Thermostat - Kubota D650-B Handbuch

I
(1)
00 76P008
[AI Flow of cooling water
0076F012
IB] Temperature sensor of wax pellet type thermostat
(111
(101
(9
lal
Ibl
3·2
THERMOSTAT
The thermostat maintains the cooling water at correct
temperature. KUBOTA's engine uses 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 temperatures (lower than 82°C (180°F)).
As the thermostat is closed, cooling water circulates in the
engine through water return pipe without running to the
radiator. Air in the water jacket in the engine escapes to
the radiator side through leak hole of the thermostat.
b) At high temperatures (higher than 82°C (180°F)).
When the temperature of cooling water exceeds 82°C
(180°F), wax in the pellet turns liquid and expands.
Because the spindle is fixed, the pellet is lowered, the
valve is separated from the sheet, and then cooling water
is sent to the radiator.
(11
Leak hole
(2)
Water cover
(31 Spindle
(4)
Pellet
(51
Valve
(61 Sheet
(7) To radiator
(8)
To engine
(91 Pellet
(10) Wax (liquid)
(11 ) Wax (solid)
a)
At low temperature
b) At high temperature
60