VII. SERVICE AND MAINTENANCE FLUIDS CONTINUED
Cooling System COOLANT TYPE - Your cooling system should always be sufficiently charged with an adequate mixture of antifreeze and water, regardless of the climate, in order to maintain a broad operating temperature range. Your cooling system has been factory-charged with an ethylene glycol-based antifreeze.
NOTE: Ethylene glycol-based antifreeze and propylene FIG 7.7
glycol-based antifreeze should never be mixed. CHECKING CONCENTRATION - The radiator cap is located immediately behind the rear of the operator’s station (fig. 7.7). 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 overheating and freezing. If a stronger antifreeze mixture is required, be sure not to exceed the engine manufacturer’s guidelines for antifreeze mixing. The table in figure 7.9 gives a few examples of ethylene glycol antifreeze/water mixture protection values. Consult the
FIG 7.8
engine manufacturer’s handbook for further information. Concentration should be checked every 500 hours or at the
Ethylene Glycol
beginning of each winter, whichever comes first. It should be checked using a refractometer; “floating ball”-type density
40%
-23ºC
-10ºF
testers or hydrometers are not accurate enough for use with heavy duty diesel cooling systems.
50%
-23ºC
-34ºF
60%
-23ºC
-65ºF FLUIDS CONTINUED
FIG 7.9
