C-80
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
Cooling System
2. DESCRIPTION
1. The Cooling System is a closed type system which
permits operation at extreme angles without loss
of coolant through the overflow ripe and higher
engine coolant temperature without boiling.
NOTE: The use of radiator caps with pressure relief
valves allow the cooling system to operate at
higher pressures. Higher pressures raise the
boiling point of the coolant. The radiator cap
relief valve is set at 0.9 Kg/cm
2
(13 PSI)
For satisfactory operation of a closed Cooling
System, extra care must be taken to ensure that
all connections are water tight.
The Cooling Functions as follows :-
The Radiator forms the heart of the Cooling
System. The Coolant Water in the Radiator flows
down through tubes to Radiator bottom tank.
The Coolant is drawn from the bottom tank of
the Radiator by the Engine’s Water Pump which
delivers the Coolant to the Cylinder Block. As the
Coolant enter the Cylinder Block, it travels through
cored water passages in the Cylinder Block
absorbing the heat from the Cylinder Walls.
The Coolant then flows into the Cylinder Head
Water Jacket and to the Nozzle Tip Area. This flow
within the Cylinder head Water Jacket provides
sufficient Cooling at maximum temperature
Cooling Points. The Coolant continues to flow
through the Cylinder Head to the Thermostat.
The thermostat is located at the front of the
Cylinder Head in Thermostat Housing which is
outlet of Engine.
If the Thermostat is closed, a recirculating bypass
is provided, allowing a portion of the Coolant to
recirculate from the Cylinder Head to Cylinder
Block for faster warm up.
When the Thermostat is open, the hot Coolant
delivered from the outlet connection of the
Thermostat Manifold to the Top Tank of the
Radiator, the hot water from Top Tank passes
through the numerous tubes connected to the
bottom tank to be circulated in the continuous
process of Cooling. The tubes along with the fins
which are exposed to the Cooler Air Temperature.
The effect (Cooler Air) is increased by the draft
produced by the fan as well as the air stream
caused by the moving Tractor. This cycle is
repeated to keep the Engine at a desired optimum/
working temperature.
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