Manitowoc Published 12-05-17, Control # 035-23 7-13
18000 SERIVCE/MAINTENANCE MANUAL POWER TRAIN
ENGINE COOLING SYSTEM
General
The cooling system consists of a vertically mounted radiator
in front of the engine with a hydraulically driven blower-type
fan.
Operation
Coolant Flow
The cooling system is of the de-aerated 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 pressure
rises to 15 psi (1,03 bar), the relief in the fill cap opens to
exhaust air through overflow line.
• De-aerated coolant returns to the system through a
make-up line.
FIGURE 7-10
Item Description Item Description
1 Engine 6 Vent Line
2 Water Pump Housing 7 Fill Cap
3 Thermostat Housing 8 Cooler Assembly
4 Bypass Line 9 Fan
5 Make up Line 10 Motor
MAIN FLOW
MAKE-UP FLOW
DEAERATION FLOW
Closed Thermostat Open Thermostat
cooler_flow_a
cooler_flow_b
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