VII. SERVICE AND MAINTENANCE

Cooling System

COOLANT TYPE - Your cooling system should always be sufficiently charged with an adequate mixture of an tifreeze and water, regardless of the climate, in order to maint ain a broad operating temperature range. Your cooling system ha s been factory-charged with an ethylene glycol-based antif reeze.

NOTE:

Ethylene glycol-based antifreeze and propylene glyc ol -based antifreeze should never be mixed.

CHECKING CONCENTRATION - The radiator cap is located immediately behind the rear of the operator’s stati on (fig. 7.6). Never remove a cap from a hot engine. Always allow the engine to cool before servicing cooling system.

A 50/50 antifreeze/water mixture is a conservative mixture which allows good protection against both overheati ng and freezing. The table in figure 7.8 gives a few examples of ethylene glycol antifreeze/water mixture protection values.

Ethylene Glycol

40% -23ºC -10ºF

Concentration should be checked every 500 hours or at the beginning of each winter, whichever comes first. It should be checked using a refractometer; “floating ball”-type density testers or hydrometers are not accurate enough for use with heavy duty diesel cooling systems.

50% -37ºC -34ºF

60% -54ºC -65ºF

CHECKING FLUID LEVEL - The coolant level should be checked daily while the engine is cold. This should be done at the same time that the overflow is checked. If you do not see fluid in the neck of the radiator then fluid must b e added. Be sure that if you are adding anti-freeze that it is ethylene glycolbased. DO NOT mix with propylene glycol-based antifreeze.