POWER TRAIN 2250 SERVICE/MAINTENANCE MANUAL
7-8
Published 07-19-16, Control # 249-01
ENGINE COOLING SYSTEM FILL
General
The cooling system consists of a horizontal radiator
(mounted above the engine) and two variable-speed,
hydraulically driven, blower-type fans.
Cooling System Operation
Cooling system flow is illustrated in Figure 7-5.
The cooling system is of the deaeration type, which
continually removes air from the system, as follows:
• A small percentage of total coolant flow is circulated
through a vent line to the radiator.
• Since coolant circulation is very slow in the radiator, air
separates from the coolant.
• Air collects at the top of the radiator. When the pressure
rises to 1 bar (16 psi), a relief in the fill cap opens to
exhaust air through the overflow line.
• Deaerated coolant returns to the system through a
make-up line.
WARNING
Poison Hazard!
Prevent personal injury. Coolant is toxic to humans,
animals, and the environment. Ingestion of coolant could
cause serious injury or death.
If not reused, dispose of coolant in accordance with all
local and other applicable environmental regulations.
FIGURE 7-5
Item Description
1 Engine
2 Water Pump Housing
3 Thermostat Housing
4 Bypass Line
5 Make-up Line
6 Vent Line
7 Fill Cap
8Cooler Assembly
9 Fan (qty 2)
10 Motor (qty 2)
Main Flow
Make-up Flow
Deaeration FlowDeaeration FlowDeaeration FlowDeaeration Flow
Closed Thermostat
Open Thermostat
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