Cooling System M; Water Pump - Kubota Z400-B Handbuch

COOLING SYSTEM
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The cooling system consists of a radiator
(1)
(not included in
a basic model), a centrifugal water pump (4), a suction fan (2)
and a thermostat (3).
The water is cooled through the radiator core, and the fan
behind the radiator pulls the cooling air through the core to
improve cooling.
The water pump sucks the water from the radiator or from
the cylinder block and forces it into the crankcase.
The thermostat opens or closes according to the water
temperature, to allow the water to flow from the cylinder
block to the radiator while open, or only to the water pump
while closed.
Thermostat opening temperature
(1 ) Radiator
(2) Cooling Fan
(3)
Thermostat
(4) Water Pump
(5)
Cylinder Head
(6) Cylinder Block
[1] WATER PUMP
The water pump is driven by the crankshaft and a V belt.
The rotating impeller (4) in the water pump sucks the cooled
water from the radiator and sends it into the water jacket in
the crankcase.
The mechanical seal (3) prevents the water from entering the
bearing unit
(1).
(1) BearingUnit
(2) Water Pump Body
(3) Mechanical Seal
(4) Water Pump Impeller
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