
SEBU7494-06 109
Maintenance Section
Cooling System Coolant (ELC) - Change
NOTICE
Mixing ELC with
other products will reduce the effec-
tiveness of the coolant.
This could resu
lt in damage to cooling system compo-
nents.
If Caterpilla
r products are not available and com-
mercial products must be used, make sure they
have passed the Caterpillar EC-1 specification for
pre-mixed or c
oncentrate coolants and Caterpillar
Extender.
Note: The machine was shipped from the factory with
Extended Lif
e Coolant (ELC) in the cooling system.
For information about the addition of Extender to your
cooling syst
em, see the Operation and Maintenance
Manual, “Cooling System Coolant (ELC) Extender -
Add” or consult your Caterpillar dealer.
Drain the coolant whenever the coolant is dirty or
whenever the coolant is foaming.
The radiator cap is located under the radiator guard
on the top of the engine compartment.
Allow the machine to cool before you change the
coolant.
1. Open the engine access door. Refer to Operation
and Maintenance Manual, “Access Doors and
Covers”.
2. Raise the radiator guard. Refer to Operation and
Maintenan
ce Manual, “Radiator Tilting”.
g00956151
Illustration 106
3. Slowly loosen the radiator cap in order to relieve
system pressure. Remove the radiator cap.
g00954319
Illustration 107
4. The drain plug for the coolant is located on the
left side of the engine block. Remove the drain
plug and allow the coolant to drain into a suitable
container.
5. Install the drain plug.
6. Replace the thermostat. See Operation and
Maintenance Manual, “Cooling System Water
Temperature Regulator - Replace” for the process
for replacing the thermostat.
7. Add the coolant solution. Refer to Operation and
Maintenance Manual, “Capacities - (Refill)”. Refer
to Special Publication, SEBU6250, “Caterpillar
Machine Fluids Recommendations”.
Note: Premix the coolant solution before filling
the cooling system. The coolant solution should
contain 50 percent coolant and 50 percent
distilled water.
Note: Add the coolant solution at a maximum rate
of five liters per minute. This will reduce the chance
of trapping air inside the engine block. A large amount
of trapped air can cause localized heating to occur
upon start-up. Localized heating may result in engine
damage, which may lead to failure of the engine.
8. Start the engine. Run the engine without the
radiator cap until the thermostat opens and the
coolant level stabilizes.