensure adequate pro-
tection.
Clean the cooling system if it is contaminated, if
the engine overheats or if foaming is observed in
the radiator.
Coolant should be drained, the system cleaned
and new coolant added every 2000 service hours
or two years.
Filling at over 20 liters (5 U.S. gallons) per minute
can cause air pockets in the cooling system.
After draining and refilling the cooling system,
operate the engine with the radiator cap removed
until the coolant reaches normal operating temper-
ature and the coolant level stabilizes. Add coolant
as necessary to fill the system to the proper level.
Never operate without a thermostat in the cooling
system. Cooling system problems can arise with-
out a thermostat.
Coolant Water
Hard water, or water with high levels of calcium
and magnesium ions, encourages the formation of
insoluble chemical compounds by combining with
cooling system additives such as silicates and
phosphates.
The tendency of silicates and phosphates to pre-
cipitate out-of-solution increases with increasing
water hardness. Hard water, or water with high
levels of calcium and magnesium ions encourages
the formation of insoluble chemicals, especially
after a number of heating and cooling cycles.
DAEWOO prefers the use of distilled water or
deionized water to reduce the potential and severi-
ty of chemical insolubilty.
Cooling System Specifications
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