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Maintenance Section
Maintenance Section
Cooling System Specifications
Cooling System Specifications
Coolant Information
Coolant Information
NOTE:
NOTE:
The following information is generic and
The following information is generic and
valid for lift trucks.
valid for lift trucks.
Engine operating temperatures have increased to
Engine operating temperatures have increased to
improve engine efficiency. This means proper
improve engine efficiency. This means proper
cooling system maintenance is
cooling system maintenance is especially important.
especially important.
Overheating, overcooling, pitting,
Overheating, overcooling, pitting, cavitation erosion,
cavitation erosion,
cracked heads, piston seizures, and plugged
cracked heads, piston seizures, and plugged
radiators are classic cooling system failures. In fact,
radiators are classic cooling system failures. In fact,
coolant is as important as the quality of fuel and
coolant is as important as the quality of fuel and
lubricating oil.
lubricating oil.
NOTICE
NOTICE
DOOSAN recommends that the coolant mixture
DOOSAN recommends that the coolant mixture
contain 50% commercially available automotive
contain 50% commercially available automotive
antifreeze, and 50% water.
antifreeze, and 50% water.
The coolant mix with concentration of antifreeze
The coolant mix with concentration of antifreeze
smaller than 30% does not provide sufficient
smaller than 30% does not provide sufficient
corrosion protection. Concentrations over 60%
corrosion protection. Concentrations over 60%
adversely affect freeze protection and heat transfer
adversely affect freeze protection and heat transfer
rates.
rates.
Never add coolant to an overheated engine, engine
Never add coolant to an overheated engine, engine
damage can result. Allow the engine to cool first.
damage can result. Allow the engine to cool first.
If the machine is to be stored in, or shipped to, an
If the machine is to be stored in, or shipped to, an
area with freezing temperatures, the cooling system
area with freezing temperatures, the cooling system
must be protected to the lowest expected outside
must be protected to the lowest expected outside
(ambient) temperature.
(ambient) temperature.
The engine cooling system is normally protected to
The engine cooling system is normally protected to
-28
-28
°
°C
C
(-20
(-20
°
°F
F
) with antifreeze, when shipped from
) with antifreeze, when shipped from
the factory unless special requirements are
the factory unless special requirements are defined.
defined.
Check the specific gravity of the coolant solution
Check the specific gravity of the coolant solution
frequently in cold weather to ensure adequate
frequently in cold weather to ensure adequate
protection.
protection.
Clean the cooling system if it is contaminated, the
Clean the cooling system if it is contaminated, the
engine overheats or foaming is observed in the
engine overheats or foaming is observed in the
radiator.
radiator.
Old coolant should be drained, the system cleaned
Old coolant should be drained, the system cleaned
and new coolant added every 2000 service hours
and new coolant added every 2000 service hours
or yearly.
or yearly.
Refer to topic, “Cooling System - Clean, Change” in
Refer to topic, “Cooling System - Clean, Change” in
Every 2000 Service Hours or Yearly se
Every 2000 Service Hours or Yearly section.
ction.
Filling at over 20 liters (5 U.S. gallons) per minute
Filling at over 20 liters (5 U.S. gallons) per minute
can cause air pockets i
can cause air pockets in the cooling system.
n the cooling system.
After draining and refilling the cooling system,
After draining and refilling the cooling system,
operate the engine with the radiator cap removed
operate the engine with the radiator cap removed
until the coolant reaches normal operating
until the coolant reaches normal operating
temperature and the coolant level stabilizes. Add
temperature and the coolant level stabilizes. Add
coolant as necessary to fill the system to
coolant as necessary to fill the system to the proper
the proper
level.
level.
Never operate without a thermostat in the cooling
Never operate without a thermostat in the cooling
system. Cooling system problems can arise without
system. Cooling system problems can arise without
a thermostat.
a thermostat.
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