MAINTENANCE OF THE HEMTT - OD1662 - LESSON 1/TASK 1
(c) Cooling System (figure 19 on the previous page).
The pressure
type cooling system protects the engine by removing heat generated
during the combustion process. Pressure within the cooling system is
regulated by a pressure release in the radiator filler cap (1). The
hot coolant flows from the engine to the top of the radiator tank (2)
and through the radiator core (3) where a stream of air removes heat.
This stream of air is drawn through the core by an air-activated fan
(4).
A water pump (5) draws the coolant from the bottom of the
radiator and pushes it through the engine, repeating the cooling
process. Thermostats (6) mounted in each coolant outlet elbow remain
closed until the coolant approaches a predetermined temperature, at
which time they open.
When the coolant temperature drops below the
thermostat rating, they close.
An air vent line (7) between the
radiator and the water pump inlet removes air trapped in the engine
when the cooling system is being filled.
FIGURE 20.
ELECTRICAL SYSTEM.
(3) Electrical System (figure 20). The voltage and current for the
electrical system are indicated by a battery gage (1) and an ammeter
(2) located on the dash panel inside the driver's compartment.
Circuit breakers (3) located in the cab protect the main circuits.
Electrical power is provided by four 12-volt series-parallel connected
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