82410·
82710·
82910
WSM, 12271
(2) Thermostat
(A)
11790F10210
(B)
1 ENGINE
The thermostat maintains the cooling water at correct
temperature. KUBOTA's engine uses a wax pellet type
thermostat. Wax
is
enclosed
in
the pellet. The wax
is
solid
at
low temperatures, but turns liquid at high
temperatures, expands and opens the valve.
(A) At low temperature (lower than 82°C, 180
OF)
As
the thermostat
is
closed, cooling water circulates
in
the engine through the water return pipe without
running to the radiator.
Air
in
the water jacket escapes to the radiator side
through leak hole
(8)
of the thermostat.
(8)
At high temperature (higher than
82
°C,
180
OF)
When the temperature of cooling water exceeds
82°C
(180
OF),
wax
in
the pellet turns liquid and
expands. Because the spindle
(4)
is
fixed, the pellet
(3)
is
lowered, the valve
(2)
is separated from the seat (1),
and then cooling water is sent to the radiator.
The radiator core consists of water carrying tubes
(2)
with fins
(3)
at a right angle to
it.
The water
in
the radiator
is
cooled
by
the air flowing
through between the tube wall and the fin.
The louverless corrugated fins are light
in
weight,
high
in
heat exchange ratio and less
in
clogging by the
dust.
(3) Radiator
11790F10220
3
(1) Seat
(2) Valve
(3) Pellet
(4) Spindle
(5) Synthetic Rubber
(1) Cooling Air
(2) Tube
1-M11
(6) Wax (Solid)
(7) Spring
(8) Leak Hole
(9) Wax (Liquid)
(3) Fin
11790M10181
11790M10190
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