Section 5
Section 5
Cooling SystemCooling System
Introduction.Introduction. The engine The engine cooling syscooling system coolstem cools
the the engine. engine. Refer Refer toto Section 9ASection 9Afor transmissionfor transmission
cooling system andcooling system and Section 15CSection 15Cfor the wet discfor the wet disc
brakes cooling system to find more detailed cool-brakes cooling system to find more detailed cool-
ing information on these particular systems.ing information on these particular systems.
Major ComponentsMajor Components (Illustrations 5-3 and 5-4)(Illustrations 5-3 and 5-4)..
The engine cooling system consists of coolant,The engine cooling system consists of coolant,
radiator / charge air cooler, recovery bottle, hosesradiator / charge air cooler, recovery bottle, hoses
connecting the radiator to the engine and a waterconnecting the radiator to the engine and a water
pump to circulate the coolant.pump to circulate the coolant.
OperationOperation(Illustration 5-4)(Illustration 5-4).. When the engine isWhen the engine is
started, the water pump draws coolant from thestarted, the water pump draws coolant from the
radiator into the radiator into the engine block. engine block. The coolant is The coolant is cir-cir-
culated through the engine and the coolant filterculated through the engine and the coolant filter
until it reaches a temperature of approximatelyuntil it reaches a temperature of approximately
190190
F (88F (88
C), at which point the thermostat willC), at which point the thermostat will
start to open. start to open. This will allow This will allow coolant flow back coolant flow back intointo
the top of the radiator core.the top of the radiator core.
Coolant.Coolant. The cooling system of this equipment isThe cooling system of this equipment is
protected to -34protected to -34
F (-36F (-36
C) and 228C) and 228
F (110F (110
C).C).
The solution is a 50 - 50 mixture of ethylene glycolThe solution is a 50 - 50 mixture of ethylene glycol
base antifreeze base antifreeze to water to water solution. solution. Use soft Use soft waterwater
in the cin the coolant mixture. oolant mixture. It is It is recommended thatrecommended that
50% solution be maintained year round.50% solution be maintained year round.
RadiatorRadiator (Illustration 5-3)(Illustration 5-3).. The radiator is force-The radiator is force-
air-cooled. air-cooled. Access to Access to its core its core is provided is provided throughthrough
a 16 psi (110 kPa) radiator cap located on top ofa 16 psi (110 kPa) radiator cap located on top of
the radiator.the radiator. When changing the coolant, refer toWhen changing the coolant, refer to
Draining / Flushing The Cooling SystemDraining / Flushing The Cooling Systemandand
Filling The Cooling SystemFilling The Cooling System..
Illustration Illustration 5-1. 5-1. Coolant Coolant LevelLevel
Servicing The Cooling SystemServicing The Cooling System
Severe injury may occur fromSevere injury may occur from
burns. burns. Radiator Radiator and and cap cap can can be be hot. hot. HeatedHeated
coolant can spraycoolant can spray. . Always shut Always shut down engindown enginee
and allow to cool before and allow to cool before attempting to openattempting to open
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