Cub Cadet 8404 - Manual (Page 35)

ENGINE SYSTEM
2-13 D615-W02 May-2003
615W223A
615W224A
2.3 COOLING SYSTEM
B. WATER PUMP
The water pump is driven with the fan drive pulley, which
is on the water pump shaft and driven by the crankshaft
with a belt. The water pump sucks the cooled water,
forces into the cylinder block and draws out the hot
water to the radiator repeatedly. The mechanical seal
(3) prevents the water from entering the bearing (1).
A. FLOW OF COOLING WATER
The cooling system consists of a radiator (5), a cen-
trifugal water pump (7), a cooling fan (6) and a thermo-
stat (2). The water is cooled as it flows through the
radiator core, and the fan behind the radiator pulls the
cooling air through the radiator core. The water pump
receives water from the radiator or from the cylinder
head and forces it into cylinder block. The thermostat
open or closes according to the water temperature.
When the water temperature is high, the thermostat
opens to allow the water to flow from the cylinder block
to the radiator. When the water temperature is low, the
thermostat closes and the flow stays within the block.
The opening temperature of the thermostat is approx.
71 °C (160 °F).
(1) Water Return Pipe
(2) Thermostat
(3) Cylinder Head Water Jacket
(4) Cylinder Block Water Jacket
(5) Radiator
(6) Cooling Fan
(7) Water Pump
(a) From the Thermostat
(b) To the Cylinder Block
(c) From the Radiator
(1) Bearing (3) Mechanical Seal
(2) Pump Body (4) Pump Impeller