5 -11
Depending on the date of manufacture, your cooling system may be equipped with conventional
ethylene glycol coolant or an Organic Acid Technology (OAT) coolant solution. You can easily
identify OAT coolant solution by its yellow color. You should never mix the coolant types.
The coolant solution used must meet the manufacturer’s material specifications for either coolant
type. Refer to the chapter 5-3, “Lubricants and Capacity” in this manual.
NOTICE: NEVER mix OAT coolant with conventional coolant. Under no circumstances should you
top off a cooling system with only water. You can use a refractometer to check the concentration
level. You should not use Supplemental Coolant Additives (SCA) when using OAT coolant
solution. Change the coolant solution at the recommended change interval.
If you need to change a tractor from conventional coolant to OAT coolant or vice versa, you should
follow the “Changing coolant types” procedure below to attain the full benefit of the coolant.
Changing coolant types
To change coolant from OAT coolant to conventional coolant (or vice versa):
1. Empty the engine cooling system by draining the coolant into a suitable container.
2. Fill the system with clean water.
3. Start the engine and run the engine for at least 30 min.
NOTE: Make sure that you activate the heating system (if equipped) to circulate fluid through the
heater core.
4. Repeat Steps 1 to 3 for a total of two washes.
5. Fill the system with conventional coolant (or OAT coolant).
6. Operate the engine until it is warm. Inspect the tractor for leaks.
7. If you are changing to OAT coolant, then attach the decal to indicate the use of OAT coolant in the
cooling system.
Definitions
Conventional coolant:
A coolant that relies on inorganic inhibitors such as silicates, nitrites, and phosphates for corrosion
and cavitation protection.
Organic Acid Technology (OAT) coolant:
A coolant that relies on inhibitors such as organic acid salts for corrosion and cavitation protection.
(6) Change engine coolant to Organic Acid Technology (OAT)
coolant
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